CVE-2011-2057

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-20

Description

The cat6000-dot1x component in Cisco IOS 12.2 before 12.2(33)SXI7 does not properly handle (1) a loop between a dot1x enabled port and an open-authentication dot1x enabled port and (2) a loop between a dot1x enabled port and a non-dot1x port, which allows remote attackers to cause a denial of service (traffic storm) via unspecified vectors that trigger many Spanning Tree Protocol (STP) Bridge Protocol Data Unit (BPDU) frames, aka Bug ID CSCtq36327.

Affected products

Cisco IOS: from 12.2 before 12.2\(33\)sxi7 — fixed in 12.2\(33\)sxi7

How to fix

Upgrade to a fixed version: Cisco IOS 12.2\(33\)sxi7. Check the vendor advisory for mitigations.

References

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