Windows Security Zone Mapping
CVE-2025-27737 — Windows Security Zone Mapping Security Feature Bypass Vulnerability
Executive Summary
Improper input validation in Windows Security Zone Mapping allows an unauthorized attacker to bypass a security feature locally.
Overview
8.6
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Changed
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.5
EPSS Score
0.00618
probability of exploitation in the next 30 days
0.44844 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
27 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 5055547 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 for x64-based Systems | 5055547 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 5055521 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1607 for x64-based Systems | 5055521 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 5055519 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 1809 for x64-based Systems | 5055519 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 21H2 for 32-bit Systems | 5055518 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 21H2 for ARM64-based Systems | 5055518 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 21H2 for x64-based Systems | 5055518 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 22H2 for 32-bit Systems | 5055518 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 22H2 for ARM64-based Systems | 5055518 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 10 Version 22H2 for x64-based Systems | 5055518 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 11 Version 22H2 for ARM64-based Systems | 5055528 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 11 Version 22H2 for x64-based Systems | 5055528 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 11 Version 23H2 for ARM64-based Systems | 5055528 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 11 Version 23H2 for x64-based Systems | 5055528 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 11 Version 24H2 for ARM64-based Systems | 5055523 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows 11 Version 24H2 for x64-based Systems | 5055523 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 5055609 (Monthly Rollup) 5055596 (Security Only) 5055515 (IE Cumulative) Important Security Feature Bypass 5053888 Base: 8.6 Temporal: 7.5 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.23220 1.000 Yes None Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5055609 (Monthly Rollup) 5055596 (Security Only) 5055515 (IE Cumulative) Important Security Feature Bypass 5053888 Base: 8.6 Temporal: 7.5 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.23220 1.000 Yes None Windows Server 2008 for x64-based Systems Service Pack 2 5055609 (Monthly Rollup) 5055596 (Security Only) 5055515 (IE Cumulative) Important Security Feature Bypass 5053888 Base: 8.6 Temporal: 7.5 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.23220 1.000 Yes None Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5055609 (Monthly Rollup) 5055596 (Security Only) 5055515 (IE Cumulative) Important Security Feature Bypass 5053888 Base: 8.6 Temporal: 7.5 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 6.0.6003.23220 1.000 Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 5055515 (IE Cumulative) 5055561 (Monthly Rollup) 5055570 (Security Only) Important Security Feature Bypass 5053620 Base: 8.6 Temporal: 7.5 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 1.000 6.1.7601.27670 Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5055515 (IE Cumulative) 5055561 (Monthly Rollup) 5055570 (Security Only) Important Security Feature Bypass 5053620 Base: 8.6 Temporal: 7.5 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 1.000 6.1.7601.27670 Yes None Windows Server 2012 5055515 (IE Cumulative) 5055581 (Monthly Rollup) Important Security Feature Bypass 5053886 Base: 8.6 Temporal: 7.5 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 1.000 6.2.9200.25423 Yes None Windows Server 2012 (Server Core installation) 5055515 (IE Cumulative) 5055581 (Monthly Rollup) Important Security Feature Bypass 5053886 Base: 8.6 Temporal: 7.5 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 1.000 6.2.9200.25423 Yes None Windows Server 2012 R2 5055515 (IE Cumulative) 5055557 (Monthly Rollup) Important Security Feature Bypass 5053887 Base: 8.6 Temporal: 7.5 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 1.000 6.3.9600.22523 Yes None Windows Server 2012 R2 (Server Core installation) 5055515 (IE Cumulative) 5055557 (Monthly Rollup) Important Security Feature Bypass 5053887 Base: 8.6 Temporal: 7.5 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C 1.000 6.3.9600.22523 Yes None Windows Server 2016 | 5055521 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2016 (Server Core installation) | 5055521 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2019 | 5055519 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2019 (Server Core installation) | 5055519 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2022 | 5055526 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2022 (Server Core installation) | 5055526 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2022, 23H2 Edition (Server Core installation) | 5055527 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2025 | 5055523 (Security Update) |
Important | Security Feature Bypass | Yes |
| Windows Server 2025 (Server Core installation) | 5055523 (Security Update) |
Important | Security Feature Bypass | Yes |
Patches
8 patches
| Article | Type | Restart |
|---|---|---|
5055547 |
Security Update | Yes |
5055521 |
Security Update | Yes |
5055519 |
Security Update | Yes |
5055518 |
Security Update | Yes |
5055528 |
Security Update | Yes |
5055523 |
Security Update | Yes |
5055526 |
Security Update | Yes |
5055527 |
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
Ben Faull with Microsoft
References
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