CVE-2001-0055: Cisco Broadband Operating System

Medium severity, CVSS 5.0. EPSS: 1.3% chance of exploitation in the next 30 days.

CBOS 2.4.1 and earlier in Cisco 600 routers allows remote attackers to cause a denial of service via a slow stream of TCP SYN packets.

Affected products

• Cisco Broadband Operating System: up to and including 2.3.8
• Cisco Cisco 6xx Routers: any version

Published 2001-02-16. Last modified 2026-06-16.