{"id":"CVE-2009-2505","aliases":["EUVD-2009-2500","GHSA-3vqg-cv53-whw6"],"status":"published","title":"The Internet Authentication Service (IAS) in Microsoft Windows Vista SP2 and Server 2008 SP2 does...","description":"The Internet Authentication Service (IAS) in Microsoft Windows Vista SP2 and Server 2008 SP2 does not properly validate MS-CHAP v2 Protected Extensible Authentication Protocol (PEAP) authentication requests, which allows remote attackers to execute arbitrary code via crafted structures in a malformed request, aka \"Internet Authentication Service Memory Corruption Vulnerability.\"","severity":{"version":"2.0","score":10,"vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.31611,"percentile":0.98302,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2009-12-09T18:00:00Z","modified":"2026-06-16T23:09:36Z","products":[{"vendor":"microsoft","product":"windows_server_2008"},{"vendor":"microsoft","product":"windows_vista"}],"references":[{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-071","tags":["vendor-advisory","x_refsource_MS","x_transferred"]},{"url":"http://www.us-cert.gov/cas/techalerts/TA09-342A.html","tags":["third-party-advisory","x_refsource_CERT","x_transferred","US Government Resource"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6063","tags":["vdb-entry","signature","x_refsource_OVAL","x_transferred"]},{"url":"http://www.securitytracker.com/id?1023291","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-2505"},{"url":"https://github.com/advisories/GHSA-3vqg-cv53-whw6"}],"sources":{"cve":[{"id":"CVE-2009-2505","description":"The Internet Authentication Service (IAS) in Microsoft Windows Vista SP2 and Server 2008 SP2 does not properly validate MS-CHAP v2 Protected Extensible Authentication Protocol (PEAP) authentication requests, which allows remote attackers to execute arbitrary code via crafted structures in a malformed request, aka \"Internet Authentication Service Memory Corruption Vulnerability.\"","status":"published","published":"2009-12-09T18:00:00Z","modified":"2024-08-07T05:52:14.912Z","updated_at":"2026-11-02T14:33:23.395558Z"}],"euvd":[{"id":"EUVD-2009-2500","description":"The Internet Authentication Service (IAS) in Microsoft Windows Vista SP2 and Server 2008 SP2 does not properly validate MS-CHAP v2 Protected Extensible Authentication Protocol (PEAP) authentication requests, which allows remote attackers to execute arbitrary code via crafted structures in a malformed request, aka \"Internet Authentication Service Memory Corruption Vulnerability.\"","status":"published","published":"2009-12-09T18:00:00Z","modified":"2024-08-07T05:52:14Z","updated_at":"2026-11-03T01:39:17.521372Z"}],"ghsa":[{"id":"GHSA-3vqg-cv53-whw6","title":"The Internet Authentication Service (IAS) in Microsoft Windows Vista SP2 and Server 2008 SP2 does...","description":"The Internet Authentication Service (IAS) in Microsoft Windows Vista SP2 and Server 2008 SP2 does not properly validate MS-CHAP v2 Protected Extensible Authentication Protocol (PEAP) authentication requests, which allows remote attackers to execute arbitrary code via crafted structures in a malformed request, aka \"Internet Authentication Service Memory Corruption Vulnerability.\"","status":"published","published":"2022-05-02T03:35:50Z","modified":"2023-01-31T05:08:48Z","cwes":["CWE-287"],"updated_at":"2026-11-02T14:49:27.100963Z"}],"nvd":[{"id":"CVE-2009-2505","description":"The Internet Authentication Service (IAS) in Microsoft Windows Vista SP2 and Server 2008 SP2 does not properly validate MS-CHAP v2 Protected Extensible Authentication Protocol (PEAP) authentication requests, which allows remote attackers to execute arbitrary code via crafted structures in a malformed request, aka \"Internet Authentication Service Memory Corruption Vulnerability.\"","status":"published","published":"2009-12-09T18:30:00.233Z","modified":"2026-06-16T23:09:36.06Z","cvss":[{"version":"2.0","score":10,"vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:01:37.939838Z"}]}}