Windows: Denial of Service in Link-Layer Discovery Protocol (LLDP)

Summary

The Link-Layer Discovery Protocol (LLDP) component of Microsoft Windows and Windows Server contains an untrusted pointer dereference. An unauthorized attacker on the same adjacent network can exploit it to crash or disrupt the affected system. The attack is complex and requires no privileges or user interaction; the only impact is 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 (10.0.14393.0 to before 10.0.14393.9688)
• Windows Server 2019, including Server Core (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

• Fixed builds are not confirmed in this entry. Check the MSRC Security Updates table for each product.
• Unverified candidates: KB5132061 (Windows 11 24H2/25H2/26H2), KB5132059 (Windows 11 26H1), KB5131087 (Windows 11 23H2), KB5131080 (Windows Server 2025, third-party source only).
• KB numbers for Windows 10 and Windows Server 2016/2019/2022: Unknown.

Workaround

• No vendor workaround documented. Patching is the fix.
• Interim measure: keep untrusted devices and guests off the same switched segment as Windows systems, and limit LLDP to ports that need it. Confirm changes with your network team first.

Exploitation

• Not known to be exploited in the wild.
• CISA SSVC: exploitation none, not automatable, partial technical impact.
• No public proof of concept found.

Our recommendation

• Patch affected Windows systems in the normal monthly cycle; prioritize hosts on shared or untrusted network segments, such as reception PCs.
• Verify the fixed build for each product in the MSRC advisory before rollout.
• Check whether Windows 10 systems are enrolled in Extended Security Updates and patch them as well.
• Restrict LLDP and untrusted devices on the local network as an interim measure.

Public exploits iAttack code is publicly available (PoC on GitHub, Metasploit or Exploit-DB).

PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.

Research sources

• MSRC Security Update Guide: CVE-2026-112975 msrc.microsoft.com
• CVE.org record CVE-2026-112975 www.cve.org
• Rapid7: Patch Tuesday November 2026 www.rapid7.com
• BleepingComputer: Microsoft November 2026 Patch Tuesday www.bleepingcomputer.com
• Microsoft KB5132061: Windows 11 24H2/25H2/26H2 security update support.microsoft.com
• Microsoft KB5132059: Windows 11 26H1 security update support.microsoft.com

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, 18:34.