{"id":"CVE-2009-2505","url":"https://www.cyber-defence.io/tools/cve/CVE-2009-2505","generatedAt":"2026-10-27T17:39:14.241Z","title":"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…","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.\"","published":"2009-12-09T18:30:00.000Z","lastModified":"2026-06-16T23:09:36.000Z","status":"Modified","sourceIdentifier":"secure@microsoft.com","cvss":{"version":"2.0","score":10,"severity":"HIGH","vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C"},"cwe":["CWE-287"],"affected":["microsoft/windows server 2008","microsoft/windows vista"],"epss":{"score":0.31611,"percentile":0.98278,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 31.6%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://www.securitytracker.com/id?1023291","source":"secure@microsoft.com"},{"url":"http://www.us-cert.gov/cas/techalerts/TA09-342A.html","tags":["US Government Resource"],"source":"secure@microsoft.com"},{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-071","source":"secure@microsoft.com"},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6063","source":"secure@microsoft.com"},{"url":"http://www.securitytracker.com/id?1023291","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.us-cert.gov/cas/techalerts/TA09-342A.html","tags":["US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-071","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6063","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2009-2505","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}