CVE-2011-0945: Cisco IOS

High severity, CVSS 7.8. EPSS: 1.8% chance of exploitation in the next 30 days.

Memory leak in the Data-link switching (aka DLSw) feature in Cisco IOS 12.1 through 12.4 and 15.0 through 15.1, and IOS XE 3.1.xS before 3.1.3S and 3.2.xS before 3.2.1S, when implemented over Fast Sequence Transport (FST), allows remote attackers to cause a denial of service (memory consumption and device reload or hang) via a crafted IP protocol 91 packet, aka Bug ID CSCth69364.

Affected products

• Cisco IOS: version 12.1 only; version 12.1t only; version 12.1xi only; version 12.1xj only; version 12.1xl only; version 12.1xm only; …
• Cisco IOS XE: version 3.1.0s only; version 3.1.1s only; version 3.1.2s only; version 3.2.0s only

Published 2011-10-03. Last modified 2026-06-16.