Vulnerability in Cisco Adaptive Security Appliance (ASA) Software (CVE-2023-20247)
Summary
Vulnerability in Cisco Adaptive Security Appliance (ASA) Software (CVE-2023-20247). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
A vulnerability in the remote access SSL VPN feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to bypass a configured multiple certificate authentication policy and connect using only a valid username and password. This vulnerability is due to improper error handling during remote access VPN authentication. An attacker could exploit this vulnerability by sending crafted requests during remote access VPN session establishment. A successful exploit could allow the attacker to bypass the configured multiple certificate authentication policy while retaining the privileges and permissions associated with the original connection profile.
Source: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2023-20247 has been found in Cisco Adaptive Security Appliance (ASA) Software.
Risk of unauthorized operations or information disclosure. CVSS score: 5.0/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Cisco Adaptive Security Appliance (ASA) Software CVE-2023-20247" on the vendor's site.
CVE-2023-20247 (Cisco Adaptive Security Appliance (ASA) Software) — CWE-288 / CVSS v3 5.0
Attack vector: remote (network-reachable) / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-288) exists in Cisco Adaptive Security Appliance (ASA) Software.
Check the vendor advisory for the affected versions of Cisco Adaptive Security Appliance (ASA) Software.
Severity: Medium (CVSS 5.0/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Cisco Adaptive Security Appliance (ASA) Software を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- patch sec.cloudapps.cisco.com