CVE-2011-4231: Cisco IOS

Medium severity, CVSS 6.3. EPSS: 0.6% chance of exploitation in the next 30 days.

Cisco IOS 15.1 and 15.2 and IOS XE 3.x, when configured as an IPsec hub with X.509 certificates in use, allows remote authenticated users to cause a denial of service (segmentation fault and device crash) via unspecified vectors, aka Bug ID CSCtq61128.

Affected products

• Cisco IOS: version 15.1 only; version 15.2 only
• Cisco IOS XE: version 3.1.0s only; version 3.1.0sg only; version 3.1.1s only; version 3.1.1sg only; version 3.1.2s only; version 3.1.3s only; …

Published 2012-05-03. Last modified 2026-06-16.