The CaseInsensitiveHashProvider.getHashCode function in the HashTable implementation in the ASP.NET subsystem in Microsoft .NET Framework 1.1 SP1, 2.0 SP2, 3.5 SP1, 3.5.1, and 4.0 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters, aka "Collisions in HashTable May Cause DoS Vulnerability."
Published Dec 30, 2011
7.8
HIGHCVSS 2.0
EPSS 57.69%
Description
The CaseInsensitiveHashProvider.getHashCode function in the HashTable implementation in the ASP.NET subsystem in Microsoft .NET Framework 1.1 SP1, 2.0 SP2, 3.5 SP1, 3.5.1, and 4.0 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters, aka "Collisions in HashTable May Cause DoS Vulnerability."
Affected products
No data.
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- r2
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- sp3
No data.
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.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
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 (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 57.69% (0.57687) | 99.06th | v5 (v2026.06.15) |
| Aug 14, 2026 | 57.69% (0.57687) | 99.00th | v5 (v2026.06.15) |
| Jun 15, 2026 | 58.89% (0.58895) | 98.99th | v5 (v2026.06.15) |
| Oct 18, 2025 | 71.97% (0.71970) | 98.67th | v4 (v2025.03.14) |
| Mar 30, 2025 | 76.67% (0.76674) | 98.89th | v4 (v2025.03.14) |
| Mar 29, 2025 | 81.11% (0.81107) | 98.92th | v4 (v2025.03.14) |
| Mar 17, 2025 | 76.67% (0.76674) | 98.90th | v4 (v2025.03.14) |
| Dec 12, 2024 | 96.13% (0.96134) | 99.58th | v3 (v2023.03.01) |
| Jun 29, 2024 | 96.42% (0.96421) | 99.58th | v3 (v2023.03.01) |
| May 7, 2024 | 96.65% (0.96649) | 99.63th | v3 (v2023.03.01) |
| Mar 13, 2024 | 96.91% (0.96915) | 99.69th | v3 (v2023.03.01) |
| Mar 7, 2023 | 96.70% (0.96696) | 99.36th | v3 (v2023.03.01) |
| Mar 6, 2023 | 46.65% (0.46653) | 98.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 46.65% (0.46653) | 97.92th | v2 (v2022.01.01) |
References (7)
- http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html mailing-listx_refsource_BUGTRAQ
- http://www.kb.cert.org/vuls/id/903934 third-party-advisoryx_refsource_CERT-VNUS Government Resource
- http://www.nruns.com/_downloads/advisory28122011.pdf x_refsource_MISC
- http://www.ocert.org/advisories/ocert-2011-003.html x_refsource_MISC
- http://www.us-cert.gov/cas/techalerts/TA11-347A.html third-party-advisoryx_refsource_CERTUS Government Resource
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-100 vendor-advisoryx_refsource_MS
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14588 vdb-entrysignaturex_refsource_OVAL
| Link | Providers | Tags |
|---|---|---|
| http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html | mailing-listx_refsource_BUGTRAQ | |
| http://www.kb.cert.org/vuls/id/903934 | third-party-advisoryx_refsource_CERT-VNUS Government Resource | |
| http://www.nruns.com/_downloads/advisory28122011.pdf | x_refsource_MISC | |
| http://www.ocert.org/advisories/ocert-2011-003.html | x_refsource_MISC | |
| http://www.us-cert.gov/cas/techalerts/TA11-347A.html | third-party-advisoryx_refsource_CERTUS Government Resource | |
| https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-100 | vendor-advisoryx_refsource_MS | |
| https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14588 | vdb-entrysignaturex_refsource_OVAL |
Change history (0)
No recorded changes yet.