Quick answers
- Is CVE-2026-20015 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-20015 being exploited in the wild.
- How severe is CVE-2026-20015?
- Medium severity, with a CVSS score of 5.8, published 4 March 2026.
- Which products and versions are affected?
- Cisco Secure Firewall ASA Software <UNKNOWN>; Cisco Secure Firewall Threat Defense Software <UNKNOWN>.
- Is there a fix for CVE-2026-20015?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-20015 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-20015?
- Check whether you run Cisco Secure Firewall ASA Software or Cisco Secure Firewall Threat Defense Software at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a memory leak (CWE-401) in the IKEv2 packet parsing logic of Cisco ASA and FTD software. When processing crafted IKEv2 packets, the affected code fails to properly free allocated memory during packet handling, leading to progressive memory exhaustion. The attack is unauthenticated and network-reachable, requiring only IKEv2 to be enabled on an interface; an attacker sends a stream of malformed IKEv2 packets to trigger the leak. Upon successful exploitation, memory is exhausted, causing a denial of service that requires manual device reload. Cisco has released software patches to address this vulnerability; no workarounds are available.
Affected products
- Cisco Secure Firewall ASA Software <UNKNOWN>
- Cisco Secure Firewall Threat Defense Software <UNKNOWN>
Timeline
- 2026-03-04: disclosed