What’s Vulnerable › Vulnerabilities
CVE-2026-20015
- Severity: medium (CVSS 5.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-04 · updated 2026-08-11
- Weakness: CWE-401
Description
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.
Affected products
- Cisco ASA Software: from 9.18.1 before 9.18.4.71; from 9.19.1 before 9.20.4.10; from 9.22.1.1 before 9.22.2.13; from 9.23.1 before 9.23.1.19 — fixed in 9.18.4.71, 9.20.4.10, 9.22.2.13, 9.23.1.19
- Cisco Firepower Threat Defense Software: from 7.2.0 before 7.2.11; from 7.3.0 before 7.4.3; from 7.6.0 before 7.6.4; from 7.7.0 before 7.7.11 — fixed in 7.2.11, 7.4.3, 7.6.4, 7.7.11
How to fix
Upgrade to a fixed version: Cisco ASA Software 9.18.4.71, 9.20.4.10, 9.22.2.13, 9.23.1.19; Cisco Firepower Threat Defense Software 7.2.11, 7.4.3, 7.6.4, 7.7.11. Check the vendor advisory for mitigations.
References
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