CVE-2026-63117

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (44th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
6.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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 (value × EchelonGraph’s weight)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.6%
EPSS %ILE
44th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 19, 2026

Last Modified

September 24, 2026

Advisory Details (4)

Auto-updated Aug 19, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
GitHub advisoryMentions a patch (unverified)

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 pull request

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 rangeFix by version rangeDependents
freerdp22.10.0+dfsg1-1 ... 2.11.7+dfsg1-6~deb12u1 (13 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp33.15.0+dfsg-2.1 ... 3.32.0+dfsg-1 (47 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp33.15.0+dfsg-2.1 ... 3.27.1+dfsg-1 (35 versions)
  • every version up to 3.28.0+dfsg-1: fixed in 3.28.0+dfsg-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 43× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  3. 2026-10-12 15:49 UTCEG score recompute
  4. 2026-10-11 19:33 UTCEG score recompute
  5. 2026-10-11 16:48 UTCEG score recompute
  6. 2026-10-11 14:10 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  12. 2026-10-07 10:26 UTCEG score recompute
  13. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  14. 2026-10-06 07:57 UTCEG score recompute
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  17. 2026-10-03 16:55 UTCEG score recompute
  18. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  19. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  20. 2026-10-02 11:07 UTCEG score recompute
  21. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  22. 2026-10-01 09:53 UTCEG score recompute
  23. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 44th percentile
  24. 2026-09-30 08:43 UTCEG score recompute
  25. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
Show 64 more
  1. 2026-09-28 08:08 UTCEG score recompute
  2. 2026-09-27 06:55 UTCEG score recompute
  3. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 43rd percentile
  4. 2026-09-24 15:14 UTCEG score recompute
  5. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  6. 2026-09-23 16:13 UTCEG score recompute
  7. 2026-09-22 15:03 UTCEG score recompute
  8. 2026-09-21 13:51 UTCEG score recompute
  9. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  10. 2026-09-20 12:38 UTCEG score recompute
  11. 2026-09-19 10:46 UTCEG score recompute
  12. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  13. 2026-09-18 09:25 UTCEG score recompute
  14. 2026-09-17 08:13 UTCEG score recompute
  15. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  16. 2026-09-16 06:59 UTCEG score recompute
  17. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  18. 2026-09-15 05:48 UTCEG score recompute
  19. 2026-09-14 03:56 UTCEG score recompute
  20. 2026-09-13 02:46 UTCEG score recompute
  21. 2026-09-12 01:35 UTCEG score recompute
  22. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  23. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  24. 2026-09-11 00:24 UTCEG score recompute
  25. 2026-09-09 02:34 UTCEG score recompute
  26. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  27. 2026-09-07 17:31 UTCEG score recompute
  28. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  29. 2026-09-06 16:20 UTCEG score recompute
  30. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  31. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  32. 2026-09-05 15:08 UTCEG score recompute
  33. 2026-09-04 13:48 UTCEG score recompute
  34. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  35. 2026-09-03 12:34 UTCEG score recompute
  36. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  37. 2026-09-02 11:23 UTCEG score recompute
  38. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  39. 2026-09-01 10:10 UTCEG score recompute
  40. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  41. 2026-08-31 08:58 UTCEG score recompute
  42. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  43. 2026-08-30 07:11 UTCEG score recompute
  44. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  45. 2026-08-29 06:00 UTCEG score recompute
  46. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  47. 2026-08-28 04:48 UTCEG score recompute
  48. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  49. 2026-08-27 03:37 UTCEG score recompute
  50. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  51. 2026-08-26 02:25 UTCEG score recompute
  52. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  53. 2026-08-25 01:14 UTCEG score recompute
  54. 2026-08-24 00:03 UTCEG score recompute
  55. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  56. 2026-08-22 22:52 UTCEG score recompute
  57. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  58. 2026-08-21 21:41 UTCEG score recompute
  59. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  60. 2026-08-19 19:19 UTCEG score recompute
  61. 2026-08-19 18:58 UTCEG score recompute
  62. 2026-08-19 18:18 UTCEG score recompute
  63. 2026-08-19 18:04 UTCEG score recomputeFirst assessed: 6.5 MEDIUM
  64. 2026-08-19 18:02 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-63117?
CVE-2026-63117 is a medium-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-63117 published?
The CVE record for CVE-2026-63117 was published on August 19, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 24, 2026; the record at its source may have been updated since.
Is CVE-2026-63117 actively exploited?
CVE-2026-63117 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63117?
CVE-2026-63117 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-63117?
A fix for CVE-2026-63117 is available: update to the fixed version the vendor names in its advisory.

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