CVE-2026-20009 (GCVE-0-2026-20009)

Vulnerability from cvelistv5 – Published: 2026-03-04 17:06 – Updated: 2026-03-05 15:49
VLAI?
Title
Cisco Secure Firewall Adaptive Security Appliance SSH Partial Private Key Authentication Bypass Vulnerability
Summary
A vulnerability in the implementation of the proprietary SSH stack with SSH key-based authentication in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to log in to a Cisco Secure Firewall ASA device and execute commands as a specific user. This vulnerability is due to insufficient validation of user input during the SSH authentication phase. An attacker could exploit this vulnerability by submitting crafted input during SSH authentication to an affected device. A successful exploit could allow the attacker to log in to the device as a specific user without the private SSH key of that user. To exploit this vulnerability, the attacker must possess a valid username and the associated public key. The private key is not required. Notes: Exploitation of this vulnerability does not provide the attacker with root access. The authentication, authorization, and accounting (AAA) configuration command auto-enable is not affected by this vulnerability.  
CWE
  • CWE-138 - Improper Neutralization of Special Elements
Assigner
Impacted products
Vendor Product Version
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software Affected: 9.17.1
Affected: 9.17.1.7
Affected: 9.17.1.9
Affected: 9.17.1.10
Affected: 9.18.1
Affected: 9.18.1.3
Affected: 9.17.1.11
Affected: 9.18.2
Affected: 9.17.1.13
Affected: 9.17.1.15
Affected: 9.18.2.5
Affected: 9.17.1.20
Affected: 9.18.2.7
Affected: 9.19.1
Affected: 9.18.2.8
Affected: 9.18.3
Affected: 9.19.1.5
Affected: 9.17.1.30
Affected: 9.19.1.9
Affected: 9.18.3.39
Affected: 9.19.1.12
Affected: 9.18.3.46
Affected: 9.19.1.18
Affected: 9.18.3.53
Affected: 9.18.3.55
Affected: 9.17.1.33
Affected: 9.18.3.56
Affected: 9.20.1
Affected: 9.19.1.22
Affected: 9.18.4
Affected: 9.20.1.5
Affected: 9.18.4.5
Affected: 9.19.1.24
Affected: 9.18.4.8
Affected: 9.20.2
Affected: 9.19.1.27
Affected: 9.18.4.22
Affected: 9.20.2.10
Affected: 9.19.1.28
Affected: 9.17.1.39
Affected: 9.18.4.24
Affected: 9.20.2.21
Affected: 9.19.1.31
Affected: 9.18.4.29
Affected: 9.20.2.22
Affected: 9.18.4.34
Affected: 9.20.3
Affected: 9.18.4.40
Affected: 9.23.1
Affected: 9.22.1.1
Affected: 9.20.3.4
Affected: 9.18.4.47
Affected: 9.20.3.7
Affected: 9.17.1.45
Affected: 9.19.1.37
Affected: 9.17.1.46
Affected: 9.20.3.9
Affected: 9.19.1.38
Affected: 9.18.4.50
Affected: 9.22.1.3
Affected: 9.20.3.10
Affected: 9.22.1.2
Affected: 9.18.4.52
Affected: 9.20.3.13
Affected: 9.22.1.6
Affected: 9.18.4.53
Affected: 9.22.2
Affected: 9.20.3.16
Affected: 9.19.1.42
Affected: 9.18.4.57
Affected: 9.23.1.3
Affected: 9.20.3.20
Affected: 9.22.2.4
Affected: 9.23.1.7
Affected: 9.20.4
Affected: 9.22.2.9
Affected: 9.23.1.13
Affected: 9.20.4.7
Affected: 9.22.2.13
Affected: 9.18.4.66
Affected: 9.18.4.67
Affected: 9.18.4.68
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{\"status\": \"affected\", \"version\": \"9.18.4\"}, {\"status\": \"affected\", \"version\": \"9.20.1.5\"}, {\"status\": \"affected\", \"version\": \"9.18.4.5\"}, {\"status\": \"affected\", \"version\": \"9.19.1.24\"}, {\"status\": \"affected\", \"version\": \"9.18.4.8\"}, {\"status\": \"affected\", \"version\": \"9.20.2\"}, {\"status\": \"affected\", \"version\": \"9.19.1.27\"}, {\"status\": \"affected\", \"version\": \"9.18.4.22\"}, {\"status\": \"affected\", \"version\": \"9.20.2.10\"}, {\"status\": \"affected\", \"version\": \"9.19.1.28\"}, {\"status\": \"affected\", \"version\": \"9.17.1.39\"}, {\"status\": \"affected\", \"version\": \"9.18.4.24\"}, {\"status\": \"affected\", \"version\": \"9.20.2.21\"}, {\"status\": \"affected\", \"version\": \"9.19.1.31\"}, {\"status\": \"affected\", \"version\": \"9.18.4.29\"}, {\"status\": \"affected\", \"version\": \"9.20.2.22\"}, {\"status\": \"affected\", \"version\": \"9.18.4.34\"}, {\"status\": \"affected\", \"version\": \"9.20.3\"}, {\"status\": \"affected\", \"version\": \"9.18.4.40\"}, {\"status\": \"affected\", \"version\": \"9.23.1\"}, {\"status\": \"affected\", \"version\": \"9.22.1.1\"}, {\"status\": \"affected\", \"version\": \"9.20.3.4\"}, {\"status\": \"affected\", \"version\": \"9.18.4.47\"}, {\"status\": \"affected\", \"version\": \"9.20.3.7\"}, {\"status\": \"affected\", \"version\": \"9.17.1.45\"}, {\"status\": \"affected\", \"version\": \"9.19.1.37\"}, {\"status\": \"affected\", \"version\": \"9.17.1.46\"}, {\"status\": \"affected\", \"version\": \"9.20.3.9\"}, {\"status\": \"affected\", \"version\": \"9.19.1.38\"}, {\"status\": \"affected\", \"version\": \"9.18.4.50\"}, {\"status\": \"affected\", \"version\": \"9.22.1.3\"}, {\"status\": \"affected\", \"version\": \"9.20.3.10\"}, {\"status\": \"affected\", \"version\": \"9.22.1.2\"}, {\"status\": \"affected\", \"version\": \"9.18.4.52\"}, {\"status\": \"affected\", \"version\": \"9.20.3.13\"}, {\"status\": \"affected\", \"version\": \"9.22.1.6\"}, {\"status\": \"affected\", \"version\": \"9.18.4.53\"}, {\"status\": \"affected\", \"version\": \"9.22.2\"}, {\"status\": \"affected\", \"version\": \"9.20.3.16\"}, {\"status\": \"affected\", \"version\": \"9.19.1.42\"}, {\"status\": \"affected\", \"version\": \"9.18.4.57\"}, {\"status\": \"affected\", \"version\": \"9.23.1.3\"}, {\"status\": \"affected\", \"version\": \"9.20.3.20\"}, {\"status\": \"affected\", \"version\": \"9.22.2.4\"}, {\"status\": \"affected\", \"version\": \"9.23.1.7\"}, {\"status\": \"affected\", \"version\": \"9.20.4\"}, {\"status\": \"affected\", \"version\": \"9.22.2.9\"}, {\"status\": \"affected\", \"version\": \"9.23.1.13\"}, {\"status\": \"affected\", \"version\": \"9.20.4.7\"}, {\"status\": \"affected\", \"version\": \"9.22.2.13\"}, {\"status\": \"affected\", \"version\": \"9.18.4.66\"}, {\"status\": \"affected\", \"version\": \"9.18.4.67\"}, {\"status\": \"affected\", \"version\": \"9.18.4.68\"}], \"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-asa-ssh-keybypass-cr5xPUSf\", \"name\": \"cisco-sa-asa-ssh-keybypass-cr5xPUSf\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the implementation of the proprietary SSH stack with SSH key-based authentication in Cisco Secure Firewall Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to log in to a Cisco Secure Firewall ASA device and execute commands as a specific user.\\r\\n\\r\\nThis vulnerability is due to insufficient validation of user input during the SSH authentication phase. An attacker could exploit this vulnerability by submitting crafted input during SSH authentication to an affected device. A successful exploit could allow the attacker to log in to the device as a specific user without the private SSH key of that user. To exploit this vulnerability, the attacker must possess a valid username and the associated public key. The private key is not required.\\r\\nNotes:\\r\\n\\r\\nExploitation of this vulnerability does not provide the attacker with root access.\\r\\nThe authentication, authorization, and accounting (AAA) configuration command auto-enable is not affected by this vulnerability.\u0026nbsp;\u0026nbsp;\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-138\", \"description\": \"Improper Neutralization of Special Elements\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-03-04T17:06:58.606Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-20009\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-05T15:49:42.424Z\", \"dateReserved\": \"2025-10-08T11:59:15.350Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-03-04T17:06:58.606Z\", \"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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