CVE-2026-63117

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 67% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

August 19, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Aug 19, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available

Denial of service through ADPCM frame size calculation · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v64m-xxfw-hrv6
github_release Patch Available

3.28.0

Patch available: FreeRDP/FreeRDP 3.28.0

https://github.com/FreeRDP/FreeRDP/releases/tag/3.28.0
github_pr

Cliprdr and rdpsnd fixes

Fix merged in FreeRDP/FreeRDP PR #12980 on 2026-06-29 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/pull/12980
github_commit

commit b78fc0b138fe (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit b78fc0b138fe — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/b78fc0b138fe8f08a8b102e193ffb32986f4449a

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
freerdp22.10.0+dfsg1-1 ... 2.11.7+dfsg1-6~deb12u1 (13 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
freerdp33.15.0+dfsg-2.1 ... 3.31.0+dfsg-1 (44 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
freerdp33.15.0+dfsg-2.1 ... 3.27.1+dfsg-1 (35 versions)3.28.0+dfsg-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 10:46 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 09:25 UTCEG score recompute
  4. 2026-09-17 08:13 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 06:59 UTCEG score recompute
  7. 2026-09-16 05:15 UTCEPSS rescore
  8. 2026-09-15 05:48 UTCEG score recompute
  9. 2026-09-14 03:56 UTCEG score recompute
  10. 2026-09-13 02:46 UTCEG score recompute
  11. 2026-09-12 01:35 UTCEG score recompute
  12. 2026-09-11 14:53 UTCEPSS rescore
  13. 2026-09-11 09:37 UTCEPSS rescore
  14. 2026-09-11 00:24 UTCEG score recompute
  15. 2026-09-09 02:34 UTCEG score recompute
  16. 2026-09-08 22:01 UTCEPSS rescore
  17. 2026-09-07 17:31 UTCEG score recompute
  18. 2026-09-07 16:01 UTCEPSS rescore
  19. 2026-09-06 16:20 UTCEG score recompute
  20. 2026-09-06 13:47 UTCEPSS rescore
  21. 2026-09-05 15:31 UTCEPSS rescore
  22. 2026-09-05 15:08 UTCEG score recompute
  23. 2026-09-04 13:48 UTCEG score recompute
  24. 2026-09-04 05:07 UTCEPSS rescore
  25. 2026-09-03 12:34 UTCEG score recompute
Show 29 more
  1. 2026-09-02 14:12 UTCEPSS rescore
  2. 2026-09-02 11:23 UTCEG score recompute
  3. 2026-09-01 13:54 UTCEPSS rescore
  4. 2026-09-01 10:10 UTCEG score recompute
  5. 2026-09-01 04:40 UTCEPSS rescore
  6. 2026-08-31 08:58 UTCEG score recompute
  7. 2026-08-30 19:17 UTCEPSS rescore
  8. 2026-08-30 07:11 UTCEG score recompute
  9. 2026-08-30 01:22 UTCEPSS rescore
  10. 2026-08-29 06:00 UTCEG score recompute
  11. 2026-08-28 21:42 UTCEPSS rescore
  12. 2026-08-28 04:48 UTCEG score recompute
  13. 2026-08-27 14:25 UTCEPSS rescore
  14. 2026-08-27 03:37 UTCEG score recompute
  15. 2026-08-26 14:46 UTCEPSS rescore
  16. 2026-08-26 02:25 UTCEG score recompute
  17. 2026-08-25 13:49 UTCEPSS rescore
  18. 2026-08-25 01:14 UTCEG score recompute
  19. 2026-08-24 00:03 UTCEG score recompute
  20. 2026-08-23 00:19 UTCEPSS rescore
  21. 2026-08-22 22:52 UTCEG score recompute
  22. 2026-08-21 23:49 UTCEPSS rescore
  23. 2026-08-21 21:41 UTCEG score recompute
  24. 2026-08-20 22:55 UTCEPSS rescore
  25. 2026-08-19 19:19 UTCEG score recompute
  26. 2026-08-19 18:58 UTCEG score recompute
  27. 2026-08-19 18:18 UTCEG score recompute
  28. 2026-08-19 18:04 UTCEG score recompute
  29. 2026-08-19 18:02 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-63117?
CVE-2026-63117 is a medium vulnerability published on August 19, 2026. 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 rdpsndserverselectformat in channels/rdpsnd/server/rdpsndmain.c equal zero. The…
When was CVE-2026-63117 disclosed?
CVE-2026-63117 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63117 actively exploited?
CVE-2026-63117 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 67.1% of all scored CVEs.
What is the CVSS score of CVE-2026-63117?
CVE-2026-63117 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-63117?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63117, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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