Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since September 25, 2025.
CVE-2025-20333
Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense vulnerability
Added to KEV September 25, 2025
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2025-20333
- CWE
- CWE-120
- Affected products
- Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense · Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense · Cisco
What happened
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.
What it means for your business
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2025-20333). 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. CISA remediation due date: 2025-09-26. If you need help checking exposure, call (864) 335-9223.
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.
CISA due date: September 26, 2025
Sources
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