{"id":"CVE-2009-0091","aliases":["EUVD-2009-0100","GHSA-ccxf-7q2f-693x"],"status":"published","title":"Microsoft .NET Framework 2.0, 2.0 SP1, and 3.5 does not properly enforce a certain type-equality...","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.\"","severity":{"version":"2.0","score":9.3,"vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.25811,"percentile":0.97988,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-94"],"published":"2009-10-14T10:00:00Z","modified":"2026-06-16T23:04:14Z","products":[{"vendor":"microsoft","product":".net_framework"},{"vendor":"microsoft","product":"windows_2000"},{"vendor":"microsoft","product":"windows_7"},{"vendor":"microsoft","product":"windows_server_2003"},{"vendor":"microsoft","product":"windows_server_2008"},{"vendor":"microsoft","product":"windows_vista"},{"vendor":"microsoft","product":"windows_xp"}],"references":[{"url":"http://www.us-cert.gov/cas/techalerts/TA09-286A.html","tags":["third-party-advisory","x_refsource_CERT","x_transferred","US Government Resource"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6451","tags":["vdb-entry","signature","x_refsource_OVAL","x_transferred"]},{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-061","tags":["vendor-advisory","x_refsource_MS","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-0091"},{"url":"https://github.com/advisories/GHSA-ccxf-7q2f-693x"}],"sources":{"cve":[{"id":"CVE-2009-0091","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.\"","status":"published","published":"2009-10-14T10:00:00Z","modified":"2024-08-07T04:24:17.083Z","updated_at":"2026-11-02T14:33:26.302774Z"}],"euvd":[{"id":"EUVD-2009-0100","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.\"","status":"published","published":"2009-10-14T10:00:00Z","modified":"2024-08-07T04:24:17Z","updated_at":"2026-11-03T01:39:27.128816Z"}],"ghsa":[{"id":"GHSA-ccxf-7q2f-693x","title":"Microsoft .NET Framework 2.0, 2.0 SP1, and 3.5 does not properly enforce a certain type-equality...","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.\"","status":"published","published":"2022-05-02T03:12:46Z","modified":"2023-01-31T05:07:00Z","cwes":["CWE-94"],"updated_at":"2026-11-02T14:49:07.796746Z"}],"nvd":[{"id":"CVE-2009-0091","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.\"","status":"published","published":"2009-10-14T10:30:00.483Z","modified":"2026-06-16T23:04:14.79Z","cvss":[{"version":"2.0","score":9.3,"vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-94"],"updated_at":"2026-11-02T14:01:37.004244Z"}]}}