VULNERABILITY INTELLIGENCE
CVE-2009-2505
CVSS score10 HIGH
EPSS probability31.61%
CISA KEVNot currently listed
Published2009-12-09
Last modified2026-06-16
CVSS vectorAV:N/AC:L/Au:N/C:C/I:C/A:C
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."
Weakness classification
- CWE-287: Improper Authentication