CVE-2021-36942 — Windows LSA Spoofing Vulnerability

Executive Summary

None

Overview

7.5

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

More Likely

MS Exploit Likelihood

Category Spoofing

Released Aug 10 2021

Last Updated Aug 10 2021

Publicly Disclosed Yes

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.66023 — 0.99176 percentile

NVD CVSS 7.5 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

None

AVAILABILITY

None

EXPLOIT CODE MATURITY

Functional

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 7.0

EPSS Score

0.66023

probability of exploitation in the next 30 days

0.99176 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

6 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows Server 2008 for 32-bit Systems Service Pack 2 5005090 (Monthly Rollup) 5005095 (Security Only) Important Spoofing 5004305 Base: 7.5 Temporal: 7.0 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.0.6003.21192 Yes 5005090 5005095 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5005090 (Monthly Rollup) 5005095 (Security Only) Important Spoofing 5004305 Base: 7.5 Temporal: 7.0 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.0.6003.21192 Yes 5005090 5005095 Windows Server 2008 for x64-based Systems Service Pack 2 5005090 (Monthly Rollup) 5005095 (Security Only) Important Spoofing 5004305 Base: 7.5 Temporal: 7.0 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.0.6003.21192 Yes 5005090 5005095 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5005090 (Monthly Rollup) 5005095 (Security Only) Important Spoofing 5004305 Base: 7.5 Temporal: 7.0 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.0.6003.21192 Yes 5005090 5005095 Windows Server 2008 R2 for x64-based Systems Service Pack 1 5005088 (Monthly Rollup) 5005089 (Security Only) Important Spoofing 5004289 Base: 7.5 Temporal: 7.0 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.1.7601.25685 Yes 5005088 5005089 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5005088 (Monthly Rollup) 5005089 (Security Only) Important Spoofing 5004289 Base: 7.5 Temporal: 7.0 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.1.7601.25685 Yes 5005088 5005089 Windows Server 2012 5005099 (Monthly Rollup) 5005094 (Security Only) Important Spoofing 5004294 Base: 7.5 Temporal: 7.0 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.2.9200.23435 Yes 5005099 5005094 Windows Server 2012 (Server Core installation) 5005099 (Monthly Rollup) 5005094 (Security Only) Important Spoofing 5004294 Base: 7.5 Temporal: 7.0 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.2.9200.23435 Yes 5005099 5005094 Windows Server 2012 R2 5005076 (Monthly Rollup) 5005106 (Security Only) Important Spoofing 5004298 Base: 7.5 Temporal: 7.0 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.3.9600.20094 Yes 5005076 5005106 Windows Server 2012 R2 (Server Core installation) 5005076 (Monthly Rollup) 5005106 (Security Only) Important Spoofing 5004298 Base: 7.5 Temporal: 7.0 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.3.9600.20094 Yes 5005076 5005106 Windows Server 2016	`5005043 (Security Update)`	Important	Spoofing	Yes
Windows Server 2016 (Server Core installation)	`5005043 (Security Update)`	Important	Spoofing	Yes
Windows Server 2019	`5005030 (Security Update)`	Important	Spoofing	Yes
Windows Server 2019 (Server Core installation)	`5005030 (Security Update)`	Important	Spoofing	Yes
Windows Server, version 2004 (Server Core installation)	`5005033 (Security Update)`	Important	Spoofing	Yes
Windows Server, version 20H2 (Server Core Installation)	`5005033 (Security Update)`	Important	Spoofing	Yes

Patches

3 patches

Article	Type	Restart
`5005043`	Security Update	Yes
`5005030`	Security Update	Yes
`5005033`	Security Update	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

None

References

MSRC Advisory MITRE NVD