A vulnerability in the Internet Key Exchange version 2 (IKEv2) feature of Cisco IOS Software, Cisco IOS XE Software, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a memory leak, resulting in a denial of service (DoS) condition on an affected device. This vulnerability is due to improper parsing of IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device.
A successful exploit of Cisco IOS Software and IOS XE Software could allow the attacker to cause the affected device to reload, resulting in a DoS condition. A successful exploit of Cisco Secure Firewall ASA Software and Secure FTD Software could allow the attacker to partially exhaust system memory, resulting in system instability, such as the inability to establish new IKEv2 VPN sessions. A manual reboot of the device is required to recover from this condition.
Given the potential impact and the high CVSS score of 8.6, this vulnerability presents a significant risk to organizations utilizing these Cisco products. As such, organizations should prioritize patching immediately.
Risk to organizations includes potential service interruptions and the need for manual intervention to restore functionality. The exploitation of this vulnerability can lead to substantial operational disruptions, emphasizing the importance of timely remediation.
Vulnerability Details
The vulnerability, identified as CVE-2026-20012, is categorized as a high-severity issue affecting several Cisco products. It has been assigned a CVSS score of 8.6, indicating a high risk due to the availability impact being rated as high. The vulnerability stems from improper parsing of IKEv2 packets, which attackers can exploit to cause a memory leak and subsequent DoS condition.
The affected products include Cisco IOS Software, Cisco IOS XE Software, Cisco Secure Firewall ASA Software, and Cisco Secure Firewall FTD Software. The vulnerability was published on March 25, 2026, and is classified under CWE-401.
Technical Analysis
The root cause of CVE-2026-20012 is improper parsing of IKEv2 packets. Attackers can exploit this vulnerability remotely, with no authentication required. The attack complexity is low, as it does not necessitate user interaction. The impact on availability is high, as successful exploitation can lead to the affected device reloading or becoming unstable.
Given the nature of the vulnerability, there are no confidentiality or integrity impacts associated with it. Affected organizations should be aware of the potential for significant service disruptions, particularly in environments reliant on IKEv2 VPN sessions.
Risk & Impact Analysis
The exploitation of CVE-2026-20012 poses a substantial risk to organizations, particularly those using Cisco's IKEv2 feature in critical operations. The potential for denial of service can significantly affect business continuity and operational efficiency.
Organizations should assess their exposure to this vulnerability. The blast radius is considerable, as any device utilizing the vulnerable Cisco software could be affected. Given the high CVSS score, immediate attention and remediation efforts are warranted.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of Cisco IOS Software, IOS XE Software, Secure Firewall ASA Software, and Secure Firewall FTD Software are affected. Organizations should refer to the vendor's advisory for specific version details.
Mitigation & Remediation
Organizations should prioritize patching immediately. It is crucial to apply the latest updates provided by Cisco to mitigate this vulnerability. If a patch is not available, consider implementing network controls to limit exposure to the internet and monitor for any unusual activity.
Detection Guidance
Monitor logs for any anomalous IKEv2 packets and unusual device reboots, which may indicate exploitation attempts. Additionally, keeping an eye on system resource usage can help identify potential memory exhaustion issues.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-20012 highlights the importance of robust input validation mechanisms, particularly for network protocols like IKEv2. This vulnerability represents a trend where improper parsing can lead to severe availability impacts, underscoring the need for rigorous testing and validation in security practices.
Security teams should take this incident as a lesson to enhance their defenses against similar vulnerabilities. Regular security assessments, including penetration testing, can help identify weaknesses before they are exploited.
In summary, organizations must remain vigilant and proactive in their security posture to combat evolving threats effectively.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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