CVE-2025-20362: Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization Vulnerability (Pentest Lab Guide)
CVE-2025-20362: Technical Deep-Dive (Auto Refreshed)
Generated on 2026-03-23T21:24:53.653Z. This file is automatically regenerated every 30 minutes by the CVE AI enrichment job using web sources (NVD, MITRE, CISA KEV, GitHub).
Executive Technical Summary
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.
- Context preserved from previous revision: 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. Notes: A diagnostic security platform that demonstrates the critical importance of timely security updates
Technical Details
- CVE: CVE-2025-20362
- KEV date added: Unknown
- KEV due date: Not specified
- NVD published: 2025-09-25
- NVD modified: 2025-11-06
- MITRE modified: 2026-02-26
- CVSS base score: 6.5
- CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- CVSS exploitability score: 3.9
- CVSS impact score: 2.5
- Attack vector: Network
- Attack complexity: Low
- Privileges required: None
- User interaction: None
- Scope: Unchanged
- Confidentiality impact: Low
- Integrity impact: Low
- Availability impact: None
Versions and Products Impacted
- cisco / adaptive security appliance software (versions: >= 9.12, < 9.12.4.72)
- cisco / adaptive security appliance software (versions: >= 9.14, < 9.14.4.28)
- cisco / adaptive security appliance software (versions: >= 9.16, < 9.16.4.85)
- cisco / adaptive security appliance software (versions: >= 9.17.0, < 9.18.4.67)
- cisco / adaptive security appliance software (versions: >= 9.19, < 9.20.4.10)
- cisco / adaptive security appliance software (versions: >= 9.22, < 9.22.2.14)
- cisco / adaptive security appliance software (versions: >= 9.23, < 9.23.1.19)
- cisco / firepower threat defense (versions: >= 7.0.0, < 7.0.8.1)
- cisco / firepower threat defense (versions: >= 7.1.0, < 7.2.10.2)
- cisco / firepower threat defense (versions: >= 7.3.0, < 7.4.2.4)
- cisco / firepower threat defense (versions: >= 7.6.0, < 7.6.2.1)
- cisco / firepower threat defense (versions: >= 7.7.0, < 7.7.10.1)
- Cisco / Cisco Secure Firewall Adaptive Security Appliance (ASA) Software (versions: 9.8.1, 9.8.1.5, 9.8.1.7, 9.8.2, 9.8.2.8, 9.8.2.14, 9.8.2.15, 9.8.2.17, 9.8.2.20, 9.8.2.24)
- Cisco / Cisco Secure Firewall Threat Defense (FTD) Software (versions: 6.2.3, 6.2.3.1, 6.2.3.2, 6.2.3.3, 6.2.3.4, 6.2.3.5, 6.2.3.6, 6.2.3.7, 6.2.3.8, 6.2.3.10)
Weakness Classification
- CWE-862
Repositories for Lab Validation (Public Examples)
- dataclean-saas/API---Hole | stars: 0 | updated: 2025-10-14 | https://github.com/dataclean-saas/API---Hole
Notes: A diagnostic security platform that demonstrates the critical importance of timely security updates
People and Organizations Mentioned
- cisco
- dataclean-saas
Practical Defensive Validation (Authorized Only)
- Use only isolated environments and systems you own or are explicitly authorized to test.
- Snapshot infrastructure before validation and preserve baseline logs (EDR, SIEM, OS, app).
- Inventory cisco / adaptive security appliance software (versions: >= 9.12, < 9.12.4.72) assets and confirm exact vulnerable versions with automated checks.
- Patch in staged environments and validate closure with scanners + service health checks.
- Map detections to MITRE ATT&CK tactics relevant to your environment and tune alert quality.
References
- NVD record: https://nvd.nist.gov/vuln/detail/CVE-2025-20362
- MITRE CVE record: https://www.cve.org/CVERecord?id=CVE-2025-20362
- CISA KEV Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
- CISA KEV JSON feed: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-YROOTUW
- https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-20362
- Repository example: https://github.com/dataclean-saas/API---Hole
This content is for defensive security training and authorized validation only.