VULNERABILITY INTELLIGENCE

CVE-1999-0453

CVSS score5 NONE

EPSS probability1.42%

CISA KEVNot currently listed

Published1999-01-01

Last modified2026-06-16

CVSS vectorAV:N/AC:L/Au:N/C:P/I:N/A:N

Description

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