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Windows MapUrlToZone

CVE-2025-21247 — MapUrlToZone Security Feature Bypass Vulnerability

Important CVSS 4.3 EPSS 0.02983 2025-03 archive

Executive Summary

Improper resolution of path equivalence in Windows MapUrlToZone allows an unauthorized attacker to bypass a security feature over a network.

Overview

4.3
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
Category Security Feature Bypass
Released Mar 11 2025
Last Updated Mar 11 2025
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.02983 — 0.85539 percentile
NVD CVSS 4.3 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
Low
INTEGRITY
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 3.9

EPSS Score

0.02983
probability of exploitation in the next 30 days
0.85539 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

23 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for 32-bit Systems 5053618 (Security Update) Important Security Feature Bypass Yes
Windows 10 for x64-based Systems 5053618 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1607 for 32-bit Systems 5053594 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1607 for x64-based Systems 5053594 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1809 for 32-bit Systems 5053596 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1809 for x64-based Systems 5053596 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 21H2 for 32-bit Systems 5053606 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 21H2 for ARM64-based Systems 5053606 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 21H2 for x64-based Systems 5053606 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 22H2 for 32-bit Systems 5053606 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 22H2 for ARM64-based Systems 5053606 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 22H2 for x64-based Systems 5053606 (Security Update) Important Security Feature Bypass Yes
Windows 11 Version 22H2 for ARM64-based Systems 5053602 (Security Update) Important Security Feature Bypass Yes
Windows 11 Version 22H2 for x64-based Systems 5053602 (Security Update) Important Security Feature Bypass Yes
Windows 11 Version 23H2 for ARM64-based Systems 5053602 (Security Update) Important Security Feature Bypass Yes
Windows 11 Version 23H2 for x64-based Systems 5053602 (Security Update) Important Security Feature Bypass Yes
Windows 11 Version 24H2 for ARM64-based Systems 5053598 (Security Update) 5053636 (SecurityHotpatchUpdate) Important Security Feature Bypass 5051987 5052105 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C 10.0.26100.3476 10.0.26100.3403 Yes None Windows 11 Version 24H2 for x64-based Systems 5053598 (Security Update) 5053636 (SecurityHotpatchUpdate) Important Security Feature Bypass 5051987 5052105 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C 10.0.26100.3476 10.0.26100.3403 Yes None Windows Server 2008 for 32-bit Systems Service Pack 2 5053888 (Monthly Rollup) 5053995 (Security Only) 5053593 (IE Cumulative) Important Security Feature Bypass 5052038 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C 6.0.6003.23168 1.000 Yes None Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5053888 (Monthly Rollup) 5053995 (Security Only) 5053593 (IE Cumulative) Important Security Feature Bypass 5052038 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C 6.0.6003.23168 1.000 Yes None Windows Server 2008 for x64-based Systems Service Pack 2 5053888 (Monthly Rollup) 5053995 (Security Only) Important Security Feature Bypass 5052038 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C 6.0.6003.23168 Yes None Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5053888 (Monthly Rollup) 5053995 (Security Only) Important Security Feature Bypass 5052038 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C 6.0.6003.23168 Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 5053593 (IE Cumulative) 5053620 (Monthly Rollup) 5053627 (Security Only) Important Security Feature Bypass 5052016 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C 1.000 6.1.7601.27618 Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5053593 (IE Cumulative) 5053620 (Monthly Rollup) 5053627 (Security Only) Important Security Feature Bypass 5052016 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C 1.000 6.1.7601.27618 Yes None Windows Server 2012 5053886 (Monthly Rollup) Important Security Feature Bypass Yes
Windows Server 2012 (Server Core installation) 5053886 (Monthly Rollup) Important Security Feature Bypass Yes
Windows Server 2012 R2 5053593 (IE Cumulative) 5053887 (Monthly Rollup) Important Security Feature Bypass 5052042 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C 1.000 6.3.9600.22470 Yes None Windows Server 2012 R2 (Server Core installation) 5053593 (IE Cumulative) 5053887 (Monthly Rollup) Important Security Feature Bypass 5052042 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C 1.000 6.3.9600.22470 Yes None Windows Server 2016 5053594 (Security Update) Important Security Feature Bypass Yes
Windows Server 2016 (Server Core installation) 5053594 (Security Update) Important Security Feature Bypass Yes
Windows Server 2019 5053596 (Security Update) Important Security Feature Bypass Yes
Windows Server 2019 (Server Core installation) 5053596 (Security Update) Important Security Feature Bypass Yes
Windows Server 2022 5053603 (Security Update) 5053638 (SecurityHotpatchUpdate) Important Security Feature Bypass 5051979 5052106 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C 10.0.20348.3328 10.0.20348.3270 Yes None Windows Server 2022 (Server Core installation) 5053603 (Security Update) 5053638 (SecurityHotpatchUpdate) Important Security Feature Bypass 5051979 5052106 Base: 4.3 Temporal: 3.9 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C 10.0.20348.3328 10.0.20348.3270 Yes None Windows Server 2022, 23H2 Edition (Server Core installation) 5053599 (Security Update) Important Security Feature Bypass Yes

Patches

7 patches
Article Type Restart
5053618 Security Update Yes
5053594 Security Update Yes
5053596 Security Update Yes
5053606 Security Update Yes
5053602 Security Update Yes
5053886 Monthly Rollup Yes
5053599 Security Update Yes

Known Exploits

Acknowledgments

George Hughey

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