CVE-2026-63117: Freerdp

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, an authenticated RDP client can advertise DVI ADPCM with nBlockAlign equal to 8 and nChannels equal to 2 to make the `bs` calculation in rdpsnd_server_select_format in channels/rdpsnd/server/rdpsnd_main.c equal zero. The subsequent out_frames modulo `bs` operation raises SIGFPE and terminates the server-side rdpsnd channel process. This vulnerability fixed in 3.28.0.

Affected products

• Freerdp Freerdp: before 3.28.0 (fixed in 3.28.0)

Published 2026-08-19. Last modified 2026-09-24.