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High severity7.5NVD Advisory· Published Oct 22, 2011· Updated Jun 16, 2026

CVE-2011-2057

CVE-2011-2057

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.

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Affected products

2
  • Cisco Systems, Inc./Cisco iOS2 versions
    cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*range: >=12.2,<12.2\(33\)sxi7
    • (no CPE)range: <12.2(33)SXI7

Patches

Vulnerability mechanics

References

1

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