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CVE-2011-1271

7.7 · HIGH

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 conte…

Published May 10, 2011microsoftCWE-264EPSS 20.10%

Overview

CVE-2011-1271 is a high-severity vulnerability affecting microsoft .net_framework. It was published on May 10, 2011 and has a CVSS 3.1 base score of 7.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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."

Remediation

Check the references section for vendor advisories and patches from microsoft. Update .net_framework to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refstackoverflow.com/questions/2135509/bug-only-occurring-when-compile-optimization-enabled/Refdocs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-044Refoval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12686Refstackoverflow.com/questions/2135509/bug-only-occurring-when-compile-optimization-enabled/Refdocs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-044Refoval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12686

How CyberStrike helps

Frequently asked questions

What is CVE-2011-1271?

CVE-2011-1271 is a high-severity vulnerability affecting microsoft .net_framework. It was published on May 10, 2011 and has a CVSS 3.1 base score of 7.7 (HIGH).

How severe is CVE-2011-1271?

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2011-1271?

Check the references section for vendor advisories and patches from microsoft. Update .net_framework to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2011-1271?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2011-1271 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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