CVE-1999-0063

Medium

Published: 11/01/1999(UTC)Updated: 16/06/2026(UTC)Translated: 18/06/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Very high risk

8.25%

94th percentile - higher than 94% of all known CVEs

Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.

An attacker can exploit this vulnerability to remotely crash network devices, leading to service availability disruptions.

It is recommended to restrict access to the syslog port and update the software to the latest version to minimize risk.

Original NVD description (English source)

Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.