CVE-2026-20039 (GCVE-0-2026-20039)
Vulnerability from cvelistv5
Published
2026-03-04 17:17
Modified
2026-03-05 15:49
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-244 - Improper Clearing of Heap Memory Before Release ('Heap Inspection')
Summary
A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to ineffective memory management of the VPN web server. An attacker could exploit this vulnerability by sending a large number of crafted HTTP requests to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Cisco | Cisco Secure Firewall Adaptive Security Appliance (ASA) Software |
Version: 9.12.3 Version: 9.12.1 Version: 9.12.2 Version: 9.12.4 Version: 9.12.3.2 Version: 9.12.3.7 Version: 9.12.2.5 Version: 9.12.3.12 Version: 9.12.1.3 Version: 9.12.2.4 Version: 9.12.1.2 Version: 9.12.2.9 Version: 9.12.3.9 Version: 9.12.2.1 Version: 9.12.4.2 Version: 9.12.4.4 Version: 9.12.4.7 Version: 9.12.4.8 Version: 9.12.4.10 Version: 9.12.4.13 Version: 9.12.4.18 Version: 9.12.4.24 Version: 9.16.1 Version: 9.12.4.26 Version: 9.16.1.28 Version: 9.12.4.29 Version: 9.16.2 Version: 9.12.4.30 Version: 9.16.2.3 Version: 9.12.4.35 Version: 9.16.2.7 Version: 9.12.4.37 Version: 9.17.1 Version: 9.16.2.11 Version: 9.16.2.13 Version: 9.12.4.39 Version: 9.12.4.38 Version: 9.16.2.14 Version: 9.17.1.7 Version: 9.12.4.40 Version: 9.16.3.3 Version: 9.16.3 Version: 9.16.3.14 Version: 9.17.1.9 Version: 9.12.4.41 Version: 9.17.1.10 Version: 9.18.1 Version: 9.12.4.47 Version: 9.16.3.15 Version: 9.18.1.3 Version: 9.17.1.11 Version: 9.12.4.48 Version: 9.18.2 Version: 9.16.3.19 Version: 9.17.1.13 Version: 9.12.4.50 Version: 9.17.1.15 Version: 9.12.4.52 Version: 9.16.3.23 Version: 9.18.2.5 Version: 9.16.4 Version: 9.12.4.54 Version: 9.17.1.20 Version: 9.18.2.7 Version: 9.19.1 Version: 9.16.4.9 Version: 9.12.4.55 Version: 9.18.2.8 Version: 9.16.4.14 Version: 9.18.3 Version: 9.19.1.5 Version: 9.12.4.56 Version: 9.17.1.30 Version: 9.19.1.9 Version: 9.18.3.39 Version: 9.16.4.19 Version: 9.12.4.58 Version: 9.19.1.12 Version: 9.18.3.46 Version: 9.16.4.27 Version: 9.19.1.18 Version: 9.18.3.53 Version: 9.18.3.55 Version: 9.16.4.38 Version: 9.17.1.33 Version: 9.12.4.62 Version: 9.16.4.39 Version: 9.18.3.56 Version: 9.20.1 Version: 9.16.4.42 Version: 9.19.1.22 Version: 9.18.4 Version: 9.20.1.5 Version: 9.18.4.5 Version: 9.19.1.24 Version: 9.16.4.48 Version: 9.18.4.8 Version: 9.20.2 Version: 9.19.1.27 Version: 9.12.4.65 Version: 9.16.4.55 Version: 9.18.4.22 Version: 9.20.2.10 Version: 9.16.4.57 Version: 9.19.1.28 Version: 9.17.1.39 Version: 9.12.4.67 Version: 9.18.4.24 Version: 9.20.2.21 Version: 9.16.4.61 Version: 9.19.1.31 Version: 9.18.4.29 Version: 9.20.2.22 Version: 9.16.4.62 Version: 9.18.4.34 Version: 9.20.3 Version: 9.16.4.67 Version: 9.16.4.70 Version: 9.18.4.40 Version: 9.23.1 Version: 9.22.1.1 Version: 9.16.4.71 Version: 9.20.3.4 Version: 9.18.4.47 Version: 9.20.3.7 Version: 9.17.1.45 Version: 9.19.1.37 Version: 9.17.1.46 Version: 9.16.4.76 Version: 9.20.3.9 Version: 9.19.1.38 Version: 9.18.4.50 Version: 9.22.1.3 Version: 9.20.3.10 Version: 9.22.1.2 Version: 9.18.4.52 Version: 9.20.3.13 Version: 9.22.1.6 Version: 9.18.4.53 Version: 9.16.4.82 Version: 9.22.2 Version: 9.19.1.42 |
|||||||
|
|||||||||
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"descriptions": [
{
"lang": "en",
"value": "A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to ineffective memory management of the VPN web server. An attacker could exploit this vulnerability by sending a large number of\u0026nbsp;crafted HTTP requests to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition."
}
],
"exploits": [
{
"lang": "en",
"value": "The Cisco Product Security Incident Response Team (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": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
"version": "3.1"
},
"format": "cvssV3_1"
}
],
"problemTypes": [
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"cweId": "CWE-244",
"description": "Improper Clearing of Heap Memory Before Release (\u0027Heap Inspection\u0027)",
"lang": "en",
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}
]
}
],
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},
"references": [
{
"name": "cisco-sa-asaftd-vpn-dos-SpOFF2Re",
"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-SpOFF2Re"
}
],
"source": {
"advisory": "cisco-sa-asaftd-vpn-dos-SpOFF2Re",
"defects": [
"CSCwo01785"
],
"discovery": "INTERNAL"
},
"title": "Cisco Adaptive Security Appliance and Firepower Threat Defense Software SSL VPN Authentication Denial of Service Vulnerability"
}
},
"cveMetadata": {
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"cveId": "CVE-2026-20039",
"datePublished": "2026-03-04T17:17:49.841Z",
"dateReserved": "2025-10-08T11:59:15.354Z",
"dateUpdated": "2026-03-05T15:49:08.973Z",
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},
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"vulnerability-lookup:meta": {
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\"affected\", \"version\": \"7.0.8.1\"}, {\"status\": \"affected\", \"version\": \"7.4.2.4\"}], \"defaultStatus\": \"unknown\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco Product Security Incident Response Team (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-asaftd-vpn-dos-SpOFF2Re\", \"name\": \"cisco-sa-asaftd-vpn-dos-SpOFF2Re\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\\r\\n\\r\\nThis vulnerability is due to ineffective memory management of the VPN web server. An attacker could exploit this vulnerability by sending a large number of\u0026nbsp;crafted HTTP requests to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-244\", \"description\": \"Improper Clearing of Heap Memory Before Release (\u0027Heap Inspection\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-03-04T17:17:49.841Z\"}}}",
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"dataType": "CVE_RECORD",
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}
}
}
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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.
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