Cisco patches IKEv2 certificate authentication DoS in ASA and FTD
Cisco disclosed CVE-2026-20249, a high-severity flaw in IKEv2 certificate authentication for Secure Firewall ASA and Threat Defense software. A logic error during connection setup lets an unauthenticated remote attacker send a crafted certificate, crashing the IKEv2 process and causing a denial of service. Cisco released software updates; no workarounds exist.
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