CVE-2009-2505
The Internet Authentication Service (IAS) in Microsoft Windows Vista SP2 and Server 2008 SP2 does...
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."
Exploit likelihood
What each source reports
NVD Score used
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."
- Record
CVE-2009-2505- CVSS 2.0
- 10.0 High
AV:N/AC:L/Au:N/C:C/I:C/A:C - Weakness
- CWE-287
- Updated
- 2026-11-02
CVE List No score
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."
- Record
CVE-2009-2505- Updated
- 2026-11-02
EUVDEUVD-2009-2500 No score
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."
- Record
EUVD-2009-2500- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-3vqg-cv53-whw6 No score
The Internet Authentication Service (IAS) in Microsoft Windows Vista SP2 and Server 2008 SP2 does...
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."
- Record
GHSA-3vqg-cv53-whw6- Weakness
- CWE-287
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2009-2505 is a high vulnerability (CVSS 10.0) in Microsoft Windows Vista, published December 9, 2009. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 31.6%, the 98th percentile. No source names a fixed version.
References
docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-071
us-cert.gov/cas/techalerts/TA09-342A.html
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6063
securitytracker.com/id?1023291
nvd.nist.gov/vuln/detail/CVE-2009-2505
github.com/advisories/GHSA-3vqg-cv53-whw6