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CVE-2026-84012 Microsoft CVE debrief

A double free vulnerability in Remote Desktop Gateway Service allows an unauthorized attacker to execute code over a network. This issue affects multiple Windows and Windows Server versions. Microsoft has released patches for this vulnerability. The vulnerability is a high-severity issue, with a CVSS score of 8.1, and can be exploited over a network, making it critical for internet-facing systems and those on untrusted networks. System administrators and security teams should assess exposure and apply patches immediately, especially for internet-facing systems or those on untrusted networks. The CVE Program and NVD provide official records of this vulnerability, and Microsoft has a

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

System administrators and security teams responsible for Windows and Windows Server systems should assess exposure and apply patches. This vulnerability can be exploited over a network, making it critical for internet-facing systems and those on untrusted networks.

Why it matters

CVE-2026-84012 is a high-severity vulnerability in Windows Remote Desktop Services that allows remote code execution. System administrators and security teams should assess exposure and apply patches immediately, especially for internet-facing systems or those on untrusted networks.

  • Apply patches for affected systems to prevent code execution
  • Verify system exposure and ensure systems are updated
  • Review and update incident response plans for potential exploitation

Technical summary

The CVE-2026-84012 vulnerability is a double free issue in Remote Desktop Gateway Service. An unauthorized attacker can exploit this vulnerability to execute code over a network. Affected systems include Windows 10 Version 1607, Windows 10 Version 1809, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025.

Defensive priority

Apply patches immediately for affected Windows and Windows Server systems, especially those exposed to the internet or untrusted networks.

Recommended defensive actions

  • Apply patches for affected Windows and Windows Server systems
  • Verify and apply patches for Windows 10 Version 1607, Windows 10 Version 1809, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025
  • Review system exposure and ensure systems are updated

Evidence notes

The CVE Program and NVD provide official records of this vulnerability. Microsoft has released a patch for this issue. The vulnerability is a double free issue in Remote Desktop Gateway Service, allowing an unauthorized attacker to execute code over a network. Affected systems include Windows 10 Version 1607, Windows 10 Version 1809, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025. The evidence for this

Sources and references

Verified primary and authoritative sources

  • CVE-2026-84012 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-84012

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-84012 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-84012

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.