{"cve":"CVE-2009-2505","nvd":{"published":"2009-12-09T18:30:00.233","modified":"2026-06-16T23:09:36.060","status":"Modified","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.\"","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-287"],"references":["http://www.securitytracker.com/id?1023291","http://www.us-cert.gov/cas/techalerts/TA09-342A.html","https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-071","https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6063","http://www.securitytracker.com/id?1023291"],"products":["microsoft:windows_server_2008","microsoft:windows_vista"],"source":"nvd","synced_at":"2026-10-19T19:54:26.868835795+00:00"},"epss":{"cve":"CVE-2009-2505","score":0.31611,"percentile":0.98291,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}