CVE-2026-54982

Microsoft · Published July 14, 2026

8.8

CVSS v3.1

HIGH

Patch availableGet patch

Description

Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability. Integer underflow (wrap or wraparound) in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over an adjacent network.

Affected Products

Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2019
Windows Server 2019 (Server Core installation)

CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C