CVE-2026-20015 is a medium-severity vulnerability found in the IKEv2 feature of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software. This vulnerability allows unauthenticated, remote attackers to exploit a memory leak when parsing IKEv2 packets. By sending crafted packets to an affected device, an attacker could exhaust resources, resulting in a denial of service (DoS) condition. This could impact the availability of services across the network, necessitating manual device reloads.
Cisco has classified this vulnerability with a CVSS score of 5.8, indicating a medium level of severity. The implications of this vulnerability are significant, as it can disrupt services for devices relying on the affected Cisco products. Therefore, organizations utilizing Cisco Secure Firewall ASA and FTD Software should prioritize addressing this vulnerability to maintain operational integrity.
Currently, there is no known public exploit for CVE-2026-20015, but the potential for exploitation necessitates vigilance. Organizations should monitor their systems for unusual activity and be prepared to implement patches or mitigations as they become available.
As a preventive measure, organizations should incorporate this vulnerability into their risk management and remediation strategies. The urgency for patching this vulnerability is categorized as medium, suggesting that it should be addressed in the next patch cycle.
Vulnerability Details
The vulnerability arises from a memory leak in the IKEv2 feature of Cisco Secure Firewall ASA and FTD Software. The affected products include versions of the adaptive security appliance software and firepower threat defense software. Specifically, devices running versions 9.18.1 through 9.18.4.71, 9.19.1 through 9.20.4.10, 9.22.1.1 through 9.22.2.13, and 9.23.1 through 9.23.1.19 are vulnerable.
The CWE classification for this vulnerability is CWE-401, indicating an improper resource management issue.
Technical Analysis
The root cause of CVE-2026-20015 is a memory leak that occurs when the IKEv2 packets are processed by the affected Cisco software. This vulnerability presents through a network attack vector with a low attack complexity, meaning that an attacker does not require significant resources or expertise to exploit it. Importantly, no privileges are required for an attacker to initiate an exploit, and user interaction is not necessary.
The impacts associated with this vulnerability are primarily on availability, as a successful attack could lead to the exhaustion of device resources, resulting in a DoS condition. Confidentiality and integrity are not impacted, further highlighting that this vulnerability primarily affects service availability.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2026-20015 is significant due to the potential for service disruption. Organizations that rely on Cisco Secure Firewall ASA and FTD Software for network defense could experience major service outages if this vulnerability is exploited. The blast radius could affect not only the vulnerable devices but also the availability of network services to all connected entities.
Given the medium CVSS score, organizations should assess the urgency of remediation based on their specific use cases and operational context. While this vulnerability is not classified as critical, the potential for exploitation and service interruption necessitates prompt action to address it.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Cisco products are affected by CVE-2026-20015: Adaptive Security Appliance Software versions from 9.18.1 to 9.18.4.71, 9.19.1 to 9.20.4.10, 9.22.1.1 to 9.22.2.13, and 9.23.1 to 9.23.1.19. Additionally, Firepower Threat Defense Software versions from 7.2.0 to 7.2.11, 7.3.0 to 7.4.3, 7.6.0 to 7.6.4, and 7.7.0 to 7.7.11 are also vulnerable.
Mitigation & Remediation
Organizations should prioritize patching the affected Cisco products to mitigate the risk associated with CVE-2026-20015. Cisco will provide updates addressing this vulnerability. For those unable to apply patches immediately, implementing network controls to restrict IKEv2 packet handling can help reduce exposure.
For more guidance on security testing and vulnerability management, organizations can refer to our penetration testing services that can help assess security postures.
Detection Guidance
To detect potential exploitation of CVE-2026-20015, organizations should monitor logs for indicators of abnormal packet traffic, particularly related to IKEv2. Behavioral anomalies such as unexpected service interruptions or resource exhaustion should be investigated promptly.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-20015 highlights the ongoing importance of rigorous vulnerability management practices. Organizations should adopt a proactive approach to vulnerability assessment and remediation to minimize the potential for exploitation. This incident also emphasizes the need for security teams to stay informed on the latest vulnerabilities and their implications.
For further insights on vulnerability trends, organizations may consider reviewing our articles on vulnerability management and best practices in penetration testing methodology for comprehensive defense strategies.
Additionally, organizations should engage with resources on AI-driven security assessments to enhance their vulnerability management efforts.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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