CVE-2026-41089Windows Server 2012 Stack Buffer Overflow
Windows Netlogon Remote Code Execution Vulnerability
Published May 12, 2026 · Updated Aug 10, 2026 · Also known as EUVD-2026-29681, GHSA-7j2c-v44v-wc8f
Key Facts
Patch immediately- CVE-2026-41089 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Windows Server 2012 (Microsoft), windows server 2012 R2 (Microsoft), Windows Server 2016 (Microsoft) and 11 more products.
- It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since May 29, 2026. No public exploit code is known.
- EPSS estimates a 80% probability of exploitation in the next 30 days.
- Fixed versions are available, including Windows Server 2016 10.0.14393.9140, Windows Server 2019 10.0.17763.8755, Windows Server 2022 10.0.20348.5074.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
80%
Exploit maturity
Exploited (KEV)
ATLAS score
61/100
Publication score, see How it works
Exploitation Verdict
KEV listed
May 29, 2026
17 days after publication
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
3
Reports of active use
Advisories And Exploit References
Description
Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CIRCL KEV | May 29, 2026 | n/a | Not reported |
| Industry KEV feed | May 29, 2026 | n/a | Not reported |
Affected Products
38 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows Server 2012Microsoft | 6.2.9200.26079, r2, >= 6.2.9200.0 | 6.2.9200.26079 |
| windows server 2012 R2Microsoft | 6.3.9600.23181, >= 6.3.9600.0 | 6.3.9600.23181 |
| Windows Server 2016Microsoft | 10.0.14393.9140, >= 10.0.14393.0 | 10.0.14393.9140 |
| Windows Server 2019Microsoft | 10.0.17763.8755, >= 10.0.17763.0 | 10.0.17763.8755 |
| Windows Server 2022Microsoft | 10.0.20348.5139, >= 10.0.20348.0 | 10.0.20348.5074 |
Patched Releases
Windows Server 2016
10.0.14393.9140
Windows Server 2019
10.0.17763.8755
Windows Server 2022
10.0.20348.5074, 10.0.20348.5139
Windows Server 2022 23h2
10.0.25398.2330
Windows Server 2025
10.0.26100.32772, 10.0.26100.32860
Windows Server 2012
6.2.9200.26079
Windows Server 2012 (Server Core installation)
6.2.9200.26079
windows server 2012 R2
6.3.9600.23181
Windows Server 2012 R2 (Server Core installation)
6.3.9600.23181
Windows Server 2016 (Server Core installation)
10.0.14393.9140
Windows Server 2019 (Server Core installation)
10.0.17763.8755
Windows Server 2022, 23H2 Edition (Server Core installation)
10.0.25398.2330
Windows Server 2025 (Server Core installation)
10.0.26100.32860
Timeline
Publicly disclosed
May 12, 2026
Added to CIRCL KEV
May 29, 2026
Added to Industry KEV feed
May 29, 2026
Last updated
Aug 10, 2026
Weakness Type
- CWE-121 Stack-based Buffer Overflow
References
FAQ
Common Questions.
Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.
Affected: Windows Server 2012 (Microsoft) versions 6.2.9200.26079, r2, >= 6.2.9200.0; windows server 2012 R2 (Microsoft) versions 6.3.9600.23181, >= 6.3.9600.0; Windows Server 2016 (Microsoft) versions 10.0.14393.9140, >= 10.0.14393.0, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since May 29, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Windows Server 2016 10.0.14393.9140, Windows Server 2019 10.0.17763.8755, Windows Server 2022 10.0.20348.5074.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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