CVE-2006-4776

Heap-based buffer overflow in the VLAN Trunking Protocol (VTP) feature in Cisco IOS 12.1(19)...

7.5 High

Heap-based buffer overflow in the VLAN Trunking Protocol (VTP) feature in Cisco IOS 12.1(19) allows remote attackers to execute arbitrary code via a long VLAN name in a VTP type 2 summary advertisement.

Exploit likelihood

7.96%Down 3.3 points since Feb 4, 2022

What each source reports

NVD Score used 7.5

Record: CVE-2006-4776
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-119
Updated: 2026-11-02

CVE List No score

Record: CVE-2006-4776
Updated: 2026-11-02

EUVDEUVD-2006-4763 No score

Record: EUVD-2006-4763
Updated: 2026-11-03

GitHub AdvisoriesGHSA-w4j4-63w3-w6m9 No score

Heap-based buffer overflow in the VLAN Trunking Protocol (VTP) feature in Cisco IOS 12.1(19)...

Record: GHSA-w4j4-63w3-w6m9
Weakness: CWE-119
Updated: 2026-11-02

Affected products

cisco ios

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2006-4776 is a high vulnerability (CVSS 7.5) in Cisco Ios, published September 14, 2006. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 7.96%, the 94th percentile. No source names a fixed version.

References

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