{"id":"CVE-2006-4775","aliases":["EUVD-2006-4762","GHSA-w58x-5ghh-784p"],"status":"published","title":"The VLAN Trunking Protocol (VTP) feature in Cisco IOS 12.1(19) and CatOS allows remote attackers...","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.","severity":{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.05142,"percentile":0.92459,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-399"],"published":"2006-09-14T00:00:00Z","modified":"2026-06-16T22:29:46Z","products":[{"vendor":"cisco","product":"catos"},{"vendor":"cisco","product":"ios"}],"references":[{"url":"http://www.phenoelit.de/stuff/CiscoVTP.txt","tags":["x_refsource_MISC","x_transferred"]},{"url":"http://secunia.com/advisories/21896","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory"]},{"url":"http://www.securityfocus.com/bid/19998","tags":["vdb-entry","x_refsource_BID","x_transferred"]},{"url":"http://www.osvdb.org/28776","tags":["vdb-entry","x_refsource_OSVDB","x_transferred"]},{"url":"http://www.cisco.com/warp/public/707/cisco-sr-20060913-vtp.shtml","tags":["vendor-advisory","x_refsource_CISCO","x_transferred","Patch"]},{"url":"http://securitytracker.com/id?1016843","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred"]},{"url":"http://www.securityfocus.com/archive/1/445938/100/0/threaded","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"]},{"url":"http://www.vupen.com/english/advisories/2006/3600","tags":["vdb-entry","x_refsource_VUPEN","x_transferred","Vendor Advisory"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/28925","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"http://www.kb.cert.org/vuls/id/175148","tags":["third-party-advisory","x_refsource_CERT-VN","x_transferred","US Government Resource"]},{"url":"http://www.securityfocus.com/archive/1/445896/100/0/threaded","tags":["mailing-list","x_refsource_BUGTRAQ","x_transferred"]},{"url":"http://secunia.com/advisories/21902","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2006-4775"},{"url":"https://github.com/advisories/GHSA-w58x-5ghh-784p"}],"sources":{"cve":[{"id":"CVE-2006-4775","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.","status":"published","published":"2006-09-14T00:00:00Z","modified":"2024-08-07T19:23:40.975Z","updated_at":"2026-11-02T14:33:50.738595Z"}],"euvd":[{"id":"EUVD-2006-4762","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.","status":"published","published":"2006-09-14T00:00:00Z","modified":"2024-08-07T19:23:40Z","updated_at":"2026-11-03T01:15:50.798383Z"}],"ghsa":[{"id":"GHSA-w58x-5ghh-784p","title":"The VLAN Trunking Protocol (VTP) feature in Cisco IOS 12.1(19) and CatOS allows remote attackers...","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.","status":"published","published":"2022-05-01T07:22:02Z","modified":"2023-01-31T05:02:15Z","updated_at":"2026-11-02T14:48:13.510148Z"}],"nvd":[{"id":"CVE-2006-4775","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.","status":"published","published":"2006-09-14T00:07:00Z","modified":"2026-06-16T22:29:46.357Z","cvss":[{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-399"],"updated_at":"2026-11-02T14:01:06.675668Z"}]}}