CVE-2026-20161 (GCVE-0-2026-20161)
Vulnerability from cvelistv5
Published
2026-04-15 16:03
Modified
2026-04-15 16:56
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Summary
A vulnerability in the CLI of Cisco ThousandEyes Enterprise Agent could allow an authenticated, local attacker with low privileges to overwrite arbitrary files on the local system of an affected device.
This vulnerability is due to improper access controls on files that are on the local file system of an affected device. An attacker could exploit this vulnerability by placing a symbolic link in a specific location on the local file system. A successful exploit could allow the attacker to bypass file system permissions and overwrite arbitrary files on the affected device.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Cisco | Cisco ThousandEyes Enterprise Agent |
Version: Agent 5.0 Version: Agent 4.4.4 Version: Agent 4.4.3 Version: Agent 4.4.2 Version: Agent 4.2 Version: Agent 4.1 Version: Agent 4.0 Version: Agent 5.1 Version: Agent 5.1.2 |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-20161",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-15T16:54:35.119090Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-15T16:56:35.191Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "Cisco ThousandEyes Enterprise Agent",
"vendor": "Cisco",
"versions": [
{
"status": "affected",
"version": "Agent 5.0"
},
{
"status": "affected",
"version": "Agent 4.4.4"
},
{
"status": "affected",
"version": "Agent 4.4.3"
},
{
"status": "affected",
"version": "Agent 4.4.2"
},
{
"status": "affected",
"version": "Agent 4.2"
},
{
"status": "affected",
"version": "Agent 4.1"
},
{
"status": "affected",
"version": "Agent 4.0"
},
{
"status": "affected",
"version": "Agent 5.1"
},
{
"status": "affected",
"version": "Agent 5.1.2"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the CLI of Cisco ThousandEyes Enterprise Agent could allow an authenticated, local attacker with low privileges to overwrite arbitrary files on the local system of an affected device.\r\n\r\nThis vulnerability is due to improper access controls on files that are on the local file system\u0026nbsp;of an affected device. An attacker could exploit this vulnerability by placing a symbolic link in a specific location on the local file system. A successful exploit could allow the attacker to bypass file system permissions and overwrite arbitrary files on the affected device."
}
],
"exploits": [
{
"lang": "en",
"value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-59",
"description": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
"lang": "en",
"type": "cwe"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-15T16:03:43.769Z",
"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"shortName": "cisco"
},
"references": [
{
"name": "cisco-sa-te-agentfilewrite-tqUw3SMU",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-te-agentfilewrite-tqUw3SMU"
}
],
"source": {
"advisory": "cisco-sa-te-agentfilewrite-tqUw3SMU",
"defects": [
"CSCwt14485"
],
"discovery": "INTERNAL"
},
"title": "Cisco ThousandEyes Enterprise Agent Arbitrary File Overwrite Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
"assignerShortName": "cisco",
"cveId": "CVE-2026-20161",
"datePublished": "2026-04-15T16:03:43.769Z",
"dateReserved": "2025-10-08T11:59:15.388Z",
"dateUpdated": "2026-04-15T16:56:35.191Z",
"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-2026-20161\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-15T16:54:35.119090Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-15T16:56:26.618Z\"}}], \"cna\": {\"title\": \"Cisco ThousandEyes Enterprise Agent Arbitrary File Overwrite Vulnerability\", \"source\": {\"defects\": [\"CSCwt14485\"], \"advisory\": \"cisco-sa-te-agentfilewrite-tqUw3SMU\", \"discovery\": \"INTERNAL\"}, \"metrics\": [{\"format\": \"cvssV3_1\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"Cisco\", \"product\": \"Cisco ThousandEyes Enterprise Agent\", \"versions\": [{\"status\": \"affected\", \"version\": \"Agent 5.0\"}, {\"status\": \"affected\", \"version\": \"Agent 4.4.4\"}, {\"status\": \"affected\", \"version\": \"Agent 4.4.3\"}, {\"status\": \"affected\", \"version\": \"Agent 4.4.2\"}, {\"status\": \"affected\", \"version\": \"Agent 4.2\"}, {\"status\": \"affected\", \"version\": \"Agent 4.1\"}, {\"status\": \"affected\", \"version\": \"Agent 4.0\"}, {\"status\": \"affected\", \"version\": \"Agent 5.1\"}, {\"status\": \"affected\", \"version\": \"Agent 5.1.2\"}], \"defaultStatus\": \"unknown\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-te-agentfilewrite-tqUw3SMU\", \"name\": \"cisco-sa-te-agentfilewrite-tqUw3SMU\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the CLI of Cisco ThousandEyes Enterprise Agent could allow an authenticated, local attacker with low privileges to overwrite arbitrary files on the local system of an affected device.\\r\\n\\r\\nThis vulnerability is due to improper access controls on files that are on the local file system\u0026nbsp;of an affected device. An attacker could exploit this vulnerability by placing a symbolic link in a specific location on the local file system. A successful exploit could allow the attacker to bypass file system permissions and overwrite arbitrary files on the affected device.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-59\", \"description\": \"Improper Link Resolution Before File Access (\u0027Link Following\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-04-15T16:03:43.769Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-20161\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-15T16:56:35.191Z\", \"dateReserved\": \"2025-10-08T11:59:15.388Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-04-15T16:03:43.769Z\", \"assignerShortName\": \"cisco\"}",
"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…