CVE-2025-20222 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Buffer Vulnerability
Unauthenticated remote attackers can cause a device reload and denial of service by sending crafted IPv6 packets over an IPsec VPN connection.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-20222?
CVE-2025-20222 is a high-severity denial of service vulnerability in Cisco Firepower Threat Defense Software, published on 14 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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
Which versions are affected by CVE-2025-20222?
How do I fix CVE-2025-20222?
No fix has been published for CVE-2025-20222 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-20222 being exploited?
There is no known exploitation of CVE-2025-20222 in the wild and no public exploit code.
Sources
Also known as GHSA-qwrq-hc6q-9r7j.