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CVE-2026-49164

Windows Active Directory Domain Services Remote Code Execution Vulnerability

Published: Jul 14, 2026Updated: Jul 16, 2026 Sources: CVE List NVDCWE-122
8.1HIGH
NVD MITRE
EPSS Score
0.6%
Top 54.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Heap-based buffer overflow in Active Directory Domain Services allows an unauthorized attacker to execute code over a network.

In plain language

AI Act now

This is a Windows Active Directory Domain Services flaw that could let an outsider run code on your server without needing an account; if you run AD DS, you should treat it as serious and plan to patch soon.

Executive summary

CVE-2026-49164 is an unauthenticated, network-triggered heap-based buffer overflow in Windows Active Directory Domain Services (CWE-122) that can lead to remote code execution on affected systems.

If affected, business impact
Full server takeover possibleDomain control compromiseService disruptionWormable spread risk within domain

What to do now

  1. Check whether the affected Windows machine is running Active Directory Domain Services (AD DS) and confirm its exact Windows version/build.
  2. Compare the machine’s version/build to the fixed versions listed below and determine whether it is still vulnerable.
  3. Apply the available updates/patches to reach one of the fixed versions for your specific Windows edition.
  4. After patching, verify AD DS remains healthy and that the system reboots/finishes update installation successfully.
Usually a quick update

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-122

Affected Products

Microsoft
commercial·US
Windows 10 Version 1607On-premOS
Operating Systems / windows
Windows 11 Version 24H2On-premOS
Operating Systems / windows
Windows Server 2012 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2012 R2 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2016 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2019 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2022On-premOS
Operating Systems / windows
Windows Server 2025 (Server Core installation)On-premOS
Operating Systems / windows
and 22 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-49164?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49164
msrc.microsoft.com
News mentions
4

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