Cisco patches high-severity DoS flaw in ASA and FTD firewall software
Cisco disclosed CVE-2026-20154, a high-severity flaw in Secure Firewall ASA and Threat Defense software. Improper rate limiting of syslog message 419002 lets an unauthenticated remote attacker flood TCP SYN packets, causing high CPU utilization and denial of service. Cisco released software updates and workarounds addressing the vulnerability.
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