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Windows Common Log File System Driver

CVE-2025-60709 — Windows Common Log File System Driver Elevation of Privilege Vulnerability

Important CVSS 7.8 EPSS 0.00502 🔬 Patch diffed 2025-11 archive

Executive Summary

Out-of-bounds read in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

Overview

7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Elevation of Privilege
Weakness CWE-125: Out-of-bounds Read
Released Nov 11 2025
Last Updated Nov 11 2025
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00502 — 0.40562 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

0.00502
probability of exploitation in the next 30 days
0.40562 percentile - updated 2026-08-14
View on FIRST.org

Affected Products

21 affected products
Product KB Article Severity Impact Restart Required
Windows 10 Version 1607 for 32-bit Systems 5068864 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1607 for x64-based Systems 5068864 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for 32-bit Systems 5068791 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for x64-based Systems 5068791 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 21H2 for 32-bit Systems 5068781 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 21H2 for ARM64-based Systems 5068781 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 21H2 for x64-based Systems 5068781 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 22H2 for 32-bit Systems 5068781 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 22H2 for ARM64-based Systems 5068781 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 22H2 for x64-based Systems 5068781 (Security Update) Important Elevation of Privilege Yes
Windows 11 Version 23H2 for ARM64-based Systems 5068865 (Security Update) Important Elevation of Privilege Yes
Windows 11 Version 23H2 for x64-based Systems 5068865 (Security Update) Important Elevation of Privilege Yes
Windows 11 Version 24H2 for ARM64-based Systems 5068861 (Security Update) 5068966 (Security Hotpatch Update) Important Elevation of Privilege 5066835 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 10.0.26100.7171 10.0.26100.7092 Yes None Windows 11 Version 24H2 for x64-based Systems 5068861 (Security Update) 5068966 (Security Hotpatch Update) Important Elevation of Privilege 5066835 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 10.0.26100.7171 10.0.26100.7092 Yes None Windows 11 Version 25H2 for ARM64-based Systems 5068861 (Security Update) 5068966 (Security Hotpatch Update) Important Elevation of Privilege 5066835 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 10.0.26200.7171 10.0.26200.7092 Yes None Windows 11 Version 25H2 for x64-based Systems 5068861 (Security Update) 5068966 (Security Hotpatch Update) Important Elevation of Privilege 5066835 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 10.0.26200.7171 10.0.26200.7092 Yes None Windows Server 2008 for 32-bit Systems Service Pack 2 5068906 (Monthly Rollup) 5068909 (Security Only) Important Elevation of Privilege 5066874 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 6.0.6003.23624 Yes None Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5068906 (Monthly Rollup) 5068909 (Security Only) Important Elevation of Privilege 5066874 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 6.0.6003.23624 Yes None Windows Server 2008 for x64-based Systems Service Pack 2 5068906 (Monthly Rollup) 5068909 (Security Only) Important Elevation of Privilege 5066874 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 6.0.6003.23624 Yes None Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5068906 (Monthly Rollup) 5068909 (Security Only) Important Elevation of Privilege 5066874 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 6.0.6003.23624 Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 5068904 (Monthly Rollup) 5068908 (Security Only) Important Elevation of Privilege 5066872 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 6.1.7601.28021 Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5068904 (Monthly Rollup) 5068908 (Security Only) Important Elevation of Privilege 5066872 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 6.1.7601.28021 Yes None Windows Server 2012 5068907 (Monthly Rollup) Important Elevation of Privilege Yes
Windows Server 2012 (Server Core installation) 5068907 (Monthly Rollup) Important Elevation of Privilege Yes
Windows Server 2012 R2 5068905 (Monthly Rollup) Important Elevation of Privilege Yes
Windows Server 2012 R2 (Server Core installation) 5068905 (Monthly Rollup) Important Elevation of Privilege Yes
Windows Server 2016 5068864 (Security Update) Important Elevation of Privilege Yes
Windows Server 2016 (Server Core installation) 5068864 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 5068791 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 (Server Core installation) 5068791 (Security Update) Important Elevation of Privilege Yes
Windows Server 2022 5068787 (Security Update) 5068840 (Security Hotpatch Update) Important Elevation of Privilege 5066782 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 10.0.20348.4405 10.0.20348.4346 Yes None Windows Server 2022 (Server Core installation) 5068787 (Security Update) 5068840 (Security Hotpatch Update) Important Elevation of Privilege 5066782 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 10.0.20348.4405 10.0.20348.4346 Yes None Windows Server 2022, 23H2 Edition (Server Core installation) 5068779 (Security Update) Important Elevation of Privilege Yes

Patches

7 patches
Article Type Restart
5068864 Security Update Yes
5068791 Security Update Yes
5068781 Security Update Yes
5068865 Security Update Yes
5068907 Monthly Rollup Yes
5068905 Monthly Rollup Yes
5068779 Security Update Yes

Patch Diff

ghidriff · clfs.sys (KB5068861)

Off-by-0x28 out-of-bounds read in clfs.sys ClfsGetFirstRecord. The record offset is read from +0x28 of the caller-supplied buffer and bounds-checked as `offset <= bufferLen + 0x28`, which permits the offset to point up to 0x28 bytes past the end of the allocation; the resulting pointer is then returned and consumed as a _CLFS_RECORD_HEADER. The patch requires `offset + 0x28 <= bufferLen` so the whole header fits inside the buffer, and adds a minimum `offset > 0x6f`. Gated behind Feature_1005355321 - the original comparison still ships and runs when the flag is disabled.

Pre-patch version 10.0.26100.7019
Post-patch version 10.0.26100.7171
Function Address Change Note
ClfsGetFirstRecord code (bounds check corrected, gated on Feature_1005355321) Pre-patch returned param_1 + offset when `offset <= param_2 + 0x28`, permitting the record offset to land up to 0x28 bytes PAST the end of the buffer. Patched (flag-enabled) path requires `offset + 0x28 <= param_2` so the whole 0x28-byte _CLFS_RECORD_HEADER fits inside the buffer, and adds a new minimum `offset > 0x6f`. The flag-disabled branch keeps the original comparison.
Feature_1005355321__private_IsEnabledDeviceUsageNoInline / _IsEnabledFallback added -- CFR gate Selects between the corrected and original bounds test. Both ship in 10.0.26100.7171.
View full diff report View RCA report

Attack Path

Off-by-0x28 out-of-bounds read - the record offset was allowed to point past the end of the buffer

Attack path for CVE-2025-60709 Off-by-0x28 out-of-bounds read - the record offset was allowed to point past the end of the buffer 01 — ENTRY Standard user creates a CLFS log and reads records from it CreateLogFile plus a record read. CLFS is a core kernel component present on every install; logs live in user-writable directories, so the buffer contents are attacker-supplied. 02 — CONTROLLED INPUT The record offset at +0x28 of the buffer is attacker-chosen ClfsGetFirstRecord reads `uVar1 = *(uint *)(param_1 + 0x28)` straight out of the caller's buffer. param_2 is the buffer length. 03 — PATH The offset is bounds-checked and then used to form a record-header pointer Pre-patch: `if (0x27 < uVar1 + 0x28) { p = param_1 + uVar1; if (param_2 + 0x28 < uVar1) p = NULL; return p; }` 04 — MISSING CHECK The comparison allows the offset to exceed the buffer by up to 0x28 bytes The test is `uVar1 <= param_2 + 0x28`, i.e. the offset may run 0x28 bytes past the end. The correct relation is `uVar1 + 0x28 <= param_2` - the whole 0x28-byte header must fit INSIDE the buffer. The patch uses that form and adds a minimum `uVar1 > 0x6f`, keeping the offset clear of the header region. 05 — PRIMITIVE A _CLFS_RECORD_HEADER is read from up to 0x28 bytes beyond the allocation The returned pointer is consumed as a record header, so adjacent pool contents are parsed as CLFS metadata. Fix is gated behind Feature_1005355321; the original comparison still ships and runs when the flag is off.

Derived from the patch delta: the checks added by the vendor identify which fields crossed a trust boundary unvalidated. Reachability and privilege are taken from the call chain in the RCA report.

Known Exploits

Acknowledgments

Anonymous

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