6.5

CVE-2026-63117: freerdp Divide By Zero

CVSS: 6.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-63117DEBIAN-CVE-2026-63117
Published 19-08-2026Last modified 19-08-2026
Open JSON

Vulnerability summary

CVE-2026-63117 is a medium (CVSS 6.5) Divide By Zero vulnerability in freerdp. EPSS estimates a 0.55% chance of exploitation in the next 30 days, higher than 45.2% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.55%
0%100%
Low · +0.16 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:11385-1

Timeline

  1. 19-08-2026
    PublishedVulnerability first disclosed.
  2. 19-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.55%

Chance of exploitation in the next 30 days

Percentile

45%

Versus all other CVEs

30-day change

+0.16 pp

From 0.39% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.55%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu3 products
  • freerdpAll versions (No fix recorded)
  • freerdp2All versions (No fix recorded)
  • freerdp3< 3.30.0+dfsg-0ubuntu0.24.04.1 | < 3.30.0+dfsg-0ubuntu0.26.04.1
Debian2 products
  • freerdp2All versions (No fix recorded)
  • freerdp3All versions (No fix recorded) | < 3.28.0+dfsg-1
Freerdp1 product

3 vendors · 6 products

References

7 links