Windows Common Log File System Driver
CVE-2022-37969 — Windows Common Log File System Driver Elevation of Privilege Vulnerability
Important
CVSS 7.8
EPSS 0.28275
⚠️ Exploited in the wild
📢 Publicly disclosed
🔬 Patch diffed
2022-09 archive
Executive Summary
None
Overview
7.8
CVSS HIGH
Important
MS Severity
Exploited
MS Exploit Status
Exploitation Detected
MS Exploit Likelihood
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
0.28275
probability of exploitation in the next 30 days
0.97916 percentile - updated 2026-07-25
View on FIRST.org
Affected Products
22 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 5017327 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 for x64-based Systems | 5017327 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 5017305 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for x64-based Systems | 5017305 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 5017315 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 5017315 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for x64-based Systems | 5017315 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 20H2 for 32-bit Systems | 5017308 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 20H2 for ARM64-based Systems | 5017308 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H1 for 32-bit Systems | 5017308 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H1 for ARM64-based Systems | 5017308 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H1 for x64-based Systems | 5017308 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for 32-bit Systems | 5017308 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for ARM64-based Systems | 5017308 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for x64-based Systems | 5017308 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 version 21H2 for ARM64-based Systems | 5017328 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 version 21H2 for x64-based Systems | 5017328 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 5017361 (Monthly Rollup) 5017373 (Security Only) Important Elevation of Privilege 5016676 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 6.1.7601.26115 Yes 5017361 5017373 Windows 7 for x64-based Systems Service Pack 1 5017361 (Monthly Rollup) 5017373 (Security Only) Important Elevation of Privilege 5016676 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 6.1.7601.26115 Yes 5017361 5017373 Windows 8.1 for 32-bit systems 5017367 (Monthly Rollup) 5017365 (Security Only) Important Elevation of Privilege 5016681 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 6.3.9600.20571 Yes 5017367 5017365 Windows 8.1 for x64-based systems 5017367 (Monthly Rollup) 5017365 (Security Only) Important Elevation of Privilege 5016681 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 6.3.9600.20571 Yes 5017367 5017365 Windows RT 8.1 | 5017367 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 5017358 (Monthly Rollup) 5017371 (Security Only) Important Elevation of Privilege 5016669 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 6.0.6003.21666 Yes 5017358 5017371 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5017358 (Monthly Rollup) 5017371 (Security Only) Important Elevation of Privilege 5016669 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 6.0.6003.21666 Yes 5017358 5017371 Windows Server 2008 for x64-based Systems Service Pack 2 5017358 (Monthly Rollup) 5017371 (Security Only) Important Elevation of Privilege 5016669 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 6.0.6003.21666 Yes 5017358 5017371 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5017358 (Monthly Rollup) 5017371 (Security Only) Important Elevation of Privilege 5016669 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 6.0.6003.21666 Yes 5017358 5017371 Windows Server 2008 R2 for x64-based Systems Service Pack 1 5017361 (Monthly Rollup) 5017373 (Security Only) Important Elevation of Privilege 5016676 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 6.1.7601.26115 Yes 5017361 5017373 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5017361 (Monthly Rollup) 5017373 (Security Only) Important Elevation of Privilege 5016676 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 6.1.7601.26115 Yes 5017361 5017373 Windows Server 2012 5017370 (Monthly Rollup) 5017377 (Security Only) Important Elevation of Privilege 5016672 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 6.2.9200.23865 Yes 5017370 5017377 Windows Server 2012 (Server Core installation) 5017370 (Monthly Rollup) 5017377 (Security Only) Important Elevation of Privilege 5016672 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 6.2.9200.23865 Yes 5017370 5017377 Windows Server 2012 R2 5017367 (Monthly Rollup) 5017365 (Security Only) Important Elevation of Privilege 5016681 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 6.3.9600.20571 Yes 5017367 5017365 Windows Server 2012 R2 (Server Core installation) 5017367 (Monthly Rollup) 5017365 (Security Only) Important Elevation of Privilege 5016681 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 6.3.9600.20571 Yes 5017367 5017365 Windows Server 2016 | 5017305 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2016 (Server Core installation) | 5017305 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 | 5017315 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 (Server Core installation) | 5017315 (Security Update) |
Important | Elevation of Privilege | Yes |
Patches
6 patches
| Article | Type | Restart |
|---|---|---|
5017327 |
Security Update | Yes |
5017305 |
Security Update | Yes |
5017315 |
Security Update | Yes |
5017308 |
Security Update | Yes |
5017328 |
Security Update | Yes |
5017367 |
Monthly Rollup | Yes |
Patch Diff
ghidriff · clfs.sys (KB5017328)
Patch diff 10.0.22000.832 -> 10.0.22000.978 (ITW clfs EoP; container-load symbol validation)
| Function | Address | Change | Note |
|---|---|---|---|
__GSHandlerCheck |
1c000c9c8 -> 1c000d388 |
refcount, address | similarity 1.0 |
_guard_dispatch_icall |
1c000cc90 -> 1c000d650 |
refcount, address, calling | similarity 0.89 |
CClfsBaseFile::OffsetToAddr |
1c002cf40 -> 1c002eca0 |
refcount, address, calling | similarity 1.0 |
CClfsRequest::DeleteContainer |
1c0050b70 -> 1c0052c34 |
code, length, address, called | similarity 0.4 |
CClfsBaseFile::GetSymbol |
1c002cdd8 -> 1c002eb28 |
code, refcount, length, address, calling | similarity 0.94 |
CClfsLogFcbPhysical::AcquireForReadAheadCallback |
1c0002950 |
refcount | similarity 1.0 |
NTOSKRNL.EXE::RtlQueryFeatureConfiguration |
EXTERNAL:00000007 |
refcount, calling | similarity 1.0 |
NTOSKRNL.EXE::RtlInitializeGenericTableAvl |
EXTERNAL:00000075 -> EXTERNAL:00000023 |
refcount, address, calling | similarity 1.0 |
`CClfsBaseFilePersisted::LoadContainerQ'::__l1::fin$0 |
1c0046d40 -> 1c0048da0 |
length, address | similarity 0.88 |
RtlStringCbLengthW |
1c001035c -> 1c00100a0 |
code, refcount, length, address, calling, called | similarity 0.48 |
CClfsRequest::AllocContainer |
1c0050740 -> 1c00527b0 |
code, length, address, called | similarity 0.32 |
NTOSKRNL.EXE::RtlDeleteElementGenericTableAvl |
EXTERNAL:00000096 -> EXTERNAL:00000026 |
refcount, address, calling | similarity 1.0 |
CClfsBaseFilePersisted::LoadContainerQ |
1c0035ac0 -> 1c0037820 |
code, length, address, calling, called | similarity 0.17 |
__security_check_cookie |
1c000c7e0 |
refcount, calling | similarity 1.0 |
NTOSKRNL.EXE::RtlLookupElementGenericTableAvl |
EXTERNAL:0000007f -> EXTERNAL:00000022 |
refcount, address, calling | similarity 1.0 |
CClfsBaseFile::ContainerCount |
1c002cecc -> 1c002ec2c |
refcount, address, calling | similarity 1.0 |
NTOSKRNL.EXE::ExFreePoolWithTag |
EXTERNAL:00000002 |
refcount, calling | similarity 1.0 |
NTOSKRNL.EXE::RtlInsertElementGenericTableAvl |
EXTERNAL:0000007b -> EXTERNAL:00000021 |
refcount, address, calling | similarity 1.0 |
CClfsBaseFilePersisted::CreateImage |
1c003a1f0 -> 1c003c270 |
code, length, address | similarity 0.93 |
CClfsBaseFile::GetSymbol |
1c002c2d0 -> 1c002e010 |
code, refcount, length, address, calling | similarity 0.96 |
NTOSKRNL.EXE::RtlNumberGenericTableElementsAvl |
EXTERNAL:0000009f -> EXTERNAL:00000024 |
refcount, address, calling | similarity 1.0 |
CClfsBaseFile::ClientCount |
1c0041338 -> 1c0043398 |
refcount, address, calling | similarity 1.0 |
NTOSKRNL.EXE::ExAllocatePoolWithTag |
EXTERNAL:00000001 |
refcount, calling | similarity 1.0 |
CClfsBaseFile::freeOffsetNode |
1c0059010 -> 1c0028200 |
name, fullname, refcount, sig, address, parent | similarity 0.8 |
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
Zscaler ThreatLabz
CrowdStrike
Genwei Jiang with Mandiant, FLARE OTF
Quan Jin
References
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