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Windows MapUrlToZone

CVE-2025-21329 — MapUrlToZone Security Feature Bypass Vulnerability

Important CVSS 4.3 EPSS 0.01463 2025-01 archive

Executive Summary

None

Overview

4.3
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
Category Security Feature Bypass
Released Jan 14 2025
Last Updated Jan 14 2025
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.01463 — 0.70206 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:U/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
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 3.8

EPSS Score

0.01463
probability of exploitation in the next 30 days
0.70206 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 5050013 (Security Update) Important Security Feature Bypass Yes
Windows 10 for x64-based Systems 5050013 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1607 for 32-bit Systems 5049993 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1607 for x64-based Systems 5049993 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1809 for 32-bit Systems 5050008 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 1809 for x64-based Systems 5050008 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 21H2 for 32-bit Systems 5049981 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 21H2 for ARM64-based Systems 5049981 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 21H2 for x64-based Systems 5049981 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 22H2 for 32-bit Systems 5049981 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 22H2 for ARM64-based Systems 5049981 (Security Update) Important Security Feature Bypass Yes
Windows 10 Version 22H2 for x64-based Systems 5049981 (Security Update) Important Security Feature Bypass Yes
Windows 11 Version 22H2 for ARM64-based Systems 5050021 (Security Update) Important Security Feature Bypass Yes
Windows 11 Version 22H2 for x64-based Systems 5050021 (Security Update) Important Security Feature Bypass Yes
Windows 11 Version 23H2 for ARM64-based Systems 5050021 (Security Update) Important Security Feature Bypass Yes
Windows 11 Version 23H2 for x64-based Systems 5050021 (Security Update) Important Security Feature Bypass Yes
Windows 11 Version 24H2 for ARM64-based Systems 5050009 (Security Update) Important Security Feature Bypass Yes
Windows 11 Version 24H2 for x64-based Systems 5050009 (Security Update) Important Security Feature Bypass Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 5050063 (Monthly Rollup) 5049994 (IE Cumulative) Important Security Feature Bypass 5048710 Base: 4.3 Temporal: 3.8 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C 6.0.6003.23070 1.007 Yes None Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5050063 (Monthly Rollup) 5049994 (IE Cumulative) Important Security Feature Bypass 5048710 Base: 4.3 Temporal: 3.8 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C 6.0.6003.23070 1.007 Yes None Windows Server 2008 for x64-based Systems Service Pack 2 5050063 (Monthly Rollup) 5049994 (IE Cumulative) Important Security Feature Bypass 5048710 Base: 4.3 Temporal: 3.8 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C 6.0.6003.23070 1.007 Yes None Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5050063 (Monthly Rollup) 5049994 (IE Cumulative) Important Security Feature Bypass 5048710 Base: 4.3 Temporal: 3.8 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C 6.0.6003.23070 1.007 Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 5050049 (Monthly Rollup) 5049994 (IE Cumulative) Important Security Feature Bypass 5048695 Base: 4.3 Temporal: 3.8 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C 6.1.7601.27520 1.003 Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5050049 (Monthly Rollup) 5049994 (IE Cumulative) Important Security Feature Bypass 5048695 Base: 4.3 Temporal: 3.8 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C 6.1.7601.27520 1.003 Yes None Windows Server 2012 5049994 (IE Cumulative) 5050004 (Monthly Rollup) Important Security Feature Bypass 5048699 Base: 4.3 Temporal: 3.8 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C 1.003 6.2.9200.25273 Yes None Windows Server 2012 (Server Core installation) 5049994 (IE Cumulative) 5050004 (Monthly Rollup) Important Security Feature Bypass 5048699 Base: 4.3 Temporal: 3.8 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C 1.003 6.2.9200.25273 Yes None Windows Server 2012 R2 5050048 (Monthly Rollup) 5049994 (IE Cumulative) Important Security Feature Bypass 5048735 Base: 4.3 Temporal: 3.8 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C 6.3.9600.22371 1.002 Yes None Windows Server 2012 R2 (Server Core installation) 5050048 (Monthly Rollup) 5049994 (IE Cumulative) Important Security Feature Bypass 5048735 Base: 4.3 Temporal: 3.8 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C 6.3.9600.22371 1.002 Yes None Windows Server 2016 5049993 (Security Update) Important Security Feature Bypass Yes
Windows Server 2016 (Server Core installation) 5049993 (Security Update) Important Security Feature Bypass Yes
Windows Server 2019 5050008 (Security Update) Important Security Feature Bypass Yes
Windows Server 2019 (Server Core installation) 5050008 (Security Update) Important Security Feature Bypass Yes
Windows Server 2022 5049983 (Security Update) Important Security Feature Bypass Yes
Windows Server 2022 (Server Core installation) 5049983 (Security Update) Important Security Feature Bypass Yes
Windows Server 2022, 23H2 Edition (Server Core installation) 5049984 (Security Update) Important Security Feature Bypass Yes
Windows Server 2025 5050009 (Security Update) Important Security Feature Bypass Yes
Windows Server 2025 (Server Core installation) 5050009 (Security Update) Important Security Feature Bypass Yes

Patches

8 patches
Article Type Restart
5050013 Security Update Yes
5049993 Security Update Yes
5050008 Security Update Yes
5049981 Security Update Yes
5050021 Security Update Yes
5050009 Security Update Yes
5049983 Security Update Yes
5049984 Security Update Yes

Known Exploits

Acknowledgments

George Hughey

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