CVE-2026-41089
High PUBLISHEDWindows Netlogon Remote Code Execution Vulnerability
Not yet in CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.
- CVE Published
- May 12, 2026
- Exploitation Reported
- Jun 02, 2026
- CVSS
- 9.8 Critical
- EPSS
- 72.3%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Microsoft |
Windows Server 2012
|
6.2.9200.0 to < 6.2.9200.26079 |
Affected |
| Microsoft |
Windows Server 2012 (Server Core installation)
|
6.2.9200.0 to < 6.2.9200.26079 |
Affected |
| Microsoft |
Windows Server 2012 R2
|
6.3.9600.0 to < 6.3.9600.23181 |
Affected |
| Microsoft |
Windows Server 2012 R2 (Server Core installation)
|
6.3.9600.0 to < 6.3.9600.23181 |
Affected |
| Microsoft |
Windows Server 2016
|
10.0.14393.0 to < 10.0.14393.9140 |
Affected |
| Microsoft |
Windows Server 2016 (Server Core installation)
|
10.0.14393.0 to < 10.0.14393.9140 |
Affected |
| Microsoft |
Windows Server 2019
|
10.0.17763.0 to < 10.0.17763.8755 |
Affected |
| Microsoft |
Windows Server 2019 (Server Core installation)
|
10.0.17763.0 to < 10.0.17763.8755 |
Affected |
| Microsoft |
Windows Server 2022
|
10.0.20348.0 to < 10.0.20348.5139 |
Affected |
| Microsoft |
Windows Server 2022, 23H2 Edition (Server Core installation)
|
10.0.25398.0 to < 10.0.25398.2330 |
Affected |
| Microsoft |
Windows Server 2025
|
10.0.26100.0 to < 10.0.26100.32860 |
Affected |
| Microsoft |
Windows Server 2025 (Server Core installation)
|
10.0.26100.0 to < 10.0.26100.32860 |
Affected |
CVE References
- Windows Netlogon Remote Code Execution Vulnerability msrc.microsoft.com · Vendor Advisory https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41089
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CERT-EU First | 2026-05-13 15:21 UTC |
| KEVIntel | 2026-06-02 11:06 UTC |
| The Shadowserver | 2026-06-02 17:21 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
Exploited in the wild
Recorded 2026-06-02 11:06:00 UTC · KEVIntel
Proof of concept available
Recorded 2026-06-09 15:31:13 UTC · GitHub
Weaknesses (CWE)
-
Stack-based Buffer Overflow
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2026-06-09 15:31:13 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-09 14:14:43 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-09 11:16:32 UTC · 0 stars
github · Created 2026-06-06 15:47:31 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-06 15:39:39 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-06 15:37:04 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-06 14:17:37 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-06 14:02:43 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-06 13:42:34 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-06 13:29:33 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-06 13:21:55 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-06 12:11:11 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-06 11:59:09 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-05 11:05:43 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-05 11:02:12 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-05 08:23:12 UTC · 0 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
github · Created 2026-06-03 16:30:35 UTC · 8 stars
CVE-2026-41089 checker: unauthenticated, non-destructive detection for the Netlogon CLDAP stack buffer overflow (CVSS 9.8). Reports whether a domain controller's domain is long enough to crash, without sending the overflow. The binary-verified analysis the public PoCs got wrong.
github · Created 2026-06-03 02:29:06 UTC · 11 stars
CVE-2026-41089 是 Windows Netlogon 服务中一个关键的远程代码执行漏洞
github · Created 2026-06-03 00:59:29 UTC · 0 stars
这是一个用于防御巡检的 CVE-2026-41089 检测脚本。该漏洞是 Microsoft 在 2026 年 5 月安全更新中披露的 Windows Netlogon 远程代码执行漏洞。
github · Created 2026-06-01 04:22:29 UTC · 159 stars
CVE-2026-41089 PoC — Netlogon CLDAP stack buffer overflow (CVSS 9.8 CRITICAL)
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
17:21 UTC about 2 months ago17:21 UTC · about 2 months ago
KEV confirmed by The Shadowserver
Exploitation attested by an external source
-
11:06 UTC about 2 months ago11:06 UTC · about 2 months ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
04:22 UTC about 2 months ago04:22 UTC · about 2 months ago
Public PoC available
Public proof-of-concept code published
-
15:21 UTC 2 months ago15:21 UTC · 2 months ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
16:58 UTC 2 months ago16:58 UTC · 2 months ago
CVE published
Vulnerability disclosed publicly
-
19:12 UTC 3 months ago19:12 UTC · 3 months ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2026-41089
{
"cve_id": "CVE-2026-41089",
"title": "Windows Netlogon Remote Code Execution Vulnerability",
"affected_vendor": "Microsoft",
"affected_product": "Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation)",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "High",
"cvss_score": 9.8,
"epss_score": 0.72253,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}