How severe is CVE-2006-4776?

CVE-2006-4776 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2006-4776 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-4776?

CVE-2006-4776 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2006-4776?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2006-4776 published?

CVE-2006-4776 was published on 2006-09-14 and last updated on 2026-06-16.

CVE-2006-4776

CVE-2006-4776 is a high-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 7% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Cisco Ios
Published: 2006-09-14
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2006-4776?: 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.
How severe is CVE-2006-4776?: CVE-2006-4776 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2006-4776 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-4776?: CVE-2006-4776 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2006-4776?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2006-4776 published?: CVE-2006-4776 was published on 2006-09-14 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:o:cisco:ios:12.1\(19\):*:*:*:*:*:*:*

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