CVE-2011-1640

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-10-22 · updated 2026-06-16
Weakness: CWE-400

Description

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

How to fix

Upgrade to a fixed version: Cisco IOS 12.2\(33\)sxj1. Check the vendor advisory for mitigations.

References

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/release/notes/caveats_SXJ.html
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/release/notes/caveats_SXJ.html

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