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Vulnerability · Published Aug 19, 2026 · Assigned by GitHub_M

CVE-2026-63117FreeRDP: Denial of service through ADPCM frame size calculation

Medium 6.5

In plain English

A medium-severity security flaw in FreeRDP from FreeRDP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.6%top 53.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12freerdp2no fix listedDEBIAN-CVE-2026-63117
Debian:13freerdp3no fix listedDEBIAN-CVE-2026-63117
Debian:14freerdp33.28.0+dfsg-1DEBIAN-CVE-2026-63117
Ubuntu:22.04:LTSfreerdp2no fix listedUBUNTU-CVE-2026-63117
Ubuntu:24.04:LTSfreerdp33.30.0+dfsg-0ubuntu0.24.04.1UBUNTU-CVE-2026-63117
Ubuntu:26.04:LTSfreerdp33.30.0+dfsg-0ubuntu0.26.04.1UBUNTU-CVE-2026-63117

Affected products (as reported)

VendorProductVersions
FreeRDP FreeRDP < 3.28.0

Weakness: CWE-369 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References