Multiple vulnerabilities in the management and VPN web servers for Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to stop responding or reload unexpectedly, resulting in a denial of service (DoS) condition.
These vulnerabilities are due to improper validation of user-supplied input to application endpoints. An attacker could exploit these vulnerabilities by sending crafted HTTP requests to a targeted web server on a device. A successful exploit could allow the attacker to cause a DoS condition when the device stops responding or reloads.
Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-vpn-dos-mfPekA6e
This advisory is part of the August 2025 release of the Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: August 2025 Semiannual Cisco Secure Firewall ASA, Secure FMC, and Secure FTD Software Security Advisory Bundled Publication.
Security Impact Rating: High
CVE: CVE-2025-20133,CVE-2025-20243
Source:: Cisco Security Advisories