CVE-2011-1271

High

Description

The JIT compiler in Microsoft .NET Framework 3.5 Gold and SP1, 3.5.1, and 4.0, when IsJITOptimizerDisabled is false, does not properly handle expressions related to null strings, which allows context-dependent attackers to bypass intended access restrictions, and consequently execute arbitrary code, in opportunistic circumstances by leveraging a crafted application, as demonstrated by (1) a crafted XAML browser application (aka XBAP), (2) a crafted ASP.NET application, or (3) a crafted .NET Framework application, aka ".NET Framework JIT Optimization Vulnerability."

SeverityHigh

CVSS7.7

Exploit probability—

Product

Microsoft .net Framework

PublishedMay 10, 2011

First seenMay 10, 2011

Weakness typeCWE-476NULL pointer dereference

How to fix

Vendor advisories

docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-044

Affected products

Product	Affected versions	Fixed in
microsoft .net_framework	4.0, 3.5.1, 2.0, 3.5	—

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