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Vulnerability record · CVE-2006-4775 · published 14 September 2006

CVE-2006-4775: Cisco ios vulnerability

Cisco · Ios

The VLAN Trunking Protocol (VTP) feature in Cisco IOS 12.1(19) and CatOS allows remote attackers to cause a denial of service by sending a VTP update with a revision value of 0x7FFFFFFF, which is incremented to 0x80000000 and is interpreted as a negative number in a signed context.

7.8 CVSS 2.0 High EPSS 5.0% · top 8.0% CWE-399 · CWE-399
7.8CVSS 2.0 base score
5.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
24References
16 Jun 2026Last modified by NVD

Description

The VLAN Trunking Protocol (VTP) feature in Cisco IOS 12.1(19) and CatOS allows remote attackers to cause a denial of service by sending a VTP update with a revision value of 0x7FFFFFFF, which is incremented to 0x80000000 and is interpreted as a negative number in a signed context.

AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://secunia.com/advisories/21896 Vendor Advisory
http://secunia.com/advisories/21902 Vendor Advisory
http://securitytracker.com/id?1016843
http://www.cisco.com/warp/public/707/cisco-sr-20060913-vtp.shtml Patch
http://www.kb.cert.org/vuls/id/175148 US Government Resource
http://www.osvdb.org/28776
http://www.phenoelit.de/stuff/CiscoVTP.txt
http://www.securityfocus.com/archive/1/445896/100/0/threaded
http://www.securityfocus.com/archive/1/445938/100/0/threaded
http://www.securityfocus.com/bid/19998
http://www.vupen.com/english/advisories/2006/3600 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/28925
http://secunia.com/advisories/21896 Vendor Advisory
http://secunia.com/advisories/21902 Vendor Advisory
http://securitytracker.com/id?1016843
http://www.cisco.com/warp/public/707/cisco-sr-20060913-vtp.shtml Patch
http://www.kb.cert.org/vuls/id/175148 US Government Resource
http://www.osvdb.org/28776
http://www.phenoelit.de/stuff/CiscoVTP.txt
http://www.securityfocus.com/archive/1/445896/100/0/threaded
http://www.securityfocus.com/archive/1/445938/100/0/threaded
http://www.securityfocus.com/bid/19998
http://www.vupen.com/english/advisories/2006/3600 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/28925

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2006-4775), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.