CVE-2006-4775

Severity: high (CVSS 7.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2006-09-14 · updated 2026-06-16
Weakness: CWE-399

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.

Affected products

Cisco Catos: all versions
Cisco IOS: 12.1(19)

References

http://secunia.com/advisories/21896
http://secunia.com/advisories/21902
http://securitytracker.com/id?1016843
http://www.cisco.com/warp/public/707/cisco-sr-20060913-vtp.shtml
http://www.kb.cert.org/vuls/id/175148
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
https://exchange.xforce.ibmcloud.com/vulnerabilities/28925

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