What is CVE-2011-1640?

CVE-2011-1640 is a high-severity vulnerability in Cisco iOS, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2011-10-22.

How severe is CVE-2011-1640?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Cisco iOS

CVE-2011-1640

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.

Vulnerability class: DoS (Denial of Service)

Published 2011-10-22 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.018 (77.2th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Cisco iOS

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/release/notes/cav… (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2011-1640?: CVE-2011-1640 is a high-severity vulnerability in Cisco iOS, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2011-10-22.
How severe is CVE-2011-1640?: High severity. CVSS v3 base score is 7.5 out of 10.