OnlyPatch
Windows NTLM

CVE-2025-21377 — NTLM Hash Disclosure Spoofing Vulnerability

Important CVSS 6.5 EPSS 0.24457 📢 Publicly disclosed 2025-02 archive

Executive Summary

None

Overview

6.5
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
Category Spoofing
Weakness CWE-73: External Control of File Name or Path
Released Feb 11 2025
Last Updated Feb 11 2025
Publicly Disclosed Yes
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.24457 — 0.97642 percentile
NVD CVSS 6.5 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Functional
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.0

EPSS Score

0.24457
probability of exploitation in the next 30 days
0.97642 percentile - updated 2026-07-25
View on FIRST.org

Affected Products

21 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for 32-bit Systems 5052040 (Security Update) Important Spoofing Yes
Windows 10 for x64-based Systems 5052040 (Security Update) Important Spoofing Yes
Windows 10 Version 1607 for 32-bit Systems 5052006 (Security Update) Important Spoofing Yes
Windows 10 Version 1607 for x64-based Systems 5052006 (Security Update) Important Spoofing Yes
Windows 10 Version 1809 for 32-bit Systems 5052000 (Security Update) Important Spoofing Yes
Windows 10 Version 1809 for x64-based Systems 5052000 (Security Update) Important Spoofing Yes
Windows 10 Version 21H2 for 32-bit Systems 5051974 (Security Update) Important Spoofing Yes
Windows 10 Version 21H2 for ARM64-based Systems 5051974 (Security Update) Important Spoofing Yes
Windows 10 Version 21H2 for x64-based Systems 5051974 (Security Update) Important Spoofing Yes
Windows 10 Version 22H2 for 32-bit Systems 5051974 (Security Update) Important Spoofing Yes
Windows 10 Version 22H2 for ARM64-based Systems 5051974 (Security Update) Important Spoofing Yes
Windows 10 Version 22H2 for x64-based Systems 5051974 (Security Update) Important Spoofing Yes
Windows 11 Version 22H2 for ARM64-based Systems 5051989 (Security Update) Important Spoofing Yes
Windows 11 Version 22H2 for x64-based Systems 5051989 (Security Update) Important Spoofing Yes
Windows 11 Version 23H2 for ARM64-based Systems 5051989 (Security Update) Important Spoofing Yes
Windows 11 Version 23H2 for x64-based Systems 5051989 (Security Update) Important Spoofing Yes
Windows 11 Version 24H2 for ARM64-based Systems 5051987 (Security Update) 5052105 (SecurityHotpatchUpdate) Important Spoofing 5050009 Base: 6.5 Temporal: 6.0 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 10.0.26100.3194 10.0.26100.3107 Yes None Windows 11 Version 24H2 for x64-based Systems 5051987 (Security Update) 5052105 (SecurityHotpatchUpdate) Important Spoofing 5050009 Base: 6.5 Temporal: 6.0 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 10.0.26100.3194 10.0.26100.3107 Yes None Windows Server 2008 for 32-bit Systems Service Pack 2 5052038 (Monthly Rollup) 5051972 (IE Cumulative) Important Spoofing 5050063 Base: 6.5 Temporal: 6.0 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.0.6003.23117 1 Yes None Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5052038 (Monthly Rollup) 5051972 (IE Cumulative) Important Spoofing 5050063 Base: 6.5 Temporal: 6.0 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.0.6003.23117 1 Yes None Windows Server 2008 for x64-based Systems Service Pack 2 5052038 (Monthly Rollup) 5051972 (IE Cumulative) Important Spoofing 5050063 Base: 6.5 Temporal: 6.0 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.0.6003.23117 1 Yes None Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5052038 (Monthly Rollup) 5051972 (IE Cumulative) Important Spoofing 5050063 Base: 6.5 Temporal: 6.0 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 6.0.6003.23117 1 Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 5051972 (IE Cumulative) 5052016 (Monthly Rollup) Important Spoofing 5050049 Base: 6.5 Temporal: 6.0 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 1 6.1.7601.27566 Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5051972 (IE Cumulative) 5052016 (Monthly Rollup) Important Spoofing 5050049 Base: 6.5 Temporal: 6.0 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 1 6.1.7601.27566 Yes None Windows Server 2012 5051972 (IE Cumulative) 5052020 (Monthly Rollup) Important Spoofing 5050004 Base: 6.5 Temporal: 6.0 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 1 6.2.9200.25317 Yes None Windows Server 2012 (Server Core installation) 5051972 (IE Cumulative) 5052020 (Monthly Rollup) Important Spoofing 5050004 Base: 6.5 Temporal: 6.0 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 1 6.2.9200.25317 Yes None Windows Server 2012 R2 5051972 (IE Cumulative) 5052042 (Monthly Rollup) Important Spoofing 5050048 Base: 6.5 Temporal: 6.0 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 1 6.3.9600.22417 Yes None Windows Server 2012 R2 (Server Core installation) 5051972 (IE Cumulative) 5052042 (Monthly Rollup) Important Spoofing 5050048 Base: 6.5 Temporal: 6.0 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 1 6.3.9600.22417 Yes None Windows Server 2016 5052006 (Security Update) Important Spoofing Yes
Windows Server 2016 (Server Core installation) 5052006 (Security Update) Important Spoofing Yes
Windows Server 2019 5052000 (Security Update) Important Spoofing Yes
Windows Server 2019 (Server Core installation) 5052000 (Security Update) Important Spoofing Yes
Windows Server 2022 5051979 (Security Update) 5052106 (SecurityHotpatchUpdate) Important Spoofing 5049983 Base: 6.5 Temporal: 6.0 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 10.0.20348.3207 10.0.20348.3148 Yes None Windows Server 2022 (Server Core installation) 5051979 (Security Update) 5052106 (SecurityHotpatchUpdate) Important Spoofing 5049983 Base: 6.5 Temporal: 6.0 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C 10.0.20348.3207 10.0.20348.3148 Yes None Windows Server 2022, 23H2 Edition (Server Core installation) 5051980 (Security Update) Important Spoofing Yes

Patches

6 patches
Article Type Restart
5052040 Security Update Yes
5052006 Security Update Yes
5052000 Security Update Yes
5051974 Security Update Yes
5051989 Security Update Yes
5051980 Security Update Yes

Known Exploits

Acknowledgments

Blaz Satler with 0patch by ACROS Security
Yorick Koster of Securify B.V.
Vincent Yau with Cathay Pacific
Ivan Sheung with Cathay Pacific
Owen Cheung with Cathay Pacific

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