CVE-2001-0751: Cisco Cbos

High severity, CVSS 7.5. EPSS: 2.6% chance of exploitation in the next 30 days.

Cisco switches and routers running CBOS 2.3.8 and earlier use predictable TCP Initial Sequence Numbers (ISN), which allows remote attackers to spoof or hijack TCP connections.

Affected products

• Cisco Cbos: up to and including 2.3.8

Published 2001-10-18. Last modified 2026-06-16.