CVE-2025-20182: High Vulnerability in Cisco Adaptive Security Appliance Software

A vulnerability in the Internet Key Exchange version 2 (IKEv2) protocol processing of Cisco Adaptive Security Appliance (ASA) Software, Cisco Firepower Threat Defense (FTD) Software, Cisco IOS Software, and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation when processing IKEv2 messages. An attacker could exploit this vulnerability by sending crafted IKEv2 traffic to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition on the affected device.

The CVSS score of 8.6 categorizes this vulnerability as high severity, indicating that organizations should address it with urgency. Risk to organizations includes potential outages and disruptions to services relying on the affected devices. Attackers may leverage this vulnerability to impact device availability.

As there are currently no known exploits in the wild, it is crucial for organizations to implement the necessary patches as soon as they are available to avoid any potential future exploitation. Organizations should prioritize patching immediately.

Cisco has acknowledged this vulnerability and it is actively working on a resolution. The urgency for defenders is high, given the potential impact on network availability.

Vulnerability Details

The vulnerability is categorized under CWE-787: Out-of-bounds Write. It affects multiple versions of Cisco ASA, including versions 9.8.1, 9.8.2, and 9.12. The details of the CVSS vector are as follows: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Technical Analysis

Root cause analysis indicates that the vulnerability stems from insufficient input validation in the IKEv2 protocol processing. An attacker can exploit this vulnerability through a network attack vector, requiring low attack complexity, no privileges, and no user interaction. The availability impact is high, while confidentiality and integrity impacts are none.

Risk & Impact Analysis

Real-world deployment risk involves potential service outages and disruptions. The blast radius could be significant depending on the number of devices affected and their role in organizational operations. Organizations should assess their environment for any Cisco products that may be vulnerable and take appropriate action. Given the CVSS score and potential impact, organizations should address this vulnerability in priority patch cycle.

Exploitation Status

Affected Versions

All versions prior to vendor patch are affected, specifically those in the Cisco Adaptive Security Appliance software and Firepower Threat Defense software.

Mitigation & Remediation

Organizations should prioritize patching immediately. Cisco has released patches for the affected versions, and upgrading to the latest version is strongly recommended. For more details on continuous security testing, please refer to continuous penetration testing to identify similar weaknesses.

Detection Guidance

Monitor logs for unusual IKEv2 traffic patterns and behavioral anomalies. Implement network signatures to detect potential exploitation attempts, and closely observe system changes following any incidents.

AppSecure Threat Intelligence Insight

This vulnerability highlights the ongoing risks associated with IKEv2 protocol vulnerabilities, underscoring the necessity for organizations to maintain a robust vulnerability management program. For additional insights on security testing best practices, consider exploring penetration testing methodology and the importance of proactive measures against such vulnerabilities. Continuous learning and adaptation are critical in today's threat landscape. Engaging with experts in the field can provide organizations with the insights needed for better security postures, such as through vulnerability management program design and remaining vigilant against evolving threats.