CVE-2011-3271: Cisco IOS

High severity, CVSS 10.0. EPSS: 10.8% chance of exploitation in the next 30 days.

Unspecified vulnerability in the Smart Install functionality in Cisco IOS 12.2 and 15.1 allows remote attackers to execute arbitrary code or cause a denial of service (device crash) via crafted TCP packets to port 4786, aka Bug ID CSCto10165.

Affected products

• Cisco IOS: version 12.2 only; version 15.1 only

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