Microsoft Windows: Denial of service in Remote Procedure Call
Summary
An uncontrolled resource consumption flaw exists in the Windows Remote Procedure Call (RPC) component. An unauthorized remote attacker can exhaust resources over the network and cause a denial of service. The attack complexity is high, and no privileges or user interaction are required. The impact is limited to availability.
Affected
- Windows 10 Version 1607 (10.0.14393.0 to before 10.0.14393.9688)
- Windows 10 Version 1809 (10.0.17763.0 to before 10.0.17763.9487)
- Windows 10 Version 21H2 (10.0.19044.0 to before 10.0.19044.7846)
- Windows 10 Version 22H2 (10.0.19045.0 to before 10.0.19045.7846)
- Windows 11 Version 23H2 (10.0.22631.0 to before 10.0.22631.7711)
- Windows 11 Version 24H2 (10.0.26100.0 to before 10.0.26100.9974)
- Windows 11 Version 25H2 (10.0.26200.0 to before 10.0.26200.9974)
- Windows 11 Version 26H1 (10.0.28000.0 to before 10.0.28000.3501)
- Windows 11 Version 26H2 (10.0.26300.0 to before 10.0.26300.9974)
- Windows Server 2016, including Server Core installation (10.0.14393.0 to before 10.0.14393.9688)
- Windows Server 2019, including Server Core installation (10.0.17763.0 to before 10.0.17763.9487)
- Windows Server 2022 (10.0.20348.0 to before 10.0.20348.5870)
Fixed in
- Install the November 2026 security updates from Microsoft. Fixed builds are listed in the affected versions above. Verify the exact build for each edition in the MSRC Security Update Guide.
Workaround
Unknown.
Exploitation
- No exploitation known at the time of publication.
- Microsoft SSVC assessment: exploitation none, not automatable.
- Rapid7 rates exploitation as less likely.
- Proof-of-concept status: Unknown.
Our recommendation
- Install the November 2026 security updates on all affected Windows systems. Prioritize internet-facing hosts and domain controllers.
- Block RPC ports (TCP 135 and the dynamic high ports) at the perimeter and between network zones.
- Monitor for unusual RPC traffic and unexpected service crashes.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Denial of service – Windows Remote Procedure Call
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5131291, KB5131085, KB5131096, KB5131090, KB5131087, KB5132061
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-119972 msrc.microsoft.com
- CVE.org CVE Record: CVE-2026-119972 www.cve.org
- Rapid7: Patch Tuesday November 2026 www.rapid7.com
- SANS ISC diary isc.sans.edu
- Senserva: KB5132059 senserva.com
- Strix: CVE-2026-119972 (secondary) 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, 15:13.
Original description (NVD)
Uncontrolled resource consumption in Windows Remote Procedure Call allows an unauthorized attacker to deny service over a network.
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.
Affected? We can help.
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