Open redirect vulnerability in the Forms Authentication feature in the ASP.NET subsystem in Microsoft .NET Framework 2.0 SP2, 3.5 SP1, 3.5.1, and 4.0 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a crafted return URL, aka "Insecure Redirect in .NET Form Authentication Vulnerability."
Published Dec 30, 2011
6.8
MEDIUMCVSS 2.0
EPSS 22.95%
Description
Open redirect vulnerability in the Forms Authentication feature in the ASP.NET subsystem in Microsoft .NET Framework 2.0 SP2, 3.5 SP1, 3.5.1, and 4.0 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a crafted return URL, aka "Insecure Redirect in .NET Form Authentication 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:M/Au:N/C:P/I:P/A:P
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 (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 22.95% (0.22954) | 97.69th | v5 (v2026.06.15) |
| Aug 14, 2026 | 22.95% (0.22954) | 97.55th | v5 (v2026.06.15) |
| Jun 15, 2026 | 24.14% (0.24138) | 97.56th | v5 (v2026.06.15) |
| Dec 28, 2025 | 44.11% (0.44113) | 97.41th | v4 (v2025.03.14) |
| Dec 27, 2025 | 48.86% (0.48863) | 97.67th | v4 (v2025.03.14) |
| Oct 28, 2025 | 44.11% (0.44113) | 97.38th | v4 (v2025.03.14) |
| Oct 27, 2025 | 48.86% (0.48863) | 97.63th | v4 (v2025.03.14) |
| Oct 1, 2025 | 44.11% (0.44113) | 97.47th | v4 (v2025.03.14) |
| Mar 30, 2025 | 48.86% (0.48863) | 97.53th | v4 (v2025.03.14) |
| Mar 29, 2025 | 50.67% (0.50674) | 96.85th | v4 (v2025.03.14) |
| Mar 17, 2025 | 48.86% (0.48863) | 97.49th | v4 (v2025.03.14) |
| Mar 1, 2025 | 53.14% (0.53139) | 97.81th | v3 (v2023.03.01) |
| Nov 24, 2023 | 60.53% (0.60526) | 97.46th | v3 (v2023.03.01) |
| Jul 29, 2023 | 64.03% (0.64032) | 97.39th | v3 (v2023.03.01) |
| May 26, 2023 | 67.33% (0.67331) | 97.44th | v3 (v2023.03.01) |
| Mar 24, 2023 | 79.48% (0.79485) | 97.73th | v3 (v2023.03.01) |
| Mar 7, 2023 | 82.01% (0.82008) | 97.78th | v3 (v2023.03.01) |
| Mar 6, 2023 | 35.17% (0.35170) | 97.80th | v2 (v2022.01.01) |
| Feb 4, 2022 | 35.17% (0.35170) | 96.78th | v2 (v2022.01.01) |
References (5)
- http://jvn.jp/en/jp/JVN71256611/index.html third-party-advisoryx_refsource_JVN
- http://jvndb.jvn.jp/jvndb/JVNDB-2011-003557 third-party-advisoryx_refsource_JVNDB
- http://www.securityfocus.com/bid/51202 vdb-entryx_refsource_BID
- 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%3A14815 vdb-entrysignaturex_refsource_OVAL
| Link | Providers | Tags |
|---|---|---|
| http://jvn.jp/en/jp/JVN71256611/index.html | third-party-advisoryx_refsource_JVN | |
| http://jvndb.jvn.jp/jvndb/JVNDB-2011-003557 | third-party-advisoryx_refsource_JVNDB | |
| http://www.securityfocus.com/bid/51202 | vdb-entryx_refsource_BID | |
| 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%3A14815 | vdb-entrysignaturex_refsource_OVAL |
Change history (0)
No recorded changes yet.