# Windows DNS Server Remote Code Execution Vulnerability CVE record · `CVE-2026-69551` - **Identifiers:** `CVE-2026-69551` - **State:** Confirmed - **Severity:** CVSS 8.8 High - **Critical:** No - **CNA:** microsoft - **Weakness (CWE):** [CWE-416](https://cwe.mitre.org/data/definitions/416.html) - **Tags:** [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md) - **Technologies:** [Microsoft Windows 10 Version 1607](https://agentprime.io/advisories/technology/microsoft-windows-10-version-1607.md) · [Microsoft Windows 10 Version 1809](https://agentprime.io/advisories/technology/microsoft-windows-10-version-1809.md) · [Microsoft Windows Server 2012](https://agentprime.io/advisories/technology/microsoft-windows-server-2012.md) · [Microsoft Windows Server 2012 (Server Core installation)](https://agentprime.io/advisories/technology/microsoft-windows-server-2012-server-core-installation.md) · [Microsoft Windows Server 2012 R2](https://agentprime.io/advisories/technology/microsoft-windows-server-2012-r2.md) · [Microsoft Windows Server 2012 R2 (Server Core installation)](https://agentprime.io/advisories/technology/microsoft-windows-server-2012-r2-server-core-installation.md) · [Microsoft Windows Server 2016](https://agentprime.io/advisories/technology/microsoft-windows-server-2016.md) · [Microsoft Windows Server 2016 (Server Core installation)](https://agentprime.io/advisories/technology/microsoft-windows-server-2016-server-core-installation.md) · [Microsoft Windows Server 2019](https://agentprime.io/advisories/technology/microsoft-windows-server-2019.md) · [Microsoft Windows Server 2019 (Server Core installation)](https://agentprime.io/advisories/technology/microsoft-windows-server-2019-server-core-installation.md) · [Microsoft Windows Server 2022](https://agentprime.io/advisories/technology/microsoft-windows-server-2022.md) · [Microsoft Windows Server 2025](https://agentprime.io/advisories/technology/microsoft-windows-server-2025.md) · [Microsoft Windows Server 2025 (Server Core installation)](https://agentprime.io/advisories/technology/microsoft-windows-server-2025-server-core-installation.md) - **Published:** 8 Sept 2026 - **Updated:** 10 Nov 2026 - **Reviewed by a person:** No Published by the CVE Program (CNA: microsoft) at 8 Sept 2026, 17:11 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. ## Affected products, as the CNA wrote them - Vendor: Microsoft. Product: Windows 10 Version 1607. - affected: `10.0.14393.0 to before 10.0.14393.9512` (custom) - Vendor: Microsoft. Product: Windows 10 Version 1809. - affected: `10.0.17763.0 to before 10.0.17763.9245` (custom) - Vendor: Microsoft. Product: Windows Server 2012. - affected: `6.2.9200.0 to before 6.2.9200.26349` (custom) - Vendor: Microsoft. Product: Windows Server 2012 (Server Core installation). - affected: `6.2.9200.0 to before 6.2.9200.26349` (custom) - Vendor: Microsoft. Product: Windows Server 2012 R2. - affected: `6.3.9600.0 to before 6.3.9600.23398` (custom) - Vendor: Microsoft. Product: Windows Server 2012 R2 (Server Core installation). - affected: `6.3.9600.0 to before 6.3.9600.23398` (custom) - Vendor: Microsoft. Product: Windows Server 2016. - affected: `10.0.14393.0 to before 10.0.14393.9512` (custom) - Vendor: Microsoft. Product: Windows Server 2016 (Server Core installation). - affected: `10.0.14393.0 to before 10.0.14393.9512` (custom) - Vendor: Microsoft. Product: Windows Server 2019. - affected: `10.0.17763.0 to before 10.0.17763.9245` (custom) - Vendor: Microsoft. Product: Windows Server 2019 (Server Core installation). - affected: `10.0.17763.0 to before 10.0.17763.9245` (custom) - Vendor: Microsoft. Product: Windows Server 2022. - affected: `10.0.20348.0 to before 10.0.20348.5622` (custom) - Vendor: Microsoft. Product: Windows Server 2025. - affected: `10.0.26100.0 to before 10.0.26100.33438` (custom) - Vendor: Microsoft. Product: Windows Server 2025 (Server Core installation). - affected: `10.0.26100.0 to before 10.0.26100.33438` (custom) ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Windows DNS Server on Windows 10 Version 1607 and 1809, Windows Server 2012, 2012 R2, 2016 and 2019 (including Server Core installations) is affected, in the listed builds before the fixed versions. An authorized attacker can exploit a use-after-free flaw over the network to execute code. Upgrade to the fixed builds: 10.0.14393.9512 for Windows 10 1607 and Server 2016, 10.0.17763.9245 for Windows 10 1809 and Server 2019, 6.2.9200.26349 for Server 2012, and 6.3.9600.23398 for Server 2012 R2. Written 10 Nov 2026. ## Not analysed yet We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter. ## Severity and exploitation - 8.8 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`, from CNA (microsoft) - **CISA KEV:** Not listed. - **EPSS:** 0.0091, the 60th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 8 Sept 2026, 17:11 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-69551) - 31 Oct 2026, 16:20 UTC: First seen by agentprime ## Sources - [CVE List: CVE-2026-69551](https://www.cve.org/CVERecord?id=CVE-2026-69551) - [NVD: CVE-2026-69551](https://nvd.nist.gov/vuln/detail/CVE-2026-69551) ### References from the CNA - (vendor-advisory, patch) Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description. ## Check whether this affects you This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run. - With the agentprime MCP server (), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: - As JSON: - Everything that needs attention now: --- The web page: . Everything for agents: .