CVE-2025-20333 — Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability
Severity: Critical · Kind: Vulnerability
What it is
AI offline placeholder summary for: Title: CVE-2025-20333 — Cisco Secure Firewall Adaptive Security Appliance (ASA).
Who this affects
AI summarisation is currently disabled — see the source link for the full upstream advisory.
What to do
Re-run summarisation from /admin/threats once ANTHROPIC_API_KEY is configured.
From the source
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense. Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a buffer overflow vulnerability that allows for remote code execution. This vulnerability could be chained with CVE-2025-20362. Required action: 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 mitigation 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.
Vulnerability facts
- CVE
- CVE-2025-20333
- On CISA KEV since
- 2025-09-25
- Ransomware use
- Unknown
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Plain-English summaries are AI-generated and reviewed for tone, not technical accuracy. For incident response, always rely on the original source linked above.