On 2025-09-25, CISA added CVE-2025-20362 (Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense) to its Known Exploited Vulnerabilities (KEV) Catalog [2]. The vulnerability is listed in the catalog as "Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization Vulnerability" [2]. CISA requires remediation in accordance with vendor mitigation instructions; see the original text in the body for specific requirements [2].
Backfill: this event became public on Sep 25, 2025 and we added it on Nov 10, 2026. It is not a new event.
CISA Adds Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Vulnerability CVE-2025-20362 to Known Exploited Vulnerabilities Catalog
1 min read
- Disclosed
- Sep 25, 2025
- Published
- Nov 10, 2026
- Last updated
- Nov 8, 2026
- CVSS basis
- Our assessment
- 86.7%, higher than 100% of CVEs
- Exploitation and patch status
- ExploitedKEV
- Attack vector
- Vulnerability status
- Actor type
- Motivation
On this page
30-second summary
What happened
Who is affected
Industries mainly affected: Government, Cross-industry
What to do nowOur advice
CISA requires remediation in accordance with vendor mitigation instructions; see the original text in the body for specific requirements [2]
Timeline
Technical details
CISA KEV Listing Record
On 2025-09-25, CISA added CVE-2025-20362 to the catalog for Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense [2].
Original Technical Description
Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software Web Server contain a missing authorization vulnerability. This vulnerability could be chained with CVE-2025-20333. [2]
Official Requirements
The KEV due date refers to the deadline by which FCEB agencies are expected to review and begin implementing the guidance outlined in Emergency Directive (ED) 25-03 (URL listed below in Notes). Agencies must follow the steps provided by CISA (URL listed below in Notes) and vendor’s instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available. [2]
Individual Vulnerability Record
The U.S. National Vulnerability Database (NVD) provides an independent vulnerability record and description for CVE-2025-20362. [1]
References
Official / primary3
- [1]
“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”
- [2]
This site aggregates public information and is not security consulting advice. Test remediation steps before applying.