Windows SMB
CVE-2025-55234 — Windows SMB Elevation of Privilege Vulnerability
Executive Summary
SMB Server might be susceptible to relay attacks depending on the configuration. An attacker who successfully exploited these vulnerabilities could perform relay attacks and make the users subject to elevation of privilege attacks. The SMB Server already supports mechanisms for hardening against relay attacks: SMB Server signing SMB Server Extended Protection for Authentication (EPA) Microsoft is releasing this CVE to provide customers with audit capabilities to help them to assess their environment and to identify any potential device or software incompatibility issues before deploying SMB Server hardening measures that protect against relay attacks. If you have not already enabled SMB Server hardening measures, we advise customers to take the following actions to be protected from these relay attacks: Assess your environment by utilizing the audit capabilities that we are exposing in the September 2025 security updates. See Support for Audit Events to deploy SMB Server Hardening—SMB Server Signing & SMB Server EPA. Adopt appropriate SMB Server hardening measures.
Overview
8.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
Temporal Score: 7.7
EPSS Score
0.18834
probability of exploitation in the next 30 days
0.9692 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
37 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 5065430 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 for x64-based Systems | 5065430 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 5065427 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for x64-based Systems | 5065427 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 5065428 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for x64-based Systems | 5065428 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for 32-bit Systems | 5065429 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for ARM64-based Systems | 5065429 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for x64-based Systems | 5065429 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 22H2 for 32-bit Systems | 5065429 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 22H2 for ARM64-based Systems | 5065429 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 22H2 for x64-based Systems | 5065429 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 Version 22H2 for ARM64-based Systems | 5065431 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 Version 22H2 for x64-based Systems | 5065431 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 Version 23H2 for ARM64-based Systems | 5065431 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 Version 23H2 for x64-based Systems | 5065431 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 Version 24H2 for ARM64-based Systems | 5065426 (Security Update) 5065474 (SecurityHotpatchUpdate) |
Important | Elevation of Privilege | Yes |
| Windows 11 Version 24H2 for x64-based Systems | 5065426 (Security Update) 5065474 (SecurityHotpatchUpdate) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 | 5065508 (Monthly Rollup) 5065511 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | 5065508 (Monthly Rollup) 5065511 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 | 5065508 (Monthly Rollup) 5065511 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | 5065508 (Monthly Rollup) 5065511 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 | 5065468 (Monthly Rollup) 5065510 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | 5065468 (Monthly Rollup) 5065510 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 | 5065509 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 (Server Core installation) | 5065509 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 R2 | 5065507 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 R2 (Server Core installation) | 5065507 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2016 | 5065427 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2016 (Server Core installation) | 5065427 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 | 5065428 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 (Server Core installation) | 5065428 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2022 | 5065432 (Security Update) 5065306 (SecurityHotpatchUpdate) |
Important | Elevation of Privilege | Yes |
| Windows Server 2022 (Server Core installation) | 5065432 (Security Update) 5065306 (SecurityHotpatchUpdate) |
Important | Elevation of Privilege | Yes |
| Windows Server 2022, 23H2 Edition (Server Core installation) | 5065425 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2025 | 5065426 (Security Update) 5065474 (SecurityHotpatchUpdate) |
Important | Elevation of Privilege | Yes |
| Windows Server 2025 (Server Core installation) | 5065426 (Security Update) 5065474 (SecurityHotpatchUpdate) |
Important | Elevation of Privilege | Yes |
Patches
12 patches
| Article | Type | Restart |
|---|---|---|
5065430 |
Security Update | Yes |
5065427 |
Security Update | Yes |
5065428 |
Security Update | Yes |
5065429 |
Security Update | Yes |
5065431 |
Security Update | Yes |
5065426 (Security Update) 5065474 |
Security Update | Yes |
5065508 (Monthly Rollup) 5065511 |
Monthly Rollup | Yes |
5065468 (Monthly Rollup) 5065510 |
Monthly Rollup | Yes |
5065509 |
Monthly Rollup | Yes |
5065507 |
Monthly Rollup | Yes |
5065432 (Security Update) 5065306 |
Security Update | Yes |
5065425 |
Security Update | Yes |
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
Anonymous, Anonymous
References
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