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A vulnerability in the management and VPN web servers of Cisco Secure Firewall ASA Software and Secure FTD Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a DoS condition.

This vulnerability is due to improper validation of user-supplied input on an interface with VPN web services. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted web server on an affected device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads.

CVE-2025-20243 is a high-severity vulnerability affecting Cisco Adaptive Security Appliance (ASA) Software and Secure Firepower Threat Defense (FTD) Software, specifically targeting the management and VPN web servers. The root cause is improper validation of user-supplied input on an interface that handles VPN web services. An unauthenticated, remote attacker can exploit this vulnerability by sending specially crafted HTTP requests to the affected web server. This triggers a loop with an unreachable exit condition, effectively causing an infinite loop that leads the device to reload unexpectedly. The consequence of this forced reload is a denial-of-service (DoS) condition, temporarily disrupting firewall and VPN services. The vulnerability affects a wide range of ASA software versions, from older releases such as 9.8.1 up to recent versions like 9.23.1, indicating a long-standing issue that spans multiple major releases. The CVSS v3.1 base score is 8.6, reflecting a high severity due to the vulnerability's network attack vector (no authentication or user interaction required) and its impact on availability, although confidentiality and integrity remain unaffected. No known exploits have been reported in the wild yet, but the ease of exploitation and the critical role of ASA devices in network security make this a significant threat. The vulnerability's scope is broad given the extensive list of affected versions and the widespread deployment of Cisco ASA devices in enterprise and service provider networks worldwide.

Detailed information about CVE-2025-20243: Loop with Unreachable Exit Condition ('Infinite Loop') in Cisco Cisco Adaptive Security Appliance (ASA) Software affe

CVE-2025-20243: Loop with Unreachable Exit Condition ('Infinite Loop') in Cisco Cisco Adaptive Security Appliance (ASA) Software - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-20243: Loop with Unreachable Exit Condition ('Infinite Loop') in Cisco Cisco Adaptive Security Appliance (ASA) Software

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