CVE-2026-71920 (GCVE-0-2026-71920)
Vulnerability from cvelistv5
Published
2026-08-24 17:07
Modified
2026-08-24 18:17
Severity ?
6.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
4.9 (Medium) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
4.9 (Medium) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
VLAI Severity ?
EPSS score ?
CWE
- CWE-476 - NULL Pointer Dereference
Summary
Multiple DrayTek VigorSwitch models contain a null pointer dereference vulnerability in the formlogout function. The vulnerability is caused by missing checks for an empty or absent Cookie header before string handling. A remote attacker can trigger this vulnerability via a crafted request to crash the service and cause a denial of service. Exploitation requires valid administrative credentials for the device's web management interface.
References
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-71920",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-24T18:17:16.143303Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-24T18:17:24.678Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "VigorSwitch G2540xs",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "3.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch P2540xs",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "3.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch FX2120",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "3.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch G2282x",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.10.6",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch P2282x",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.10.6",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch Q2300x",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.10.7",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch PQ2300xb",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.10.7",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch G2542x",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "3.10.6",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch P2542x",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "3.10.6",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch P2542xh",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "3.10.6",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch PX2060",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch G1280",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch P1280",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch P1281x",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch G1282",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch P1282",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch G2121",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch P2121",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch PQ2121x",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch Q2121x",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch G2280x",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch P2280x",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch Q2200x",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch PQ2200xb",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch G2100",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch P2100",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch G2540x",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"product": "VigorSwitch P2540x",
"vendor": "DrayTek Corporation",
"versions": [
{
"lessThan": "2.9.10",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:draytek:vigorswitch_g2540xs_firmware:*:*:*:*:*:*:*:*",
"versionEndExcluding": "3.9.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:draytek:vigorswitch_p2540xs_firmware:*:*:*:*:*:*:*:*",
"versionEndExcluding": "3.9.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:draytek:vigorswitch_fx2120_firmware:*:*:*:*:*:*:*:*",
"versionEndExcluding": "3.9.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:draytek:vigorswitch_g1282_firmware:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.9.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:draytek:vigorswitch_p1282_firmware:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.9.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:draytek:vigorswitch_g2121_firmware:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.9.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:draytek:vigorswitch_pq2121x_firmware:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.9.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:draytek:vigorswitch_q2121x_firmware:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.9.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:draytek:vigorswitch_g2280x_firmware:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.9.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:draytek:vigorswitch_p2280x_firmware:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.9.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:draytek:vigorswitch_q2200x_firmware:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.9.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:draytek:vigorswitch_pq2200xb_firmware:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.9.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:draytek:vigorswitch_g2100_firmware:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.9.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:draytek:vigorswitch_p2100_firmware:*:*:*:*:*:*:*:*",
"versionEndExcluding": "2.9.10",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jincheng Wang (@winmt)"
},
{
"lang": "en",
"type": "finder",
"value": "Le Yu (Nanjing University of Posts and Telecommunications)"
},
{
"lang": "en",
"type": "finder",
"value": "Xiapu Luo (The Hong Kong Polytechnic University)"
}
],
"datePublic": "2026-08-24T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "Multiple DrayTek VigorSwitch models contain a null pointer dereference vulnerability in the formlogout function. The vulnerability is caused by missing checks for an empty or absent Cookie header before string handling. A remote attacker can trigger this vulnerability via a crafted request to crash the service and cause a denial of service. Exploitation requires valid administrative credentials for the device\u0027s web management interface."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"privilegesRequired": "HIGH",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
},
"format": "CVSS"
},
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 4.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-476",
"description": "NULL Pointer Dereference",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-24T17:07:50.273Z",
"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"shortName": "VulnCheck"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/"
},
{
"name": "VulnCheck Advisory: DrayTek VigorSwitch Multiple Models NULL Pointer Dereference via formlogout",
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-null-pointer-dereference-via-formlogout"
}
],
"title": "DrayTek VigorSwitch Multiple Models NULL Pointer Dereference via formlogout",
"x_generator": {
"engine": "vulncheck-endgame"
}
}
},
"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"assignerShortName": "VulnCheck",
"cveId": "CVE-2026-71920",
"datePublished": "2026-08-24T17:07:50.273Z",
"dateReserved": "2026-08-08T16:37:44.518Z",
"dateUpdated": "2026-08-24T18:17:24.678Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-71920\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-24T18:17:16.143303Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-24T18:17:19.907Z\"}}], \"cna\": {\"title\": \"DrayTek VigorSwitch Multiple Models NULL Pointer Dereference via formlogout\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Jincheng Wang (@winmt)\"}, {\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Le Yu (Nanjing University of Posts and Telecommunications)\"}, {\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Xiapu Luo (The Hong Kong Polytechnic University)\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 6.9, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"HIGH\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\"}}, {\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 4.9, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"HIGH\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch G2540xs\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"3.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch P2540xs\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"3.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch FX2120\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"3.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch G2282x\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.10.6\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch P2282x\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.10.6\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch Q2300x\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.10.7\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch PQ2300xb\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.10.7\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch G2542x\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"3.10.6\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch P2542x\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"3.10.6\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch P2542xh\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"3.10.6\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch PX2060\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch G1280\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch P1280\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch P1281x\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch G1282\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch P1282\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch G2121\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch P2121\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch PQ2121x\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch Q2121x\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch G2280x\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch P2280x\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch Q2200x\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch PQ2200xb\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch G2100\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch P2100\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch G2540x\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"DrayTek Corporation\", \"product\": \"VigorSwitch P2540x\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.9.10\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}], \"datePublic\": \"2026-08-24T00:00:00.000Z\", \"references\": [{\"url\": \"https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-null-pointer-dereference-via-formlogout\", \"name\": \"VulnCheck Advisory: DrayTek VigorSwitch Multiple Models NULL Pointer Dereference via formlogout\", \"tags\": [\"third-party-advisory\"]}], \"x_generator\": {\"engine\": \"vulncheck-endgame\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Multiple DrayTek VigorSwitch models contain a null pointer dereference vulnerability in the formlogout function. The vulnerability is caused by missing checks for an empty or absent Cookie header before string handling. A remote attacker can trigger this vulnerability via a crafted request to crash the service and cause a denial of service. Exploitation requires valid administrative credentials for the device\u0027s web management interface.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"NULL Pointer Dereference\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:draytek:vigorswitch_g2540xs_firmware:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"3.9.10\"}, {\"criteria\": \"cpe:2.3:o:draytek:vigorswitch_p2540xs_firmware:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"3.9.10\"}, {\"criteria\": \"cpe:2.3:o:draytek:vigorswitch_fx2120_firmware:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"3.9.10\"}, {\"criteria\": \"cpe:2.3:o:draytek:vigorswitch_g1282_firmware:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.9.10\"}, {\"criteria\": \"cpe:2.3:o:draytek:vigorswitch_p1282_firmware:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.9.10\"}, {\"criteria\": \"cpe:2.3:o:draytek:vigorswitch_g2121_firmware:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.9.10\"}, {\"criteria\": \"cpe:2.3:o:draytek:vigorswitch_pq2121x_firmware:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.9.10\"}, {\"criteria\": \"cpe:2.3:o:draytek:vigorswitch_q2121x_firmware:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.9.10\"}, {\"criteria\": \"cpe:2.3:o:draytek:vigorswitch_g2280x_firmware:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.9.10\"}, {\"criteria\": \"cpe:2.3:o:draytek:vigorswitch_p2280x_firmware:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.9.10\"}, {\"criteria\": \"cpe:2.3:o:draytek:vigorswitch_q2200x_firmware:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.9.10\"}, {\"criteria\": \"cpe:2.3:o:draytek:vigorswitch_pq2200xb_firmware:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.9.10\"}, {\"criteria\": \"cpe:2.3:o:draytek:vigorswitch_g2100_firmware:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.9.10\"}, {\"criteria\": \"cpe:2.3:o:draytek:vigorswitch_p2100_firmware:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"2.9.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"83251b91-4cc7-4094-a5c7-464a1b83ea10\", \"shortName\": \"VulnCheck\", \"dateUpdated\": \"2026-08-24T17:07:50.273Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-71920\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-24T18:17:24.678Z\", \"dateReserved\": \"2026-08-08T16:37:44.518Z\", \"assignerOrgId\": \"83251b91-4cc7-4094-a5c7-464a1b83ea10\", \"datePublished\": \"2026-08-24T17:07:50.273Z\", \"assignerShortName\": \"VulnCheck\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…