VULNERABILITY INTELLIGENCE

CVE-2004-0551

CVSS score5 MEDIUM

EPSS probability3.13%

CISA KEVNot currently listed

Published2004-08-06

Last modified2026-06-16

Description

Cisco CatOS 5.x before 5.5(20) through 8.x before 8.2(2) and 8.3(2)GLX, as used in Catalyst switches, allows remote attackers to cause a denial of service (system crash and reload) by sending invalid packets instead of the final ACK portion of the three-way handshake to the (1) Telnet, (2) HTTP, or (3) SSH services, aka "TCP-ACK DoS attack."