Full Report
Microsoft has released the KB5065429 cumulative update for Windows 10 22H2 and Windows 10 21H2, with fourteen fixes or changes, including fixes for unexpected UAC prompts and severe lag and stuttering issues with NDI streaming software. [...]
Analysis Summary
# Vulnerability: Windows SMB Elevation of Privilege Vulnerability (CVE-2025-55234)
## CVE Details
- CVE ID: CVE-2025-55234
- CVSS Score: N/A (Security details are linked but score is not explicitly provided in the text)
- CWE: N/A
## Affected Systems
- Products: Windows SMB Server
- Versions: Not explicitly stated, but the fix is included in Windows 10 KB5065429 update for Windows 10 22H2 and Windows 10 21H2.
- Configurations: Relevant for environments preparing to deploy SMB hardening measures (SMB Server signing and SMB Server EPA).
## Vulnerability Description
This security update addresses a vulnerability in the Windows SMB service, classified as an Elevation of Privilege vulnerability. The update introduces new features to enable auditing for SMB client compatibility regarding SMB Server signing and SMB Server EPA, allowing administrators to assess incompatibility issues before deploying hardening measures.
## Exploitation
- Status: Unknown based on provided text, but the update is part of a Patch Tuesday release which included two publicly disclosed zero-days (not specified if this CVE is one of them).
- Complexity: N/A
- Attack Vector: N/A (Likely Network or Adjacent, given SMB context)
## Impact
- Confidentiality: Unknown
- Integrity: Unknown
- Availability: Unknown
## Remediation
### Patches
- **KB5065429 Cumulative Update:** This mandatory update fixes the vulnerability for Windows 10 22H2 (build 19045.6332) and Windows 10 21H2 (build 19044.6332).
### Workarounds
- No specific workarounds are mentioned, as the update is mandatory and contains critical fixes.
## Detection
- **Detection Methods:** Customers should use the auditing feature enabled by this update (SMB client compatibility auditing for SMB Server signing/EPA) to assess environment compatibility issues related to planned SMB hardening.
- **Indicators of Compromise:** None specified in the text related to the CVE itself.
## References
- Vendor Advisory/Support Bulletin: [https://support.microsoft.com/en-us/topic/september-9-2025-kb5065429-os-builds-19044-6332-and-19045-6332-b343e907-4f50-41d9-80f8-519490551b91](https://support.microsoft.com/en-us/topic/september-9-2025-kb5065429-os-builds-19044-6332-and-19045-6332-b343e907-4f50-41d9-80f8-519490551b91)
- CVE Reference: [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55234](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55234)