CVE-2026-63652

MEDIUMNVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.6% (48th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated

Also known asEUVD-2026-62671 (ENISA EUVD)Source: ENISA EUVD

6.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 6.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.28.0, rdpsnd_server_recv_formats in channels/rdpsnd/server/rdpsnd_main.c frees context->client_formats on a malformed Client Audio Formats PDU without clearing the owning pointer or num_client_formats. An authenticated RDP client can trigger an error such as a cbSize larger than the remaining record, leave the dangling pointer in the server context, and cause rdpsnd_server_context_free to free the same allocation again at session teardown. This reliably terminates the server and can create allocator-dependent heap corruption. This issue is fixed in version 3.28.0.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
45
EG Risk 45/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity65% × 45%
Impact severity (EG Severity): CVSS 6.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (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
48th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.5): severity, escalated by confirmed exploitation. This CVE's 6.5 is its impact severity (EG Severity), not escalated.

EG Severity
6.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation public PoC (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.

The score's inputs: 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

October 26, 2026

Advisory Details (4)

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

Double-free of `client_formats` in the rdpsnd server channel on a malformed Client Audio Formats PDU · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9g22-w2gr-vcmp
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

Range checks

Fix merged in FreeRDP/FreeRDP PR #12993 on 2026-07-02 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/pull/12993
GitHub commit

commit caf653c0ba1c (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit caf653c0ba1c — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/caf653c0ba1c75ec8f298d1baa59770102a5d14c

Vendor Advisories for CVE-2026-63652(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatfreerdp-2:3.10.3-3.el10_0.162026-09-17redhat
redhatfreerdp-2:3.10.3-12.el10_2.102026-08-31redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

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 ... 3.32.2+dfsg-1 (50 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 7× in last 7d / 33× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 190 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 90 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:53 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  2. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  3. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  4. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  5. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  6. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  7. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  8. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  9. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  10. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  11. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  12. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  13. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  14. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  15. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  16. 2026-10-29 16:41 UTCEchelonGraph re-scored
  17. 2026-10-29 16:41 UTCVendor advisory
  18. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  19. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  20. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  21. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  22. 2026-10-26 11:30 UTCEchelonGraph re-scored
  23. 2026-10-26 11:30 UTCVendor advisory
  24. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  25. 2026-10-25 14:13 UTCEchelonGraph re-scored
Show 75 more
  1. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  2. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  3. 2026-10-22 19:49 UTCEchelonGraph re-scored
  4. 2026-10-22 19:49 UTCVendor advisory
  5. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  6. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  7. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  8. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  9. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  10. 2026-10-18 03:23 UTCEchelonGraph re-scored
  11. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  12. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  13. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  14. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  15. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  16. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  17. 2026-10-12 15:48 UTCEchelonGraph re-scored
  18. 2026-10-11 19:33 UTCEchelonGraph re-scored
  19. 2026-10-11 16:48 UTCEchelonGraph re-scored
  20. 2026-10-11 14:10 UTCEchelonGraph re-scored
  21. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  22. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  23. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  24. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  25. 2026-10-08 07:40 UTCEchelonGraph re-scored
  26. 2026-10-08 07:40 UTCVendor advisory
  27. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  28. 2026-10-07 05:58 UTCEchelonGraph re-scored
  29. 2026-10-07 05:58 UTCVendor advisory
  30. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  31. 2026-10-06 07:57 UTCEchelonGraph re-scored
  32. 2026-10-06 07:57 UTCVendor advisory
  33. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  34. 2026-10-05 01:45 UTCEchelonGraph re-scored
  35. 2026-10-05 01:45 UTCVendor advisory
  36. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  37. 2026-10-04 03:12 UTCEchelonGraph re-scored
  38. 2026-10-04 03:12 UTCVendor advisory
  39. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  40. 2026-10-03 05:14 UTCEchelonGraph re-scored
  41. 2026-10-03 05:14 UTCVendor advisory
  42. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  43. 2026-10-02 06:51 UTCEchelonGraph re-scored
  44. 2026-10-02 06:51 UTCVendor advisory
  45. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  46. 2026-10-01 06:42 UTCEchelonGraph re-scored
  47. 2026-10-01 06:42 UTCVendor advisory
  48. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  49. 2026-09-30 08:43 UTCEchelonGraph re-scored
  50. 2026-09-30 08:43 UTCVendor advisory
  51. 2026-09-29 02:52 UTCEchelonGraph re-scored
  52. 2026-09-29 02:52 UTCVendor advisory
  53. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  54. 2026-09-28 04:53 UTCEchelonGraph re-scored
  55. 2026-09-28 04:53 UTCVendor advisory
  56. 2026-09-27 06:54 UTCEchelonGraph re-scored
  57. 2026-09-27 06:54 UTCVendor advisory
  58. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  59. 2026-09-25 03:56 UTCEchelonGraph re-scored
  60. 2026-09-25 03:56 UTCVendor advisory
  61. 2026-09-24 05:57 UTCEchelonGraph re-scored
  62. 2026-09-24 05:57 UTCVendor advisory
  63. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  64. 2026-09-23 07:58 UTCEchelonGraph re-scored▼ 0.60
  65. 2026-09-23 07:58 UTCVendor advisory
  66. 2026-09-22 19:51 UTCNVD updateCVSS v3 → 6.5 · severity → MEDIUM
  67. 2026-09-22 19:49 UTCEchelonGraph re-scored
  68. 2026-09-22 19:49 UTCVendor advisory
  69. 2026-09-22 06:08 UTCEchelonGraph re-scored
  70. 2026-09-22 06:08 UTCVendor advisory
  71. 2026-09-21 18:01 UTCVendor advisory
  72. 2026-09-21 05:52 UTCEchelonGraph re-scored
  73. 2026-09-21 05:52 UTCVendor advisory
  74. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  75. 2026-09-20 17:17 UTCVendor advisory

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-63652?
CVE-2026-63652 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, rdpsnd_server_recv_formats in channels/rdpsnd/server/rdpsnd_main.c frees context->client_formats on a malformed Client Audio Formats PDU without clearing the owning pointer or num_client_formats. An authenticated RDP…
When was the CVE record for CVE-2026-63652 published?
The CVE record for CVE-2026-63652 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 October 26, 2026; the record at its source may have been updated since.
Is CVE-2026-63652 actively exploited?
CVE-2026-63652 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63652?
CVE-2026-63652 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-63652?
A fix for CVE-2026-63652 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63652 are linked in the Vendor Advisories panel on this page.

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