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CVE-2026-63117 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/FreeRDP/FreeRDP/commit/b78fc0b138fe8f08a8b102e193ffb32986f4449a	[email protected]	Patch
https://github.com/FreeRDP/FreeRDP/pull/12980	[email protected]	Issue TrackingPatch
https://github.com/FreeRDP/FreeRDP/releases/tag/3.28.0	[email protected]	Release Notes
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v64m-xxfw-hrv6	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-369	Divide By Zero	[email protected]

Affected Products

Product	Versions
freerdp freerdp	< 3.28.0
CPE cpe:2.3:a:freerdp:freerdp:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Sep 24, 2026	Initial Analysis	[email protected]
Aug 19, 2026	CVE Modified	CISA-ADP
Aug 19, 2026	New CVE Received	[email protected]