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Vulnerabilities

Vulnerability · CVE-2026-41089

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

Published May 12, 2026 · catalog updated Jun 17, 2026 · windows server 2012

Patch now

CVE-2026-41089 is in the CISA known-exploited catalog. Confirm windows server 2012 against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.97%
Remediation
Remediation guidance
Affected products
cpe microsoft/windows server 2012 · cpe microsoft/windows server 2016 · cpe microsoft/windows server 2019 · cpe microsoft/windows server 2022 · cpe microsoft/windows server 2022 23h2 · cpe microsoft/windows server 2025

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/windows server 2012r2
  • cpe microsoft/windows server 2016version unspecified
  • cpe microsoft/windows server 2019version unspecified
  • cpe microsoft/windows server 2022version unspecified
  • cpe microsoft/windows server 2022 23h2version unspecified
  • cpe microsoft/windows server 2025version unspecified
  • vendor Microsoft Windowsversion unspecified

How to fix CVE-2026-41089

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-41089 is in the CISA known-exploited catalog. Confirm windows server 2012 against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with microsoft/windows server 2012 r2. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-121: Stack-based Buffer Overflow. EPSS 0.97%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 12, 2026 · NIST NVD

    Detected

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

  2. May 29, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  3. Jun 17, 2026 · NIST NVD

    Updated

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

Sources

  • CVE.orgVulnerability recordCVE-2026-41089

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-41089

    30-day exploitation probability 1.0%

    first.org
  • NIST NVDVulnerability recordCVE-2026-41089

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

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2026-41089

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

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.