CVE-2010-0577: Cisco IOS

High severity, CVSS 7.1. EPSS: 2.5% chance of exploitation in the next 30 days.

Cisco IOS 12.2 through 12.4, when certain PMTUD, SNAT, or window-size configurations are used, allows remote attackers to cause a denial of service (infinite loop, and device reload or hang) via a TCP segment with crafted options, aka Bug ID CSCsz75186.

Affected products

• Cisco IOS: version 12.2b only; version 12.2bc only; version 12.2bx only; version 12.2by only; version 12.2bz only; version 12.2cx only; …

Published 2010-03-25. Last modified 2026-06-16.