CVE-2011-1271 EXPLOIT
7.7
HIGH · CVSS 3.1 · EPSS 20.1% (pctl 97)
Patch early
A public exploit exists.
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."
Scoring
| CVSS | 7.7 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L |
| EPSS | 20.1% — more likely to be exploited than 97% of all CVEs |
| Weakness | CWE-264 |
| On CISA KEV | no |
| Public exploit | yes |
| Published | 2011-05-10 |
| Last modified | 2026-06-16 |
Affected (7)
| Vendor | Product |
|---|---|
| microsoft | .net framework |
| microsoft | windows 2003 server |
| microsoft | windows 7 |
| microsoft | windows server 2003 |
| microsoft | windows server 2008 |
| microsoft | windows vista |
| microsoft | windows xp |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | Microsoft .NET Framework JIT Compiler - Optimization NULL String Remote Code Execution | 2011-03-04 |
References
- http://stackoverflow.com/questions/2135509/bug-only-occurring-when-compile-optimization-enabled/
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-044
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12686
- http://stackoverflow.com/questions/2135509/bug-only-occurring-when-compile-optimization-enabled/
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-044
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12686
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