A security feature bypass vulnerability exists when Active Directory Federation Services (AD FS) improperly handles multi-factor authentication requests, aka "AD FS Security Feature Bypass Vulnerability." This affects Windows Server 2016, Windows Server 2012 R2, Windows 10 Servers
Published Aug 15, 2018
6.5
MEDIUMCVSS 3.0
EPSS 7.58%
Description
A security feature bypass vulnerability exists when Active Directory Federation Services (AD FS) improperly handles multi-factor authentication requests, aka "AD FS Security Feature Bypass Vulnerability." This affects Windows Server 2016, Windows Server 2012 R2, Windows 10 Servers.
Affected products
-
- Version version 1709 (Server Core Installation)StatusaffectedConstraints-
- Version version 1803 (Server Core Installation)StatusaffectedConstraints-
- Version
-
- Version (Server Core installation)StatusaffectedConstraints-
- Version
-
- Version (Server Core installation)StatusaffectedConstraints-
- 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 | Windows 10 Servers | n/a |
| |||||||||
| Microsoft | Windows Server 2012 R2 | n/a |
| |||||||||
| Microsoft | Windows Server 2016 | n/a |
|
- r2
- n/a
- 1709
- 1803
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.
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
AV:N/AC:L/Au:S/C:P/I:N/A:N
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
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (23 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 7.58% (0.07584) | 94.35th | v5 (v2026.06.15) |
| Jun 15, 2026 | 7.58% (0.07584) | 93.74th | v5 (v2026.06.15) |
| May 7, 2026 | 19.37% (0.19369) | 95.41th | v4 (v2025.03.14) |
| Mar 1, 2026 | 15.22% (0.15224) | 94.50th | v4 (v2025.03.14) |
| Jan 31, 2026 | 12.75% (0.12755) | 93.81th | v4 (v2025.03.14) |
| Dec 7, 2025 | 14.63% (0.14628) | 94.20th | v4 (v2025.03.14) |
| Aug 9, 2025 | 11.32% (0.11319) | 93.25th | v4 (v2025.03.14) |
| Mar 30, 2025 | 6.93% (0.06930) | 90.53th | v4 (v2025.03.14) |
| Mar 29, 2025 | 15.35% (0.15350) | 91.09th | v4 (v2025.03.14) |
| Mar 17, 2025 | 10.49% (0.10488) | 92.68th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.10% (0.00104) | 44.00th | v3 (v2023.03.01) |
| May 30, 2024 | 0.10% (0.00104) | 42.34th | v3 (v2023.03.01) |
| Apr 3, 2024 | 0.12% (0.00123) | 45.99th | v3 (v2023.03.01) |
| Jan 6, 2024 | 0.12% (0.00117) | 45.36th | v3 (v2023.03.01) |
| Dec 21, 2023 | 0.14% (0.00142) | 49.94th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.14% (0.00140) | 47.94th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.39% (0.02391) | 81.49th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.39% (0.02391) | 79.73th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.39% (0.02391) | 58.37th | v2 (v2022.01.01) |
| Feb 3, 2022 | 8.76% (0.08756) | 86.41th | v1 |
| Jan 6, 2022 | 8.76% (0.08756) | 86.25th | v1 |
| Sep 1, 2021 | 8.76% (0.08756) | 93.70th | v1 |
| Apr 14, 2021 | 8.76% (0.08756) | 0.00th | v1 |
No CWE recorded.
References (3)
- http://www.securityfocus.com/bid/105029 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1041474 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8340 x_refsource_CONFIRMPatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/105029 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1041474 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8340 | x_refsource_CONFIRMPatchVendor Advisory |
Change history (0)
No recorded changes yet.