CVE-2026-20103 (GCVE-0-2026-20103)
Vulnerability from cvelistv5 – Published: 2026-03-04 17:19 – Updated: 2026-03-04 21:36
VLAI?
Summary
A vulnerability in the Remote Access SSL VPN functionality of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to exhaust device memory resulting in a denial of service (DoS) condition to new Remote Access SSL VPN connections. This does not affect the management interface, though it may become temporarily unresponsive.
This vulnerability is due to trusting user input without validation. An attacker could exploit this vulnerability by sending crafted packets to the Remote Access SSL VPN server. A successful exploit could allow the attacker to cause the device web interface to stop responding, resulting in a DoS condition.
Severity ?
8.6 (High)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Cisco | Cisco Secure Firewall Adaptive Security Appliance (ASA) Software |
Affected:
9.12.4.48
Affected: 9.12.4.50 Affected: 9.12.4.52 Affected: 9.12.4.54 Affected: 9.12.4.55 Affected: 9.12.4.56 Affected: 9.12.4.58 Affected: 9.12.4.62 Affected: 9.12.4.65 Affected: 9.12.4.67 Affected: 9.16.3.15 Affected: 9.16.3.19 Affected: 9.16.3.23 Affected: 9.16.4 Affected: 9.16.4.9 Affected: 9.16.4.14 Affected: 9.16.4.19 Affected: 9.16.4.27 Affected: 9.16.4.38 Affected: 9.16.4.39 Affected: 9.16.4.42 Affected: 9.16.4.48 Affected: 9.16.4.55 Affected: 9.16.4.57 Affected: 9.16.4.61 Affected: 9.16.4.62 Affected: 9.16.4.67 Affected: 9.16.4.70 Affected: 9.16.4.71 Affected: 9.16.4.76 Affected: 9.16.4.82 Affected: 9.16.4.84 Affected: 9.17.1.20 Affected: 9.17.1.30 Affected: 9.17.1.33 Affected: 9.17.1.39 Affected: 9.17.1.45 Affected: 9.17.1.46 Affected: 9.18.1.3 Affected: 9.18.2 Affected: 9.18.2.5 Affected: 9.18.2.7 Affected: 9.18.2.8 Affected: 9.18.3 Affected: 9.18.3.39 Affected: 9.18.3.46 Affected: 9.18.3.53 Affected: 9.18.3.55 Affected: 9.18.3.56 Affected: 9.18.4 Affected: 9.18.4.5 Affected: 9.18.4.8 Affected: 9.18.4.22 Affected: 9.18.4.24 Affected: 9.18.4.29 Affected: 9.18.4.34 Affected: 9.18.4.40 Affected: 9.18.4.47 Affected: 9.18.4.50 Affected: 9.18.4.52 Affected: 9.18.4.53 Affected: 9.18.4.57 Affected: 9.19.1 Affected: 9.19.1.5 Affected: 9.19.1.9 Affected: 9.19.1.12 Affected: 9.19.1.18 Affected: 9.19.1.22 Affected: 9.19.1.24 Affected: 9.19.1.27 Affected: 9.19.1.28 Affected: 9.19.1.31 Affected: 9.19.1.37 Affected: 9.19.1.38 Affected: 9.19.1.42 Affected: 9.20.1 Affected: 9.20.1.5 Affected: 9.20.2 Affected: 9.20.2.10 Affected: 9.20.2.21 Affected: 9.20.2.22 Affected: 9.20.3 Affected: 9.20.3.4 Affected: 9.20.3.7 Affected: 9.20.3.9 Affected: 9.20.3.10 Affected: 9.20.3.13 Affected: 9.20.3.16 Affected: 9.20.3.20 Affected: 9.22.1.1 Affected: 9.22.1.3 Affected: 9.22.1.2 Affected: 9.22.1.6 Affected: 9.22.2 Affected: 9.22.2.4 Affected: 9.23.1 Affected: 9.23.1.3 |
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\"version\": \"9.16.4\"}, {\"status\": \"affected\", \"version\": \"9.16.4.9\"}, {\"status\": \"affected\", \"version\": \"9.16.4.14\"}, {\"status\": \"affected\", \"version\": \"9.16.4.19\"}, {\"status\": \"affected\", \"version\": \"9.16.4.27\"}, {\"status\": \"affected\", \"version\": \"9.16.4.38\"}, {\"status\": \"affected\", \"version\": \"9.16.4.39\"}, {\"status\": \"affected\", \"version\": \"9.16.4.42\"}, {\"status\": \"affected\", \"version\": \"9.16.4.48\"}, {\"status\": \"affected\", \"version\": \"9.16.4.55\"}, {\"status\": \"affected\", \"version\": \"9.16.4.57\"}, {\"status\": \"affected\", \"version\": \"9.16.4.61\"}, {\"status\": \"affected\", \"version\": \"9.16.4.62\"}, {\"status\": \"affected\", \"version\": \"9.16.4.67\"}, {\"status\": \"affected\", \"version\": \"9.16.4.70\"}, {\"status\": \"affected\", \"version\": \"9.16.4.71\"}, {\"status\": \"affected\", \"version\": \"9.16.4.76\"}, {\"status\": \"affected\", \"version\": \"9.16.4.82\"}, {\"status\": \"affected\", \"version\": \"9.16.4.84\"}, {\"status\": \"affected\", \"version\": \"9.17.1.20\"}, {\"status\": \"affected\", \"version\": \"9.17.1.30\"}, {\"status\": \"affected\", \"version\": \"9.17.1.33\"}, {\"status\": \"affected\", \"version\": \"9.17.1.39\"}, {\"status\": \"affected\", \"version\": \"9.17.1.45\"}, {\"status\": \"affected\", \"version\": \"9.17.1.46\"}, {\"status\": \"affected\", \"version\": \"9.18.1.3\"}, {\"status\": \"affected\", \"version\": \"9.18.2\"}, {\"status\": \"affected\", \"version\": \"9.18.2.5\"}, {\"status\": \"affected\", \"version\": \"9.18.2.7\"}, {\"status\": \"affected\", \"version\": \"9.18.2.8\"}, {\"status\": \"affected\", \"version\": \"9.18.3\"}, {\"status\": \"affected\", \"version\": \"9.18.3.39\"}, {\"status\": \"affected\", \"version\": \"9.18.3.46\"}, {\"status\": \"affected\", \"version\": \"9.18.3.53\"}, {\"status\": \"affected\", \"version\": \"9.18.3.55\"}, {\"status\": \"affected\", \"version\": \"9.18.3.56\"}, {\"status\": \"affected\", \"version\": \"9.18.4\"}, {\"status\": \"affected\", \"version\": \"9.18.4.5\"}, {\"status\": \"affected\", \"version\": \"9.18.4.8\"}, {\"status\": \"affected\", \"version\": \"9.18.4.22\"}, {\"status\": \"affected\", \"version\": \"9.18.4.24\"}, {\"status\": \"affected\", \"version\": \"9.18.4.29\"}, {\"status\": \"affected\", \"version\": \"9.18.4.34\"}, {\"status\": \"affected\", \"version\": \"9.18.4.40\"}, {\"status\": \"affected\", \"version\": \"9.18.4.47\"}, {\"status\": \"affected\", \"version\": \"9.18.4.50\"}, {\"status\": \"affected\", \"version\": \"9.18.4.52\"}, {\"status\": \"affected\", \"version\": \"9.18.4.53\"}, {\"status\": \"affected\", \"version\": \"9.18.4.57\"}, {\"status\": \"affected\", \"version\": \"9.19.1\"}, {\"status\": \"affected\", \"version\": \"9.19.1.5\"}, {\"status\": \"affected\", \"version\": \"9.19.1.9\"}, {\"status\": \"affected\", \"version\": \"9.19.1.12\"}, {\"status\": \"affected\", \"version\": \"9.19.1.18\"}, {\"status\": \"affected\", \"version\": \"9.19.1.22\"}, {\"status\": \"affected\", \"version\": \"9.19.1.24\"}, {\"status\": \"affected\", \"version\": \"9.19.1.27\"}, {\"status\": \"affected\", \"version\": \"9.19.1.28\"}, {\"status\": \"affected\", \"version\": \"9.19.1.31\"}, {\"status\": \"affected\", \"version\": \"9.19.1.37\"}, {\"status\": \"affected\", \"version\": \"9.19.1.38\"}, {\"status\": \"affected\", \"version\": \"9.19.1.42\"}, {\"status\": \"affected\", \"version\": \"9.20.1\"}, {\"status\": \"affected\", \"version\": \"9.20.1.5\"}, {\"status\": \"affected\", \"version\": \"9.20.2\"}, {\"status\": \"affected\", \"version\": \"9.20.2.10\"}, {\"status\": \"affected\", \"version\": \"9.20.2.21\"}, {\"status\": \"affected\", \"version\": \"9.20.2.22\"}, {\"status\": \"affected\", \"version\": \"9.20.3\"}, {\"status\": \"affected\", \"version\": \"9.20.3.4\"}, {\"status\": \"affected\", \"version\": \"9.20.3.7\"}, {\"status\": \"affected\", \"version\": \"9.20.3.9\"}, {\"status\": \"affected\", \"version\": \"9.20.3.10\"}, {\"status\": \"affected\", \"version\": \"9.20.3.13\"}, {\"status\": \"affected\", \"version\": \"9.20.3.16\"}, {\"status\": \"affected\", \"version\": \"9.20.3.20\"}, {\"status\": \"affected\", \"version\": \"9.22.1.1\"}, {\"status\": \"affected\", \"version\": \"9.22.1.3\"}, {\"status\": \"affected\", \"version\": \"9.22.1.2\"}, {\"status\": \"affected\", \"version\": \"9.22.1.6\"}, {\"status\": \"affected\", \"version\": \"9.22.2\"}, {\"status\": \"affected\", \"version\": \"9.22.2.4\"}, {\"status\": \"affected\", \"version\": \"9.23.1\"}, {\"status\": \"affected\", \"version\": \"9.23.1.3\"}]}, {\"vendor\": \"Cisco\", \"product\": \"Cisco Secure Firewall Threat Defense (FTD) Software\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.4.0.16\"}, {\"status\": \"affected\", \"version\": \"6.4.0.17\"}, {\"status\": \"affected\", \"version\": \"6.4.0.18\"}, {\"status\": \"affected\", \"version\": \"7.0.4\"}, {\"status\": \"affected\", \"version\": \"7.0.5\"}, {\"status\": \"affected\", \"version\": \"7.0.6\"}, {\"status\": \"affected\", \"version\": \"7.0.6.1\"}, {\"status\": \"affected\", \"version\": \"7.0.6.2\"}, {\"status\": \"affected\", \"version\": \"7.0.6.3\"}, {\"status\": \"affected\", \"version\": \"7.0.7\"}, {\"status\": \"affected\", \"version\": \"7.0.8\"}, {\"status\": \"affected\", \"version\": \"7.0.8.1\"}, {\"status\": \"affected\", \"version\": \"7.1.0.3\"}, {\"status\": \"affected\", \"version\": \"7.2.1\"}, {\"status\": \"affected\", \"version\": \"7.2.2\"}, {\"status\": \"affected\", \"version\": \"7.2.3\"}, {\"status\": \"affected\", \"version\": \"7.2.4\"}, {\"status\": \"affected\", \"version\": \"7.2.4.1\"}, {\"status\": \"affected\", \"version\": \"7.2.5\"}, {\"status\": \"affected\", \"version\": \"7.2.5.1\"}, {\"status\": \"affected\", \"version\": \"7.2.6\"}, {\"status\": \"affected\", \"version\": \"7.2.7\"}, {\"status\": \"affected\", \"version\": \"7.2.5.2\"}, {\"status\": \"affected\", \"version\": \"7.2.8\"}, {\"status\": \"affected\", \"version\": \"7.2.8.1\"}, {\"status\": \"affected\", \"version\": \"7.2.9\"}, {\"status\": \"affected\", \"version\": \"7.2.10\"}, {\"status\": \"affected\", \"version\": \"7.2.10.2\"}, {\"status\": \"affected\", \"version\": \"7.3.0\"}, {\"status\": \"affected\", \"version\": \"7.3.1\"}, {\"status\": \"affected\", \"version\": \"7.3.1.1\"}, {\"status\": \"affected\", \"version\": \"7.3.1.2\"}, {\"status\": \"affected\", \"version\": \"7.4.0\"}, {\"status\": \"affected\", \"version\": \"7.4.1\"}, {\"status\": \"affected\", \"version\": \"7.4.1.1\"}, {\"status\": \"affected\", \"version\": \"7.4.2\"}, {\"status\": \"affected\", \"version\": \"7.4.2.1\"}, {\"status\": \"affected\", \"version\": \"7.4.2.2\"}, {\"status\": \"affected\", \"version\": \"7.4.2.3\"}, {\"status\": \"affected\", \"version\": \"7.4.2.4\"}, {\"status\": \"affected\", \"version\": \"7.6.0\"}, {\"status\": \"affected\", \"version\": \"7.6.1\"}, {\"status\": \"affected\", \"version\": \"7.6.2\"}, {\"status\": \"affected\", \"version\": \"7.6.2.1\"}, {\"status\": \"affected\", \"version\": \"7.7.0\"}, {\"status\": \"affected\", \"version\": \"7.7.10\"}, {\"status\": \"affected\", \"version\": \"7.7.10.1\"}]}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-m9sx6MbC\", \"name\": \"cisco-sa-asaftd-vpn-m9sx6MbC\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the Remote Access SSL VPN functionality of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to exhaust device memory resulting in a denial of service (DoS) condition to new Remote Access SSL VPN connections. This does not affect the management interface, though it may become temporarily unresponsive. \\r\\n\\r This vulnerability is due to trusting user input without validation. An attacker could exploit this vulnerability by sending crafted packets to the Remote Access SSL VPN server. A successful exploit could allow the attacker to cause the device web interface to stop responding, resulting in a DoS condition.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-770\", \"description\": \"Allocation of Resources Without Limits or Throttling\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-03-04T17:19:36.377Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-20103\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-04T21:36:10.914Z\", \"dateReserved\": \"2025-10-08T11:59:15.371Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-03-04T17:19:36.377Z\", \"assignerShortName\": \"cisco\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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