Windows Server: Use-after-free in Remote Desktop Gateway Service
Summary
A use-after-free vulnerability in the Remote Desktop Gateway Service of Windows Server allows an attacker to execute code. According to the CVSS vector, the attack requires local access and high complexity, but no privileges or user interaction. An attacker with a foothold on an affected server could take over the system, and the flaw is not directly reachable from the internet. Microsoft reports no public disclosure and no exploitation so far.
Affected
- Windows Server 2016 and 2016 Server Core: before 10.0.14393.9688
- Windows Server 2019 and 2019 Server Core: before 10.0.17763.9487
- Windows Server 2022: before 10.0.20348.5870 (per third-party tracker, not verified in the Microsoft record)
- Windows Server 2025 and 2025 Server Core: before 10.0.26100.33822 (per third-party tracker, unverified)
- Windows 10, Windows 11 and client editions: Unknown.
Fixed in
- Install the current cumulative security update for each affected build from the Microsoft Security Update Guide.
- KB article numbers: Unknown.
Workaround
Unknown.
Exploitation
- Microsoft: not publicly disclosed, not exploited, exploitability rated Exploitation Less Likely, exploit maturity Unproven.
- No public proof of concept and no CISA KEV listing found at the time of research.
Our recommendation
- Patch all affected Windows Server hosts running Remote Desktop Gateway, starting with internet-facing gateways.
- Verify Server 2022 and Server 2025 build numbers against the Microsoft advisory before rollout.
- If RD Gateway is not in use, disable the role.
- If it is in use, restrict access to the gateway and monitor it for suspicious activity.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Remote code execution – Remote Desktop Gateway Service
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5131085, KB5131090, KB5131080, KB5131077, KB5131291
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-69327 msrc.microsoft.com
- CVE.org record CVE-2026-69327 www.cve.org
- Strix CVE-2026-69327 (third-party) www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 06:17.
Original description (NVD)
Use after free in Remote Desktop Gateway Service allows an unauthorized attacker to execute code locally.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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