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."
Published May 10, 2011
7.7
HIGHCVSS 3.1
EPSS 20.10%
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."
Affected products
No data.
Configuration 1
- 4.0
Running on/with
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- r2
- r2
- n/a
- n/a
- n/a
- n/a
Configuration 2
- 3.5.1
Running on/with
- n/a
- n/a
- n/a
- r2
- r2
Configuration 3
- 2.0
Running on/with
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
Configuration 4
- 3.5
Running on/with
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
Configuration 5
- 2.0
Running on/with
- n/a
- n/a
- n/a
- n/a
Configuration 6
- 3.5
Running on/with
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
-
- Version 3.5 GoldStatusaffectedConstraints-
- Version 3.5 SP1StatusaffectedConstraints-
- Version 3.5.1StatusaffectedConstraints-
- Version 4.0StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | n/a | n/a |
|
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
No CVSS v3.0 score for this CVE.
AV:N/AC:H/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Jan 10, 2024 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (18 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 20.10% (0.20096) | 97.38th | v5 (v2026.06.15) |
| Jun 15, 2026 | 20.10% (0.20096) | 97.11th | v5 (v2026.06.15) |
| Apr 7, 2026 | 13.61% (0.13606) | 94.22th | v4 (v2025.03.14) |
| Dec 28, 2025 | 16.42% (0.16420) | 94.66th | v4 (v2025.03.14) |
| Dec 27, 2025 | 5.29% (0.05295) | 89.74th | v4 (v2025.03.14) |
| Oct 28, 2025 | 16.42% (0.16420) | 94.58th | v4 (v2025.03.14) |
| Oct 27, 2025 | 5.29% (0.05295) | 89.58th | v4 (v2025.03.14) |
| Oct 1, 2025 | 16.42% (0.16420) | 94.67th | v4 (v2025.03.14) |
| Mar 30, 2025 | 4.60% (0.04597) | 88.22th | v4 (v2025.03.14) |
| Mar 29, 2025 | 7.55% (0.07550) | 86.09th | v4 (v2025.03.14) |
| Mar 19, 2025 | 4.60% (0.04597) | 87.91th | v4 (v2025.03.14) |
| Mar 17, 2025 | 3.47% (0.03468) | 86.76th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.75% (0.00746) | 81.60th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.75% (0.00746) | 80.33th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.75% (0.00746) | 78.00th | v3 (v2023.03.01) |
| Mar 6, 2023 | 19.23% (0.19232) | 96.38th | v2 (v2022.01.01) |
| Apr 12, 2022 | 19.23% (0.19232) | 96.06th | v2 (v2022.01.01) |
| Feb 4, 2022 | 23.25% (0.23254) | 94.69th | v2 (v2022.01.01) |
References (3)
- http://stackoverflow.com/questions/2135509/bug-only-occurring-when-compile-optimization-enabled/ x_refsource_MISCExploit
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-044 vendor-advisoryx_refsource_MS
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12686 vdb-entrysignaturex_refsource_OVAL
| Link | Providers | Tags |
|---|---|---|
| http://stackoverflow.com/questions/2135509/bug-only-occurring-when-compile-optimization-enabled/ | x_refsource_MISCExploit | |
| https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-044 | vendor-advisoryx_refsource_MS | |
| https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12686 | vdb-entrysignaturex_refsource_OVAL |
Change history (0)
No recorded changes yet.