Cisco ASA/FTD IKEv2 DoS via Memory Leak
CVE-2026-20015 Published on March 4, 2026
A vulnerability in the IKEv2 feature of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device that may impact the availability of services to devices elsewhere in the network. This vulnerability is due to a memory leak when parsing 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 exhaust resources, causing a DoS condition that will eventually require the device to be manually reloaded.
Vulnerability Analysis
CVE-2026-20015 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a small impact on availability.
Weakness Type
What is a Memory Leak Vulnerability?
The software does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is often triggered by improper handling of malformed data or unexpectedly interrupted sessions. In some languages, developers are responsible for tracking memory allocation and releasing the memory. If there are no more pointers or references to the memory, then it can no longer be tracked and identified for release.
CVE-2026-20015 has been classified to as a Memory Leak vulnerability or weakness.
Products Associated with CVE-2026-20015
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Affected Versions
Cisco Secure Firewall Adaptive Security Appliance (ASA) Software:- Version 9.18.1 is affected.
- Version 9.18.1.3 is affected.
- Version 9.18.2 is affected.
- Version 9.18.2.5 is affected.
- Version 9.18.2.7 is affected.
- Version 9.18.2.8 is affected.
- Version 9.18.3 is affected.
- Version 9.18.3.39 is affected.
- Version 9.18.3.46 is affected.
- Version 9.18.3.53 is affected.
- Version 9.18.3.55 is affected.
- Version 9.18.3.56 is affected.
- Version 9.18.4 is affected.
- Version 9.18.4.5 is affected.
- Version 9.18.4.8 is affected.
- Version 9.18.4.22 is affected.
- Version 9.18.4.24 is affected.
- Version 9.18.4.29 is affected.
- Version 9.18.4.34 is affected.
- Version 9.18.4.40 is affected.
- Version 9.18.4.47 is affected.
- Version 9.18.4.50 is affected.
- Version 9.18.4.52 is affected.
- Version 9.18.4.53 is affected.
- Version 9.18.4.57 is affected.
- Version 9.19.1 is affected.
- Version 9.19.1.5 is affected.
- Version 9.19.1.9 is affected.
- Version 9.19.1.12 is affected.
- Version 9.19.1.18 is affected.
- Version 9.19.1.22 is affected.
- Version 9.19.1.24 is affected.
- Version 9.19.1.27 is affected.
- Version 9.19.1.28 is affected.
- Version 9.19.1.31 is affected.
- Version 9.19.1.37 is affected.
- Version 9.19.1.38 is affected.
- Version 9.19.1.42 is affected.
- Version 9.20.1 is affected.
- Version 9.20.1.5 is affected.
- Version 9.20.2 is affected.
- Version 9.20.2.10 is affected.
- Version 9.20.2.21 is affected.
- Version 9.20.2.22 is affected.
- Version 9.20.3 is affected.
- Version 9.20.3.4 is affected.
- Version 9.20.3.7 is affected.
- Version 9.20.3.9 is affected.
- Version 9.20.3.10 is affected.
- Version 9.20.3.13 is affected.
- Version 9.20.3.16 is affected.
- Version 9.22.1.1 is affected.
- Version 9.22.1.3 is affected.
- Version 9.22.1.2 is affected.
- Version 9.22.1.6 is affected.
- Version 9.22.2 is affected.
- Version 9.23.1 is affected.
- Version 7.2.0 is affected.
- Version 7.2.0.1 is affected.
- Version 7.2.1 is affected.
- Version 7.2.2 is affected.
- Version 7.2.3 is affected.
- Version 7.2.4 is affected.
- Version 7.2.4.1 is affected.
- Version 7.2.5 is affected.
- Version 7.2.5.1 is affected.
- Version 7.2.6 is affected.
- Version 7.2.7 is affected.
- Version 7.2.5.2 is affected.
- Version 7.2.8 is affected.
- Version 7.2.8.1 is affected.
- Version 7.2.9 is affected.
- Version 7.2.10 is affected.
- Version 7.2.10.2 is affected.
- Version 7.3.0 is affected.
- Version 7.3.1 is affected.
- Version 7.3.1.1 is affected.
- Version 7.3.1.2 is affected.
- Version 7.4.0 is affected.
- Version 7.4.1 is affected.
- Version 7.4.1.1 is affected.
- Version 7.4.2 is affected.
- Version 7.4.2.1 is affected.
- Version 7.4.2.2 is affected.
- Version 7.4.2.3 is affected.
- Version 7.4.2.4 is affected.
- Version 7.6.0 is affected.
- Version 7.6.1 is affected.
- Version 7.6.2 is affected.
- Version 7.6.2.1 is affected.
- Version 7.7.0 is affected.