{"id":"CVE-2011-0091","aliases":["EUVD-2011-0117","GHSA-49wj-vp5r-r79v"],"status":"published","title":"Kerberos in Microsoft Windows Server 2008 R2 and Windows 7 does not prevent a session from...","description":"Kerberos in Microsoft Windows Server 2008 R2 and Windows 7 does not prevent a session from changing from strong encryption to DES encryption, which allows man-in-the-middle attackers to spoof network traffic and obtain sensitive information via a DES downgrade, aka \"Kerberos Spoofing Vulnerability.\"","severity":{"version":"2.0","score":6.4,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.05486,"percentile":0.92825,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2011-02-10T15:00:00Z","modified":"2026-06-16T23:26:47Z","products":[{"vendor":"microsoft","product":"windows_7"},{"vendor":"microsoft","product":"windows_server_2008"}],"references":[{"url":"http://www.securityfocus.com/bid/46140","tags":["vdb-entry","x_refsource_BID","x_transferred"]},{"url":"http://osvdb.org/70835","tags":["vdb-entry","x_refsource_OSVDB","x_transferred"]},{"url":"http://support.avaya.com/css/P8/documents/100127250","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"http://secunia.com/advisories/43257","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/64901","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-013","tags":["vendor-advisory","x_refsource_MS","x_transferred"]},{"url":"http://www.vupen.com/english/advisories/2011/0326","tags":["vdb-entry","x_refsource_VUPEN","x_transferred"]},{"url":"http://www.securitytracker.com/id?1025048","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12498","tags":["vdb-entry","signature","x_refsource_OVAL","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-0091"},{"url":"https://github.com/advisories/GHSA-49wj-vp5r-r79v"}],"sources":{"cve":[{"id":"CVE-2011-0091","description":"Kerberos in Microsoft Windows Server 2008 R2 and Windows 7 does not prevent a session from changing from strong encryption to DES encryption, which allows man-in-the-middle attackers to spoof network traffic and obtain sensitive information via a DES downgrade, aka \"Kerberos Spoofing Vulnerability.\"","status":"published","published":"2011-02-10T15:00:00Z","modified":"2024-08-06T21:43:14.614Z","updated_at":"2026-11-02T14:35:39.079595Z"}],"euvd":[{"id":"EUVD-2011-0117","description":"Kerberos in Microsoft Windows Server 2008 R2 and Windows 7 does not prevent a session from changing from strong encryption to DES encryption, which allows man-in-the-middle attackers to spoof network traffic and obtain sensitive information via a DES downgrade, aka \"Kerberos Spoofing Vulnerability.\"","status":"published","published":"2011-02-10T15:00:00Z","modified":"2024-08-06T21:43:14Z","updated_at":"2026-11-03T01:56:01.523697Z"}],"ghsa":[{"id":"GHSA-49wj-vp5r-r79v","title":"Kerberos in Microsoft Windows Server 2008 R2 and Windows 7 does not prevent a session from...","description":"Kerberos in Microsoft Windows Server 2008 R2 and Windows 7 does not prevent a session from changing from strong encryption to DES encryption, which allows man-in-the-middle attackers to spoof network traffic and obtain sensitive information via a DES downgrade, aka \"Kerberos Spoofing Vulnerability.\"","status":"published","published":"2022-05-14T02:13:36Z","modified":"2023-02-02T05:05:09Z","cwes":["CWE-287"],"updated_at":"2026-11-02T14:52:02.518349Z"}],"nvd":[{"id":"CVE-2011-0091","description":"Kerberos in Microsoft Windows Server 2008 R2 and Windows 7 does not prevent a session from changing from strong encryption to DES encryption, which allows man-in-the-middle attackers to spoof network traffic and obtain sensitive information via a DES downgrade, aka \"Kerberos Spoofing Vulnerability.\"","status":"published","published":"2011-02-10T16:00:13.723Z","modified":"2026-06-16T23:26:47.467Z","cvss":[{"version":"2.0","score":6.4,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:02:06.042049Z"}]}}