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Cisco Security Notice: Cisco IOS Syslog Crash - Certain versions of Cisco IOS software may crash or hang when they receive invalid user datagram protocol (UDP) packets sent to their "syslog" ports (port 514), from tools such as the latest nmap scanner. This severe DoS attack can completely shut down Cisco IOS products and force manual physical reset.

Cisco Security Notice: Cisco IOS Syslog Crash - Certain versions of Cisco IOS software may crash or hang when they receive invalid user datagram protocol (UDP) packets sent to their "syslog" ports (port 514), from tools such as the latest nmap scanner. This severe DoS attack can completely shut down Cisco IOS products and force manual physical reset.