Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Logging Denial of Service Vulnerability
Cisco patched an ASA/FTD rate-limiting flaw where TCP SYN floods trigger excessive syslog 419002 messages, causing high CPU and degraded performance.
A vulnerability in the system rate-limiting process for syslog message 419002 in Cisco Secure Firewall ASA and FTD Software allows an unauthenticated, remote attacker to cause high CPU utilization. The flaw results from improper rate limiting; an attacker can exploit it by sending a flood of TCP SYN packets, degrading device performance. Cisco has released software updates.