CVE-1999-0453

Medium CVSS 5

Published 1999-01-01 · last changed 2026-06-16

The fix

We hold no Microsoft remediation data for CVE-1999-0453, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the Cisco Discovery Protocol (CDP).

Sources

NVD record for CVE-1999-0453

CVSS vector: AV:N/AC:L/Au:N/C:P/I:N/A:N