How severe is CVE-2008-4963?

CVE-2008-4963 has a CVSS 2.0 base score of 7.1, rated high severity.

Is CVE-2008-4963 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-4963?

CVE-2008-4963 primarily affects Cisco Catos. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-4963?

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-2008-4963 published?

CVE-2008-4963 was published on 2008-11-06 and last updated on 2026-06-16.

CVE-2008-4963

CVE-2008-4963 is a high-severity vulnerability in Cisco Catos with a CVSS 2.0 base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.1)
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cisco Catos
Published: 2008-11-06
Last modified: 2026-06-16

Description

Unspecified vulnerability in the VLAN Trunking Protocol (VTP) implementation on Cisco IOS and CatOS, when the VTP operating mode is not transparent, allows remote attackers to cause a denial of service (device reload or hang) via a crafted VTP packet sent to a switch interface configured as a trunk port.

Frequently asked questions

What is CVE-2008-4963?: Unspecified vulnerability in the VLAN Trunking Protocol (VTP) implementation on Cisco IOS and CatOS, when the VTP operating mode is not transparent, allows remote attackers to cause a denial of service (device reload or hang) via a crafted VTP packet sent to a switch interface configured as a trunk port.
How severe is CVE-2008-4963?: CVE-2008-4963 has a CVSS 2.0 base score of 7.1, rated high severity.
Is CVE-2008-4963 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-4963?: CVE-2008-4963 primarily affects Cisco Catos. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-4963?: 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-2008-4963 published?: CVE-2008-4963 was published on 2008-11-06 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:o:cisco:catos:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*

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