High severity · published Aug 14, 2025
CVE-2025-20222
Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Buffer Vulnerability
8.6
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CF
Cisco Firepower Threat Defense Software · Cisco
6.2.3; 6.2.3.9; 6.2.3.1; 6.2.3.2; 6.2.3.10; 6.4.0; +34 more · source: vendor
Affected product
CF
Cisco Firepower Threat Defense Software
Cisco
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-20222
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-20222
sec.cloudapps.cisco.com
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fp2k-IPsec-dos-tjwgdZCO
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