--- id: "CVE-2025-20362" kind: "vulnerability" aliases: ["CVE-2025-20362"] title: "Update: On November 5, 2025, Cisco became aware of a new attack variant against devices running Cisco Secure ASA\u2026" severity: "critical" cvss: 8.6 epss: null exploited: true status: "open" category: "infrastructure" products: [{"name": "Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "cisco adaptive security appliance software", "fixed": ["9.12.4.72"], "affected": ">= 9.12, < 9.12.4.72", "ecosystem": "vendor"}, {"name": "cisco adaptive security appliance software", "fixed": ["9.14.4.28"], "affected": ">= 9.14, < 9.14.4.28", "ecosystem": "vendor"}, {"name": "cisco adaptive security appliance software", "fixed": ["9.16.4.85"], "affected": ">= 9.16, < 9.16.4.85", "ecosystem": "vendor"}, {"name": "cisco adaptive security appliance software", "fixed": ["9.18.4.67"], "affected": ">= 9.17.0, < 9.18.4.67", "ecosystem": "vendor"}, {"name": "cisco adaptive security appliance software", "fixed": ["9.20.4.10"], "affected": ">= 9.19, < 9.20.4.10", "ecosystem": "vendor"}, {"name": "cisco adaptive security appliance software", "fixed": ["9.22.2.14"], "affected": ">= 9.22, < 9.22.2.14", "ecosystem": "vendor"}, {"name": "cisco adaptive security appliance software", "fixed": ["9.23.1.19"], "affected": ">= 9.23, < 9.23.1.19", "ecosystem": "vendor"}, {"name": "cisco secure firewall threat defense", "fixed": ["7.0.8.1"], "affected": ">= 7.0.0, < 7.0.8.1", "ecosystem": "vendor"}, {"name": "cisco secure firewall threat defense", "fixed": ["7.2.10.2"], "affected": ">= 7.1.0, < 7.2.10.2", "ecosystem": "vendor"}, {"name": "cisco secure firewall threat defense", "fixed": ["7.4.2.4"], "affected": ">= 7.3.0, < 7.4.2.4", "ecosystem": "vendor"}, {"name": "cisco secure firewall threat defense", "fixed": ["7.6.2.1"], "affected": ">= 7.6.0, < 7.6.2.1", "ecosystem": "vendor"}, {"name": "cisco secure firewall threat defense", "fixed": ["7.7.10.1"], "affected": ">= 7.7.0, < 7.7.10.1", "ecosystem": "vendor"}] ecosystems: ["vendor"] tags: ["asa", "cisco", "exploited", "firewall", "ftd", "infrastructure", "vpn"] not_affected_if: ["no-vpn-web-server-enabled"] published_at: "2025-09-25T00:00:00+00:00" first_seen_at: "2026-10-23T19:11:51+00:00" updated_at: "2026-10-23T23:44:51+00:00" sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-20362", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-20362", "first_seen_at": "2026-10-23T23:44:51+00:00"}] --- # Update: On November 5, 2025, Cisco became aware of a new attack variant against devices running Cisco Secure ASA… A missing authorization check in the VPN web server of Cisco ASA and Firewall Threat Defense (FTD) software lets a remote party reach functions they should not. Per the sources it can be chained with CVE-2025-20333, and it is listed as actively exploited in the wild. _Summary, check and fix written by a model from the sources; labelled as such._ ## Affected - vendor:Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense affected ? fixed ? - vendor:cisco adaptive security appliance software affected >= 9.12, < 9.12.4.72 fixed 9.12.4.72 - vendor:cisco adaptive security appliance software affected >= 9.14, < 9.14.4.28 fixed 9.14.4.28 - vendor:cisco adaptive security appliance software affected >= 9.16, < 9.16.4.85 fixed 9.16.4.85 - vendor:cisco adaptive security appliance software affected >= 9.17.0, < 9.18.4.67 fixed 9.18.4.67 - vendor:cisco adaptive security appliance software affected >= 9.19, < 9.20.4.10 fixed 9.20.4.10 - vendor:cisco adaptive security appliance software affected >= 9.22, < 9.22.2.14 fixed 9.22.2.14 - vendor:cisco adaptive security appliance software affected >= 9.23, < 9.23.1.19 fixed 9.23.1.19 - vendor:cisco secure firewall threat defense affected >= 7.0.0, < 7.0.8.1 fixed 7.0.8.1 - vendor:cisco secure firewall threat defense affected >= 7.1.0, < 7.2.10.2 fixed 7.2.10.2 - vendor:cisco secure firewall threat defense affected >= 7.3.0, < 7.4.2.4 fixed 7.4.2.4 - vendor:cisco secure firewall threat defense affected >= 7.6.0, < 7.6.2.1 fixed 7.6.2.1 - vendor:cisco secure firewall threat defense affected >= 7.7.0, < 7.7.10.1 fixed 7.7.10.1 ## Fix Follow the vendor and CISA mitigation guidance referenced in the KEV entry (ED 25-03); the sources do not name a fixed version. ## Timeline - 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-20362 - 2026-10-23T23:44:51+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2025-20362 ## From the sources Update: On November 5, 2025, Cisco became aware of a new attack variant against devices running Cisco Secure ASA Software or Cisco Secure FTD Software releases that are affected by CVE-2025-20333 and CVE-2025-20362. This attack can cause unpatched devices to unexpectedly reload, leading to denial of service (DoS) conditions. Cisco strongly recommends that all customers upgrade to the fixed software releases that are listed in the Fixed Software ["#fs"] section of this advisory. 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 access restricted URL endpoints that are related to remote access VPN that should otherwise be inaccessible without authentication. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted web server on a device. A successful exploit could allow the attacker to access a restricted URL without authentication. --- _Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_