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Vulnerability record · CVE-2006-4776 · published 14 September 2006

CVE-2006-4776: Cisco ios memory buffer overflow vulnerability

Cisco · Ios

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.

7.5 CVSS 2.0 High EPSS 7.8% · top 5.5% CWE-119 · Memory buffer overflow
7.5CVSS 2.0 base score
7.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
24References
16 Jun 2026Last modified by NVD

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.

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

Affected products

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

References

LinkTags
http://secunia.com/advisories/21896 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/542108 US Government Resource
http://www.osvdb.org/28777
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
http://www.vupen.com/english/advisories/2006/3601 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/28927
http://secunia.com/advisories/21896 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/542108 US Government Resource
http://www.osvdb.org/28777
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
http://www.vupen.com/english/advisories/2006/3601 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/28927

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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-2006-4776), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.