CVE-2009-2505 in the critical feed json
The Internet Authentication Service (IAS) in Microsoft Windows Vista SP2 and Server 2008 SP2 does not properly validate MS-CHAP v2 Protecte…
published 2009-12-09 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-2500
- cvss
- 10.0
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 31.6%
- EPSS 31.6% chance of exploitation in 30 days, percentile 98%
- public exploits
- 0
- none known
Summary
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 prediction
31.61% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 10.0 | AV:N/AC:L/Au:N/C:C/I:C/A:C |
Classification
- Weakness
-
- CWE-287 Improper Authentication
References
-
docs.microsoft.com
/en-us/security-updates/securitybulletins/2009/ms09-071
vendor-advisory
-
us-cert.gov
/cas/techalerts/TA09-342A.html
third-party-advisory, us-government-resource
-
oval.cisecurity.org
/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6063
vdb-entry, signature
-
securitytracker.com
/id?1023291
vdb-entry
Sources
- CVE List CVE-2009-2505
- NVD CVE-2009-2505
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.