Quick answers
- Is CVE-2026-20013 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-20013 being exploited in the wild.
- How severe is CVE-2026-20013?
- 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-2026-20013?
- 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-2026-20013 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-20013?
- 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
CVE-2026-20013 is a memory leak vulnerability in the IKEv2 packet processing code of Cisco Secure Firewall ASA and FTD software. The root cause is improper memory management that fails to free memory during IKEv2 packet processing, leading to memory exhaustion over time. An unauthenticated remote attacker can exploit this by sending crafted IKEv2 packets to an affected device with IKEv2 VPN enabled, requiring no authentication or user interaction. A successful exploit exhausts system resources and causes a denial of service condition, eventually requiring manual device reload. The vulnerability is mitigated by Cisco software updates; no workarounds are available.
Affected products
- Cisco Secure Firewall ASA Software <UNKNOWN>
- Cisco Secure Firewall Threat Defense Software <UNKNOWN>
Timeline
- 2026-03-04: disclosed