CVE-2011-1271

mediumpriority · track · 37EPSS 0.201 · 97 %ileexploit · functionalEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · functional

Likely / severe?

20.1% (97th) EPSS

CVSS 5.1 · medium

Is it mine?

5 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

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."

cvss

Technical severity, 0–10. One row per scoring source.

7.7

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.1–7.7

v2.05.1mediumAV:N/AC:H/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 4.9 · impact 6.4

v3.17.7highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Lsecondary · ENISA EU

v3.17.7highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Lsecondaryexploitability 2.2 · impact 5.5

v3.17.3highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L/E:Psecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-264USprimaryCWE-476US

exploits (1)

Public proof-of-concept and weaponised exploit code.

EDB-35740Microsoft .NET Framework JIT Compiler - Optimization NULL String Remote Code Executionfunctional · exploit_db

affected products (5)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
microsoft .net framework= 2.0nvdUScpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*
microsoft .net framework= 3.5nvdUScpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*
microsoft .net framework= 3.5.1nvdUScpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*
microsoft .net framework= 4.0nvdUScpe:2.3:a:microsoft:.net_framework:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2011-05-10modified 2026-06-16

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+8950 more

references (9)

External citations — patches, advisories, analysis.

scry

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