What it is
CVE-2026-41089 is an unauthenticated Windows Netlogon Remote Code Execution Vulnerability affecting Microsoft Windows Server 2012 and 12 other products. Stack-based buffer overflow in Windows Netlogon allows an...
Vulnerability report
Exploited in the wild
High confidence
Not in CISA KEV
CVE-2026-41089
Windows Netlogon Remote Code Execution Vulnerability
Microsoft / Windows Server 2012 · affected before 6.2.9200.26079
- Severity
- CVSS 9.8 · Critical
- Confidence
- High
- Exploit status
- Exploited in the wild
- EPSS
- 79.6%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is high.
Who is affected?
Microsoft / Windows Server 2012 affected before 6.2.9200.26079.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network
Stack-based buffer overflow in Windows Netlogon allows an unauthorized attacker to execute code over a network.
Vendor
Product
Affected
Status
Microsoft
Windows Server 2012
Before 6.2.9200.26079
Affected
Microsoft
Windows Server 2012 (Server Core installation)
Before 6.2.9200.26079
Affected
Microsoft
Windows Server 2012 R2
Before 6.3.9600.23181
Affected
Microsoft
Windows Server 2012 R2 (Server Core installation)
Before 6.3.9600.23181
Affected
Microsoft
Windows Server 2016
Before 10.0.14393.9140
Affected
Microsoft
Windows Server 2016 (Server Core installation)
Before 10.0.14393.9140
Affected
Microsoft
Windows Server 2019
Before 10.0.17763.8755
Affected
Microsoft
Windows Server 2019 (Server Core installation)
Before 10.0.17763.8755
Affected
Microsoft
Windows Server 2022
Before 10.0.20348.5139
Affected
Microsoft
Windows Server 2022, 23H2 Edition (Server Core installation)
Before 10.0.25398.2330
Affected
Microsoft
Windows Server 2025
Before 10.0.26100.32860
Affected
Microsoft
Windows Server 2025 (Server Core installation)
Before 10.0.26100.32860
Affected
- Published
- 12 May 2026
- Exploitation Reported
- 02 Jun 2026
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- None
- User interaction
- None
Tags
microsoft
windows
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-41089
- Windows Netlogon Remote Code Execution Vulnerability msrc.microsoft.com · Vendor Advisory https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41089
Exploitation evidence
Why KEV Intelligence marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
KEV Intelligence
Independent exploitation attestation added to the KEV Intelligence record.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CERT-EU First | 2026-05-13 15:21 UTC |
| KEV Intelligence | 2026-06-02 11:06 UTC |
| The Shadowserver | 2026-06-02 17:21 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
9.8
Critical
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
EPSS
79.6%
Weaknesses
Timeline
From disclosure to observed exploitation
-
KEV confirmed by The Shadowserver
Exploitation attested by an external source
-
Added to KEV Intelligence KEV Feed
High-confidence, third-party attested exploitation
-
Added to KEV Intelligence KEV Feed
High-confidence, third-party attested exploitation
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2026-41089
Free JSON includes basic KEV fields{
"cve_id": "CVE-2026-41089",
"confidence": "High",
"cvss_score": 9.8,
"cvss_estimated": false,
"epss_score": 0.79622,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.