Is CVE-2009-2509 being actively exploited?

CVE-2009-2509 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2009-2509?

CVE-2009-2509 has a CVSS 2.0 base score of 9.0 (HIGH).

CVE-2009-2509

HIGH · CVSS 9.0EPSS 17.1%EU EUVD

Active Directory Federation Services (ADFS) in Microsoft Windows Server 2003 SP2 and Server 2008 Gold and SP2 does not properly validate headers in HTTP requests, which allows remote authenticated users to execute arbitrary code via a crafted request to an IIS web server, aka "Remote Code Execution in ADFS Vulnerability."

Key facts

CVSS score: 9.0 (v2.0)
Severity: HIGH
CVSS vector: AV:N/AC:L/Au:S/C:C/I:C/A:C
Weakness (CWE): CWE-20
EPSS score: 17.1% (97th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2009-2504)
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-2009-2504 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

microsoft / windows server 2003
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows server 2008

Certified products that may be affected

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

Microsoft Windows Server 2003 SP2 including R2, Standard, Enterprise, Datacenter, x64, and Itanium Editions; Windows XP Professional SP2 and x64 SP2; Windows XP Embedded SP2 - Microsoft Corporation - Common Criteria CCEVS-VR-VID-10184-2008 - archived

References

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

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