CVE-2011-2059: Cisco IOS

Medium severity, CVSS 5.0. EPSS: 1.6% chance of exploitation in the next 30 days.

The ipv6 component in Cisco IOS before 15.1(4)M1.3 allows remote attackers to conduct fingerprinting attacks and obtain potentially sensitive information about the presence of the IOS operating system via an ICMPv6 Echo Request packet containing a Hop-by-Hop (HBH) extension header (EH) with a 0x0c01050c value in the PadN option data, aka Bug ID CSCtq02219.

Affected products

• Cisco IOS: before 15.1\(4\)m1.3 (fixed in 15.1\(4\)m1.3)

Published 2011-10-22. Last modified 2026-06-16.