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Windows Netlogon

CVE-2026-41089 — Windows Netlogon Remote Code Execution Vulnerability

Critical CVSS 9.8 EPSS 0.43788 2026-05 archive

Executive Summary

Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.

Overview

9.8
CVSS CRITICAL
Critical
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Remote Code Execution
Released May 12 2026
Last Updated May 12 2026
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.43788 — 0.98579 percentile
NVD CVSS 9.8 CRITICAL — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 8.5

EPSS Score

0.43788
probability of exploitation in the next 30 days
0.98579 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

9 affected products
Product KB Article Severity Impact Restart Required
Windows Server 2012 5087470 (Monthly Rollup) Critical Remote Code Execution Yes
Windows Server 2012 (Server Core installation) 5087470 (Monthly Rollup) Critical Remote Code Execution Yes
Windows Server 2012 R2 5087471 (Monthly Rollup) Critical Remote Code Execution Yes
Windows Server 2012 R2 (Server Core installation) 5087471 (Monthly Rollup) Critical Remote Code Execution Yes
Windows Server 2016 5087537 (Security Update) Critical Remote Code Execution Yes
Windows Server 2016 (Server Core installation) 5087537 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 5087538 (Security Update) Critical Remote Code Execution Yes
Windows Server 2019 (Server Core installation) 5087538 (Security Update) Critical Remote Code Execution Yes
Windows Server 2022 5087545 (Security Update) 5087424 (Security Hotpatch Update) Critical Remote Code Execution 5082142 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 10.0.20348.5139 10.0.20348.5074 Yes None Windows Server 2022 (Server Core installation) 5087545 (Security Update) 5087424 (Security Hotpatch Update) Critical Remote Code Execution 5082142 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 10.0.20348.5139 10.0.20348.5074 Yes None Windows Server 2022, 23H2 Edition (Server Core installation) 5087541 (Security Update) Critical Remote Code Execution Yes

Patches

5 patches
Article Type Restart
5087470 Monthly Rollup Yes
5087471 Monthly Rollup Yes
5087537 Security Update Yes
5087538 Security Update Yes
5087541 Security Update Yes

Known Exploits

Acknowledgments

Microsoft

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