Windows DNS Server Remote Code Execution Vulnerability
Published August 11, 2026Updated September 8, 2026
Source data
Overview
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows DNS allows an authorized attacker to execute code over a network.
Impact & technical details
Remote Code Execution
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires an attacker to win a race condition.
- CVSS base score
- 6.6 / 10
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Highest base score supplied by MSRC for this record; the vector belongs to that score. Ratings can vary by product. Microsoft Important is displayed as High; Moderate is displayed as Medium.
Affected products
- 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 (Server Core installation)
Show all 10 affected products
- Windows Server 2025
- Windows Server 2025 (Server Core installation)
Source guidance
Remediation
The source provides update references without a separate remediation summary. Review the applicable update links below.
At least one Microsoft vendor-fix reference is available. Check each affected product for its applicable update, prerequisites, and supported version.
GTP recommendation · Rule-based guidance
Recommended next step
Review affected Microsoft products and apply the applicable security updates through your organization's normal patch-management process. Confirm availability and prerequisites in the Microsoft advisory.
Authoritative sources & updates
Findings and update information come from the linked publishers. GTP compiles the public record and provides the recommendation above. CVSS ratings shown here come from Microsoft. NVD references provide additional public context.
- Microsoft Security Response Center (opens in a new tab)
- Microsoft security update · 5120238 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5120242 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5120229 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5120233 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5120228 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5120418 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
- Microsoft security update · 5120385 (opens in a new tab)
- Microsoft remediation guidance (opens in a new tab)
Managed by GTP?
Griffin Technology Partners managed customers may receive additional environment-specific security guidance and remediation assistance through their managed services relationship.
Security bulletins are provided for informational purposes and compiled from authoritative public sources. Vulnerability applicability varies by environment. Validate affected products, configuration, compatibility requirements, and vendor guidance before making production changes.