CVE-2021-33779
Windows AD FS Security Feature Bypass Vulnerability
8.1 High
Windows AD FS Security Feature Bypass Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
2.44%Up 2.0 points since Jul 15, 2021
What each source reports
CVE List Score used
Windows AD FS Security Feature Bypass Vulnerability
Windows AD FS Security Feature Bypass Vulnerability
- Record
CVE-2021-33779- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-20456
Windows AD FS Security Feature Bypass Vulnerability
- Record
EUVD-2021-20456- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-jgpr-7x8j-xjhf
Windows ADFS Security Feature Bypass Vulnerability
Windows ADFS Security Feature Bypass Vulnerability
- Record
GHSA-jgpr-7x8j-xjhf- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
NVD
Windows AD FS Security Feature Bypass Vulnerability
- Record
CVE-2021-33779- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N - CVSS 2.0
- 5.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:N - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-33779 is a high vulnerability (CVSS 8.1) in Microsoft Windows Server 2016, published July 14, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.44%, the 84th percentile. No source names a fixed version.