Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.
https://exchange.xforce.ibmcloud.com/vulnerabilities/CVE-1999-0063
Source: Mitre, NVD
Published: 1999-01-11
Updated: 2024-11-20
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P
Severity: Medium
Base Score: 9.1
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Severity: Critical