CVE-2012-0386: Cisco IOS

High severity, CVSS 7.8. EPSS: 3.1% chance of exploitation in the next 30 days.

The SSHv2 implementation in Cisco IOS 12.2, 12.4, 15.0, 15.1, and 15.2 and IOS XE 2.3.x through 2.6.x and 3.1.xS through 3.4.xS before 3.4.2S allows remote attackers to cause a denial of service (device reload) via a crafted username in a reverse SSH login attempt, aka Bug ID CSCtr49064.

Affected products

• Cisco IOS: version 12.2 only; version 12.4 only; version 15.0 only; version 15.1 only; version 15.2 only
• Cisco IOS XE: version 2.3 only; version 2.3.0 only; version 2.3.1 only; version 2.3.1t only; version 2.3.2 only; version 2.4 only; …

Published 2012-03-29. Last modified 2026-06-16.