A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat D
Affects Cisco ASA and FTD software running a vulnerable release with certain VPN web server configurations. Cisco's CVSS score is 9.9 (critical). Fixed in ASA 9.12.4.72 and 9.14.4.28.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in 9.12.4.72, 9.14.4.28
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
A vulnerability in the VPN web server of Cisco Secure Firewall ASA Software and Cisco Secure Firewall Threat Defense (FTD) Software allows an authenticated remote attacker to run arbitrary code on an affected device. Successful exploitation could give the attacker root-level control and potentially lead to a complete compromise of the device.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
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 authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device.
Timeline
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CVE published
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
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, 9.8.2.26, 9.8.2.28, 9.8.2.33, 9.8.2.35, 9.8.2.38, 9.8.3.8, 9.8.3.11, 9.8.3.14, 9.8.3.16, 9.8.3.18, 9.8.3.21, 9.8.3, 9.8.3.26, 9.8.3.29, 9.8.4, 9.8.4.3, 9.8.4.7, 9.8.4.8, 9.8.4.10, 9.8.4.12, and 176 more
- Cisco Cisco Secure Firewall Threat Defense (FTD) Software
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, 6.2.3.11, 6.2.3.9, 6.2.3.12, 6.2.3.13, 6.2.3.14, 6.2.3.15, 6.2.3.16, 6.2.3.17, 6.2.3.18, 6.6.0, 6.6.0.1, 6.6.1, 6.6.3, 6.6.4, 6.6.5, 6.6.5.1, 6.6.5.2, 6.6.7, 6.6.7.1, 6.6.7.2, and 64 more
References 1
sec.cloudapps.cisco.com
Questions about CVE-2025-20333
What does this mean?
The flaw is in the VPN web server and can let code run as root on the affected device, possibly leading to complete compromise of the device.Source: sec.cloudapps.cisco.com
Am I affected, and how do I check?
Cisco ASA Software and Cisco FTD Software running a vulnerable release with one or more of the VPN web server configurations listed in the advisory's two tables. Check the software release and the VPN web server settings on the device against those tables.Source: sec.cloudapps.cisco.com
What should I do about it?
Upgrade to a fixed release. The advisory names Cisco Secure Firewall ASA Software 9.12.4.72 or 9.14.4.28 as the fixes.Source: sec.cloudapps.cisco.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2025-09-25, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data