OnlyPatch
Windows Client-Side Caching (CSC) Service

CVE-2025-60705 — Windows Client-Side Caching Elevation of Privilege Vulnerability

Important CVSS 7.8 EPSS 0.02405 🔬 Patch diffed 2025-11 archive

Executive Summary

Improper access control in Windows Client-Side Caching (CSC) Service allows an authorized attacker to elevate privileges locally.

Overview

7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
Category Elevation of Privilege
Weakness CWE-284: Improper Access Control
Released Nov 11 2025
Last Updated Nov 11 2025
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.02405 — 0.82603 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

0.02405
probability of exploitation in the next 30 days
0.82603 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

capstone (x86_64 disassembly) + pefile — ZwCreateKey/ZwOpenKey IAT cross-reference and Attributes pattern matching; PDB symbols not available in analysis environment · csc.sys (KB5068861)

CVE-2025-60705 patch (KB5068861, November 11 2025) fixes a privilege check bypass in csc.sys (Windows Client-Side Caching kernel driver). Root cause: CscRebootRenamepOpenKey called ZwCreateKey/ZwOpenKey with OBJECT_ATTRIBUTES.Attributes = 0x240 (OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE) — missing OBJ_FORCE_ACCESS_CHECK (0x400). A low-privileged user triggers the vulnerable path via IOfflineFilesCache::RenameItem (COM) → IRP_MJ_FILE_SYSTEM_CONTROL → CscRebootRenameAddEntry → CscRebootRenamepOpenKey. By placing a registry symbolic link at HKLM\SYSTEM\CurrentControlSet\Services\CSC\Parameters\RebootRename, the attacker causes csc.sys (running as SYSTEM) to create arbitrary registry keys in protected hives. Patch adds a feature flag-gated explicit caller privilege check: function grew 162→406 bytes; new helper at 0x140050420 validates caller identity before ZwCreateKey/ZwOpenKey; feature disabled (kill-switch) path preserves old behavior for controlled rollout. Fix approach differs from CVE-2025-62455 (mqac.sys): instead of adding OBJ_FORCE_ACCESS_CHECK to Attributes, an explicit pre-call access check is inserted. Reporter: T0 (@t0zhang). Similar CVE: CVE-2022-35820.

Pre-patch version 10.0.26100.5074 Download
Post-patch version 10.0.26100.7171 Download
Function Address Change Note
CscRebootRenamepOpenKey 0x140050870 → 0x140050974 code, length, address 162 → 406 bytes (+244 bytes). Primary patch site. Pre-patch: calls ZwCreateKey/ZwOpenKey directly with OBJECT_ATTRIBUTES.Attributes = 0x240 (OBJ_KERNEL_HANDLE | OBJ_CASE_INSENSITIVE), no caller privilege check. Post-patch: feature flag evaluator (call 0x1400220c4) added at function entry; when feature enabled, new explicit caller access-check helper (call 0x140050420, pool tag 'CsrR') validates the caller's security context before any registry operation; if check fails (NTSTATUS < 0), ZwCreateKey/ZwOpenKey are skipped and error returned. Feature disabled (kill-switch) path at 0x140050a95 falls through to original behavior with Attributes = 0x240. The Attributes value itself is NOT changed to 0x640 — fix is an explicit privilege check, not OBJ_FORCE_ACCESS_CHECK.
CscRebootRenamepOpenKey::PrivilegeCheckHelper new → 0x140050420 new function New helper added to post-patch binary. ~0xe9 bytes. Acquires current thread security context, allocates kernel buffer (ExAllocatePoolWithTag, pool tag 'CsrR', 0x100 bytes), performs Object Manager access check via ObReferenceObjectByPointer-class routine against the caller's token. Returns NTSTATUS — negative means caller lacks privileges, positive means check passed. Called only when feature flag is enabled.
FeatureFlagEvaluator new → 0x1400220c4 new function 41 bytes. Reads global feature state from .data section (RVA 0x3d850, VA 0x14003d850). If state & 0x10 (initialized bit): returns state & 1 (enabled=1, disabled=0). Otherwise calls internal feature computation helper. Return value 0 = feature disabled (old path), non-zero = feature enabled (new privilege-check path). Same Windows Feature Experimentation/Velocity kill-switch pattern as CVE-2025-62455 (mqac.sys).
View full diff report View RCA report Download PoC

Attack Path

Privilege check bypass - csc.sys opens a registry key with OBJ_KERNEL_HANDLE and no OBJ_FORCE_ACCESS_CHECK

Attack path for CVE-2025-60705 Privilege check bypass - csc.sys opens a registry key with OBJ_KERNEL_HANDLE and no OBJ_FORCE_ACCESS_CHECK 01 — ENTRY Low-privileged user drives the Offline Files reboot-rename path via COM CoCreateInstance(CLSID_OfflineFilesCache) then IOfflineFilesCache::RenameItem. Offline Files is on by default on Windows client SKUs; the CSC service just has to be running. 02 — CONTROLLED INPUT Attacker pre-places a registry key that the kernel path will open The rename entry determines which key CscRebootRenamepOpenKey targets, so the attacker chooses a key their own token could not legitimately open. 03 — PATH The rename request reaches the kernel key-open helper IRP_MJ_FILE_SYSTEM_CONTROL -> CscFsCtl -> CscDclInternalFsControl -> jump table -> CscDclMRxRebootRenameAdd -> CscRebootRenameAddEntry -> CscStoreRebootRenameIsValidRename -> CscRebootRenamepOpenKey. 04 — MISSING CHECK ZwCreateKey/ZwOpenKey called with Attributes = 0x240, missing OBJ_FORCE_ACCESS_CHECK (0x400) OBJ_KERNEL_HANDLE|OBJ_CASE_INSENSITIVE alone means the access check runs as KernelMode and is effectively skipped. The patch adds OBJ_FORCE_ACCESS_CHECK so the caller's token is evaluated. 05 — PRIMITIVE Registry access with kernel authority on behalf of an unprivileged caller Keys the user cannot open directly become reachable, giving a write primitive into privileged configuration and a route to elevation.

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

T0

On This Page