CVE-2024-26170 — Windows Composite Image File System (CimFS) Elevation of Privilege Vulnerability

Executive Summary

None

Overview

7.8

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

More Likely

MS Exploit Likelihood

Category Elevation of Privilege

Weakness CWE-20: Improper Input Validation

Released Mar 12 2024

Last Updated Mar 12 2024

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.06647 — 0.93269 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

0.06647

probability of exploitation in the next 30 days

0.93269 percentile - updated 2026-08-14

View on FIRST.org

Affected Products

13 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 21H2 for 32-bit Systems	`5035845 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 21H2 for ARM64-based Systems	`5035845 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 21H2 for x64-based Systems	`5035845 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 22H2 for 32-bit Systems	`5035845 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 22H2 for ARM64-based Systems	`5035845 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 22H2 for x64-based Systems	`5035845 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 11 version 21H2 for ARM64-based Systems	`5035854 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 11 version 21H2 for x64-based Systems	`5035854 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 11 Version 22H2 for ARM64-based Systems	`5035853 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 11 Version 22H2 for x64-based Systems	`5035853 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 11 Version 23H2 for ARM64-based Systems	`5035853 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 11 Version 23H2 for x64-based Systems	`5035853 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server 2022 5035857 (Security Update) 5035959 (SecurityHotpatchUpdate) Important Elevation of Privilege 5034770 5034860 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 10.0.20348.2340 10.0.20348.2333 Yes None Windows Server 2022 (Server Core installation) 5035857 (Security Update) 5035959 (SecurityHotpatchUpdate) Important Elevation of Privilege 5034770 5034860 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 10.0.20348.2340 10.0.20348.2333 Yes None Windows Server 2022, 23H2 Edition (Server Core installation)	`5035856 (Security Update)`	Important	Elevation of Privilege	Yes

Patches

4 patches

Article	Type	Restart
`5035845`	Security Update	Yes
`5035854`	Security Update	Yes
`5035853`	Security Update	Yes
`5035856`	Security Update	Yes

Exploits & PoC

1 public PoC

Unverified third-party code

Public proof-of-concept repositories aggregated from PoC-in-GitHub. They are not reviewed and may be incomplete, non-functional, or malicious — inspect the code before running anything.

Repository	Stars	Published	Description
ProbNotAnExploiter/CVE-2024-26170-extended	0	2026-06-13	researching for CVE-2024-26170 or cimfs.sys to find overflows or bugs that is considered a zero-day

Detection Rules

No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.

Acknowledgments

Anonymous

References

MSRC Advisory MITRE NVD