What’s Vulnerable › Vulnerabilities

CVE-2009-2505

• Severity: critical (CVSS 10.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 31.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2009-12-09 · updated 2026-06-16
• Weakness: CWE-287

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."

Affected products

• Microsoft Windows Server 2008: sp2-x32, sp2-x64
• Microsoft Windows Vista: all versions

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
• 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

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