CVE-2009-0091 Code injection in n/a

What is CVE-2009-0091?

CVE-2009-0091 is a critical code injection vulnerability in Microsoft .Net Framework, published on 14 Oct 2009. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official 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."

Weakness: CWE-94

Which versions are affected by CVE-2009-0091?

It affects 7 products.

Products include Microsoft .Net Framework, Microsoft Windows 2000, Microsoft Windows 7, Microsoft Windows Server 2003, Microsoft Windows Server 2008, Microsoft Windows Vista and 1 more.

How do I fix CVE-2009-0091?

No fix has been published for CVE-2009-0091 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2009-0091 being exploited?

There is no known exploitation of CVE-2009-0091 in the wild and no public exploit code.

Other vulnerabilities in Microsoft .Net Framework

• CVE-2020-0646 Microsoft .NET Framework Remote Code Execution Exploited Critical 9.8
• CVE-2017-8759 Microsoft .NET Framework Remote Code Execution Exploited High 7.8
• CVE-2015-1671 Microsoft Windows Remote Code Execution Exploited High 7.8
• CVE-2024-29059 Microsoft .NET Framework Information Disclosure Exploited High 7.5
• CVE-2014-4073 Privilege escalation in n/a Critical 10.0

All Microsoft .Net Framework vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-ccxf-7q2f-693x.