CVE-2011-1640: Cisco IOS

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

The ethernet-lldp component in Cisco IOS 12.2 before 12.2(33)SXJ1 does not properly support a large number of LLDP Management Address (MA) TLVs, which allows remote attackers to cause a denial of service (device crash) via crafted LLDPDUs, aka Bug ID CSCtj22354.

Affected products

• Cisco IOS: from 12.2, before 12.2\(33\)sxj1 (fixed in 12.2\(33\)sxj1)

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