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Unrated severityNVD Advisory· Published Dec 9, 2009· Updated Jun 16, 2026

CVE-2009-3677

CVE-2009-3677

Description

The Internet Authentication Service (IAS) in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold and SP1, and Server 2008 Gold does not properly verify the credentials in an MS-CHAP v2 Protected Extensible Authentication Protocol (PEAP) authentication request, which allows remote attackers to access network resources via a malformed request, aka "MS-CHAP Authentication Bypass Vulnerability."

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

12
  • Microsoft/Windows 2000
    cpe:2.3:o:microsoft:windows_2000:*:sp4:*:*:*:*:*:*
  • Microsoft/Windows Server 2003
    cpe:2.3:o:microsoft:windows_server_2003:*:sp2:*:*:*:*:*:*
  • Microsoft/Windows Server 20083 versions
    cpe:2.3:o:microsoft:windows_server_2008:*:*:itanium:*:*:*:*:*+ 2 more
    • cpe:2.3:o:microsoft:windows_server_2008:*:*:itanium:*:*:*:*:*
    • cpe:2.3:o:microsoft:windows_server_2008:*:*:x32:*:*:*:*:*
    • cpe:2.3:o:microsoft:windows_server_2008:*:*:x64:*:*:*:*:*
  • Microsoft/Windows3 versions
    cpe:2.3:o:microsoft:windows_vista:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:microsoft:windows_vista:*:*:*:*:*:*:*:*
    • cpe:2.3:o:microsoft:windows_vista:*:sp1:*:*:*:*:*:*
    • cpe:2.3:o:microsoft:windows_vista:*:*:x64:*:*:*:*:*
  • Microsoft/Windows Xp3 versions
    cpe:2.3:o:microsoft:windows_xp:*:sp2:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:microsoft:windows_xp:*:sp2:*:*:*:*:*:*
    • cpe:2.3:o:microsoft:windows_xp:-:sp2:x64:*:*:*:*:*
    • cpe:2.3:o:microsoft:windows_xp:*:sp3:*:*:*:*:*:*
  • Microsoft/Internet Authentication Servicellm-fuzzy

Patches

Vulnerability mechanics

References

4

News mentions

0

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