Vulnerability in Freerdp
CVE-2026-63117
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Freerdp — versions < 3.28.0
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v64m-xxfw-hrv6 (Vendor Advisory)
- github.com/FreeRDP/FreeRDP/pull/12980 (Patch, Issue Tracking)
- github.com/FreeRDP/FreeRDP/commit/b78fc0b138fe8f08a8b102e193ffb32986f4449a (Patch)
- github.com/FreeRDP/FreeRDP/releases/tag/3.28.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-63117?
- CVE-2026-63117 is a medium-severity vulnerability in Freerdp, classified under Divide By Zero. CVSS score: 6.5/10. Published 2026-08-19.
- How severe is CVE-2026-63117?
- Medium severity. CVSS v3 base score is 6.5 out of 10.