Cisco patches high-severity EIGRP DoS flaw in ASA and FTD firewalls
Cisco released software updates fixing CVE-2026-20222, a high-severity vulnerability in the EIGRP implementation of Secure Firewall ASA and Threat Defense software. An unauthenticated, adjacent attacker can send crafted EIGRP updates at high rate, triggering a memory leak that causes the device to reload unexpectedly, resulting in denial of service. No workarounds exist.
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Summary last validated Sep 16, 2026
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