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Vulnerability record · CVE-2009-0091 · published 14 October 2009

CVE-2009-0091: Microsoft windows 2000 code injection vulnerability

Microsoft · Windows 2000

Microsoft .NET Framework 2.0, 2.0 SP1, and 3.5 does not properly enforce a certain type-equality constraint in .NET verifiable code, which allows remote attackers to execute arbitrary code via (1) a crafted XAML browser application (XBAP), (2) a crafted ASP.NET application, or (3) a crafted .NET Framework application, aka "Microsoft .NET Framework Type Verification Vulnerability."

9.3 CVSS 2.0 High EPSS 26% · top 2.1% CWE-94 · Code injection
9.3CVSS 2.0 base score
26%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

Description

Microsoft .NET Framework 2.0, 2.0 SP1, and 3.5 does not properly enforce a certain type-equality constraint in .NET verifiable code, which allows remote attackers to execute arbitrary code via (1) a crafted XAML browser application (XBAP), (2) a crafted ASP.NET application, or (3) a crafted .NET Framework application, aka "Microsoft .NET Framework Type Verification Vulnerability."

AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

7 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.us-cert.gov/cas/techalerts/TA09-286A.html US Government Resource
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-061
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6451
http://www.us-cert.gov/cas/techalerts/TA09-286A.html US Government Resource
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-061
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6451

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2009-0091), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.