CVE-2009-2505: Microsoft Windows Server 2008
High severity, CVSS 10.0. EPSS: 31.6% chance of exploitation in the next 30 days.
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."
Affected products
Published 2009-12-09. Last modified 2026-06-16.