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Active Directory Federation Services

CVE-2021-41361 — Active Directory Federation Server Spoofing Vulnerability

Important CVSS 5.4 EPSS 0.00899 2021-10 archive

Executive Summary

None

Overview

5.4
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Spoofing
Released Oct 12 2021
Last Updated Oct 12 2021
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00899 — 0.5489 percentile
NVD CVSS 5.4 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
Required
SCOPE
Changed
CONFIDENTIALITY
Low
INTEGRITY
Low
AVAILABILITY
None
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 4.7

EPSS Score

0.00899
probability of exploitation in the next 30 days
0.5489 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

8 affected products
Product KB Article Severity Impact Restart Required
Windows Server 2016 5006669 (Security Update) Important Spoofing Yes
Windows Server 2016 (Server Core installation) 5006669 (Security Update) Important Spoofing Yes
Windows Server 2019 5006672 (Security Update) Important Spoofing Yes
Windows Server 2019 (Server Core installation) 5006672 (Security Update) Important Spoofing Yes
Windows Server 2022 5006699 (Security Update) Important Spoofing Yes
Windows Server 2022 (Server Core installation) 5006699 (Security Update) Important Spoofing Yes
Windows Server, version 2004 (Server Core installation) 5006670 (Security Update) Important Spoofing Yes
Windows Server, version 20H2 (Server Core Installation) 5006670 (Security Update) Important Spoofing Yes

Patches

4 patches
Article Type Restart
5006669 Security Update Yes
5006672 Security Update Yes
5006699 Security Update Yes
5006670 Security Update Yes

Known Exploits

Acknowledgments

Nadish Shajahan

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