Is CVE-2009-2505 being actively exploited?

CVE-2009-2505 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2009-2505?

CVE-2009-2505 has a CVSS 2.0 base score of 10.0 (HIGH).

CVE-2009-2505

HIGH · CVSS 10.0EPSS 31.6%EU EUVD

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."

Key facts

CVSS score: 10.0 (v2.0)
Severity: HIGH
CVSS vector: AV:N/AC:L/Au:N/C:C/I:C/A:C
Weakness (CWE): CWE-287
EPSS score: 31.6% (98th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2009-2500)
Published: December 9, 2009
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2009-2500 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows vista

Certified products that may be affected

7 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Windows Vista Enhanced Cryptographic Provider (RSAENH) - Microsoft Corporation - FIPS 140 1002 - historical
Windows Vista Enhanced DSS and Diffie-Hellman Cryptographic Provider (DSSENH) - Microsoft Corporation - FIPS 140 1003 - historical
Windows Vista Boot Manager (bootmgr) - Microsoft Corporation - FIPS 140 978 - historical
Windows Vista Winload OS Loader (winload.exe) - Microsoft Corporation - FIPS 140 979 - historical
Windows Vista Code Integrity (ci.dll) - Microsoft Corporation - FIPS 140 980 - historical

See all 7 in the Security Certifications Explorer.

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

Query CVEs from your AI assistant

The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.

Add the CVE brain