{"id":"CVE-2011-0040","aliases":["EUVD-2011-0066","GHSA-9w6c-58mr-5mwx"],"status":"published","title":"The server in Microsoft Active Directory on Windows Server 2003 SP2 does not properly handle an...","description":"The server in Microsoft Active Directory on Windows Server 2003 SP2 does not properly handle an update request for a service principal name (SPN), which allows remote attackers to cause a denial of service (authentication downgrade or outage) via a crafted request that triggers name collisions, aka \"Active Directory SPN Validation Vulnerability.\"","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.2276,"percentile":0.97741,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20"],"published":"2011-02-09T00:00:00Z","modified":"2026-06-16T23:26:40Z","products":[{"vendor":"microsoft","product":"windows_2003_server"}],"references":[{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-005","tags":["vendor-advisory","x_refsource_MS","x_transferred"]},{"url":"http://osvdb.org/70825","tags":["vdb-entry","x_refsource_OSVDB","x_transferred"]},{"url":"http://www.vupen.com/english/advisories/2011/0319","tags":["vdb-entry","x_refsource_VUPEN","x_transferred","Vendor Advisory"]},{"url":"http://www.securitytracker.com/id?1025042","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred"]},{"url":"http://secunia.com/advisories/43215","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/64915","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"http://www.securityfocus.com/bid/46145","tags":["vdb-entry","x_refsource_BID","x_transferred"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12485","tags":["vdb-entry","signature","x_refsource_OVAL","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-0040"},{"url":"https://github.com/advisories/GHSA-9w6c-58mr-5mwx"}],"sources":{"cve":[{"id":"CVE-2011-0040","description":"The server in Microsoft Active Directory on Windows Server 2003 SP2 does not properly handle an update request for a service principal name (SPN), which allows remote attackers to cause a denial of service (authentication downgrade or outage) via a crafted request that triggers name collisions, aka \"Active Directory SPN Validation Vulnerability.\"","status":"published","published":"2011-02-09T00:00:00Z","modified":"2024-08-06T21:43:14.026Z","updated_at":"2026-11-02T14:35:39.079595Z"}],"euvd":[{"id":"EUVD-2011-0066","description":"The server in Microsoft Active Directory on Windows Server 2003 SP2 does not properly handle an update request for a service principal name (SPN), which allows remote attackers to cause a denial of service (authentication downgrade or outage) via a crafted request that triggers name collisions, aka \"Active Directory SPN Validation Vulnerability.\"","status":"published","published":"2011-02-09T00:00:00Z","modified":"2024-08-06T21:43:14Z","updated_at":"2026-11-03T01:56:01.523697Z"}],"ghsa":[{"id":"GHSA-9w6c-58mr-5mwx","title":"The server in Microsoft Active Directory on Windows Server 2003 SP2 does not properly handle an...","description":"The server in Microsoft Active Directory on Windows Server 2003 SP2 does not properly handle an update request for a service principal name (SPN), which allows remote attackers to cause a denial of service (authentication downgrade or outage) via a crafted request that triggers name collisions, aka \"Active Directory SPN Validation Vulnerability.\"","status":"published","published":"2022-05-03T03:25:29Z","modified":"2023-02-01T05:01:34Z","cwes":["CWE-20"],"updated_at":"2026-11-02T14:49:44.873647Z"}],"nvd":[{"id":"CVE-2011-0040","description":"The server in Microsoft Active Directory on Windows Server 2003 SP2 does not properly handle an update request for a service principal name (SPN), which allows remote attackers to cause a denial of service (authentication downgrade or outage) via a crafted request that triggers name collisions, aka \"Active Directory SPN Validation Vulnerability.\"","status":"published","published":"2011-02-09T01:00:08.15Z","modified":"2026-06-16T23:26:40.543Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:02:06.042049Z"}]}}