OnlyFm252
Windows Local Security Authority Subsystem Service (LSASS)

CVE-2022-21884 — Local Security Authority Subsystem Service Elevation of Privilege Vulnerability

Important CVSS 7.8 EPSS 0.00669 2022-01 archive

Executive Summary

None

Overview

7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Elevation of Privilege
Released Jan 11 2022
Last Updated Jan 11 2022
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00669 — 0.47039 percentile
NVD CVSS 7.8 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.8

EPSS Score

0.00669
probability of exploitation in the next 30 days
0.47039 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

7 affected products
Product KB Article Severity Impact Restart Required
Windows Server 2008 for 32-bit Systems Service Pack 2 5009627 (Monthly Rollup) 5009601 (Security Only) Important Elevation of Privilege 5008274 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21349 Yes 5009627 5009601 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5009627 (Monthly Rollup) 5009601 (Security Only) Important Elevation of Privilege 5008274 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21349 Yes 5009627 5009601 Windows Server 2008 for x64-based Systems Service Pack 2 5009627 (Monthly Rollup) 5009601 (Security Only) Important Elevation of Privilege 5008274 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21349 Yes 5009627 5009601 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5009627 (Monthly Rollup) 5009601 (Security Only) Important Elevation of Privilege 5008274 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.21349 Yes 5009627 5009601 Windows Server 2008 R2 for x64-based Systems Service Pack 1 5009610 (Monthly Rollup) 5009621 (Security Only) Important Elevation of Privilege 5008244 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.25829 Yes 5009610 5009621 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5009610 (Monthly Rollup) 5009621 (Security Only) Important Elevation of Privilege 5008244 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.1.7601.25829 Yes 5009610 5009621 Windows Server 2012 5009586 (Monthly Rollup) 5009619 (Security Only) Important Elevation of Privilege 5008277 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.2.9200.23584 Yes 5009586 5009619 Windows Server 2012 (Server Core installation) 5009586 (Monthly Rollup) 5009619 (Security Only) Important Elevation of Privilege 5008277 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.2.9200.23584 Yes 5009586 5009619 Windows Server 2012 R2 5009624 (Monthly Rollup) 5009595 (Security Only) Important Elevation of Privilege 5008263 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20246 Yes 5009624 5009595 Windows Server 2012 R2 (Server Core installation) 5009624 (Monthly Rollup) 5009595 (Security Only) Important Elevation of Privilege 5008263 Base: 7.8 Temporal: 6.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 6.3.9600.20246 Yes 5009624 5009595 Windows Server 2016 5009546 (Security Update) Important Elevation of Privilege Yes
Windows Server 2016 (Server Core installation) 5009546 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 5009557 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 (Server Core installation) 5009557 (Security Update) Important Elevation of Privilege Yes
Windows Server 2022 5009555 (Security Update) Important Elevation of Privilege Yes
Windows Server 2022 (Server Core installation) 5009555 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 20H2 (Server Core Installation) 5009543 (Security Update) Important Elevation of Privilege Yes

Patches

4 patches
Article Type Restart
5009546 Security Update Yes
5009557 Security Update Yes
5009555 Security Update Yes
5009543 Security Update Yes

Known Exploits

Acknowledgments

Leo Adrien (@australeo)

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