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9.8
CVE-2026-62878: Windows DNS Server Remote Code Execution
CVE-2026-62878 · published 23 days ago
Summary
An attacker can execute malicious code on your DNS server if they gain access to it. This is a serious concern because an attacker could then access and control your network. To protect yourself, ensure that your DNS server is properly secured and patched with the latest updates.
What to do
- Update microsoft windows_10_1607 to version 10.0.14393.9418 or later.
- Update microsoft windows_10_1809 to version 10.0.17763.9121 or later.
- Update microsoft windows_server_2016 to version 10.0.14393.9418 or later.
- Update microsoft windows_server_2019 to version 10.0.17763.9121 or later.
- Update microsoft windows_server_2022 to version 10.0.20348.5440 or later.
- Update microsoft windows_server_2025 to version 10.0.26100.33222 or later.
- Update microsoft windows 10 version 1607 to version 10.0.14393.9418 or later.
- Update microsoft windows server 2016 to version 10.0.14393.9418 or later.
- Update microsoft windows server 2016 (server core installation) to version 10.0.14393.9418 or later.
- Update microsoft windows server 2022 to version 10.0.20348.5499 or later.
- Update microsoft windows server 2025 to version 10.0.26100.33296 or later.
- Update microsoft windows server 2025 (server core installation) to version 10.0.26100.33296 or later.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| microsoft | windows_10_1607 |
< 10.0.14393.9418 cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:* |
| microsoft | windows_10_1809 |
< 10.0.17763.9121 cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* |
| microsoft | windows_server_2012 |
r2 cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* |
| microsoft | windows_server_2016 |
< 10.0.14393.9418 cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* |
| microsoft | windows_server_2019 |
< 10.0.17763.9121 cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* |
| microsoft | windows_server_2022 |
< 10.0.20348.5440 cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* |
| microsoft | windows_server_2025 |
< 10.0.26100.33222 cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:* |
| microsoft | windows 10 version 1607 | < 10.0.14393.9418 |
| microsoft | windows 10 version 1809 |
< 10.0.17763.9115 < 10.0.17763.9121 |
| microsoft | windows server 2012 |
< 6.2.9200.26279 < 6.2.9200.26280 |
| microsoft | windows server 2012 (server core installation) |
< 6.2.9200.26279 < 6.2.9200.26280 |
| microsoft | windows server 2012 r2 |
< 6.3.9600.23337 < 6.3.9600.23338 |
| microsoft | windows server 2012 r2 (server core installation) |
< 6.3.9600.23337 < 6.3.9600.23338 |
| microsoft | windows server 2016 | < 10.0.14393.9418 |
| microsoft | windows server 2016 (server core installation) | < 10.0.14393.9418 |
| microsoft | windows server 2019 |
< 10.0.17763.9115 < 10.0.17763.9121 |
| microsoft | windows server 2019 (server core installation) |
< 10.0.17763.9115 < 10.0.17763.9121 |
| microsoft | windows server 2022 | < 10.0.20348.5499 |
| microsoft | windows server 2025 | < 10.0.26100.33296 |
| microsoft | windows server 2025 (server core installation) | < 10.0.26100.33296 |
Original advisory text
Windows DNS Server Remote Code Execution Vulnerability
Stack-based buffer overflow in Windows DNS allows an unauthorized attacker to execute code over a network.
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62878 vendor-advisory patch
Severity
9.8
Critical
CVSS 3.1: 9.8 (MITRE)
Exploitation
EPSS 1%
Type
CWE-121Stack-based Buffer Overflow
Timeline
Published11 Aug 2026
Updated2 Sep 2026
First seen11 Aug 2026
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