CVE-2011-1271

Public Exploit

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."

Categories

7.7
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 3.68% Top 15%
Vendor Advisory microsoft.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12686 vdb entry signature
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-044 vendor advisory
http://stackoverflow.com/questions/2135509/bug-only-occurring-when-compile-optimization-enabled/ exploit

Frequently Asked Questions

What is the severity of CVE-2011-1271?
CVE-2011-1271 has been scored as a high severity vulnerability.
How to fix CVE-2011-1271?
To fix CVE-2011-1271, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2011-1271 being actively exploited in the wild?
It is possible that CVE-2011-1271 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~4% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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