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A vulnerability in the IKEv2 feature of Cisco IOS Software, IOS XE Software, Secure Firewall ASA Software, and Secure FTD Software could allow an unauthenticated, remote attacker to cause the device to reload, resulting in a DoS condition.

This vulnerability is due to the improper processing of IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. A successful exploit could allow the attacker to cause an infinite loop that exhausts resources and could cause the device to reload.

CVE-2025-20253 is a high-severity vulnerability affecting the Internet Key Exchange version 2 (IKEv2) feature in multiple Cisco products, including Cisco IOS Software, IOS XE Software, Secure Firewall ASA Software, and Secure FTD Software. The vulnerability arises from improper processing of IKEv2 packets, which can be exploited by an unauthenticated remote attacker. By sending specially crafted IKEv2 packets to an affected device, the attacker can trigger an infinite loop condition within the device's processing logic. This infinite loop exhausts system resources, ultimately causing the device to reload unexpectedly, resulting in a denial-of-service (DoS) condition. The vulnerability affects a broad range of Cisco Adaptive Security Appliance (ASA) Software versions, spanning from older releases such as 9.8.1 to more recent versions like 9.23.1, indicating a widespread exposure across many deployments. The CVSS v3.1 base score is 8.6, reflecting a high severity due to the network vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and a scope change (S:C) where the impact affects components beyond the vulnerable one. The impact is limited to availability (A:H) with no confidentiality or integrity loss. No known exploits in the wild have been reported yet, but the ease of exploitation and the critical role of affected devices in network security make this vulnerability a significant concern. The vulnerability can disrupt VPN tunnels and firewall operations, potentially impacting business continuity and security monitoring.

Detailed information about CVE-2025-20253: Loop with Unreachable Exit Condition ('Infinite Loop') in Cisco Cisco Adaptive Security Appliance (ASA) Software affe

CVE-2025-20253: Loop with Unreachable Exit Condition ('Infinite Loop') in Cisco Cisco Adaptive Security Appliance (ASA) Software - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-20253: Loop with Unreachable Exit Condition ('Infinite Loop') in Cisco Cisco Adaptive Security Appliance (ASA) Software

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