CVE-2025-20222
Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Buffer Vulnerability
Description
A vulnerability in the RADIUS proxy feature for the IPsec VPN feature of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper processing of IPv6 packets. An attacker could exploit this vulnerability by sending IPv6 packets over an IPsec VPN connection to an affected device. A successful exploit could allow the attacker to trigger a reload of the device, resulting in a DoS condition.
Weakness: CWE-120
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Firepower Threat Defense (FTD) Check your version | Firewall / NGFW | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco Firepower Threat Defense Software
Vendor advisory
cisco-sa-fp2k-IPsec-dos-tjwgdZCO
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software for Firepower 2100 Series IPv6 over IPsec Denial of Service Vulnerability
Cisco’s rating: High (advisory CVSS 8.6) · Published Aug 14, 2025 · updated Sep 9, 2025 (revision 1.1)
Bug ID: CSCwm95070
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from