CVE-2026-33987

MEDIUMNVD 6.66.6
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.6 under NVD CVSS v3. EPSS exploit probability: 0.1% (1st 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

Also known asEUVD-2026-17235 (ENISA EUVD)Source: ENISA EUVD

6.6EG
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: 0.1%CVSS: 6.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in persistent_cache_read_entry_v3() in libfreerdp/cache/persistent.c, persistent->bmpSize is updated before winpr_aligned_recalloc(). If realloc fails, bmpSize is inflated while bmpData points to the old buffer. This issue has been patched in version 3.24.2.

CVSS v3
6.6
EG Score
6.6MEDIUMmedium confidence
EG Risk
30
EG Risk 30/100

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)
Severity66% × 45%
Impact severity (EG Severity): CVSS 6.6 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 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
0.1%
EPSS %ILE
1st
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 (6.6): severity, escalated by confirmed exploitation. This CVE's 6.6 is its impact severity (EG Severity), not escalated.

EG Severity
6.6 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
0.1% within 30 daysSource: FIRST EPSS. 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 every mission impact level.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: the SSVC and BOD 26-04 blocks below.

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

March 30, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Aug 3, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

Persistent Cache bmpSize Desync - Heap OOB Write · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-ff8h-p5vc-wcwc
GitHub commit

commit 1a890eb43492 (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit 1a890eb43492 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/1a890eb43492b5eb707cb3dd6fc908f696e8fc1c

Vendor Advisories for CVE-2026-33987(3)

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

Patch Availability(4)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuwinpr3-utils (3.30.0+dfsg-0ubuntu0.26.04.1) @ resolute2026-10-23ubuntu
redhatfreerdp-2:3.10.3-3.el10_0.72026-05-26redhat
redhatfreerdp-2:3.10.3-12.el10_2.52026-05-19redhat
redhatfreerdp-2:3.10.3-5.el10_1.82026-05-11redhat

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp22.10.0+dfsg1-1 ... 2.9.0+dfsg1-1~bpo11+1 (32 versions)
  • every version on: no fix on record
—
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, 3.15.0+dfsg-2.1+deb13u1
  • every version up to 3.15.0+dfsg-2.1+deb13u2: fixed in 3.15.0+dfsg-2.1+deb13u2
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp33.15.0+dfsg-2.1 ... 3.24.2+dfsg-1~bpo13+1 (25 versions)
  • every version up to 3.24.2+dfsg-1: fixed in 3.24.2+dfsg-1
—

Weakness Classification(2)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 36× 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.

Showing the most recent 98 of 102 refreshes 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. 2 repeat rows among the latest 100 are merged into the row they repeat. The 4 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  2. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  4. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  5. 2026-10-25 14:34 UTCEG score recompute
  6. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-10-23 03:28 UTCEG score recompute
  9. 2026-10-23 03:28 UTCVendor advisory
  10. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-10-18 03:46 UTCEG score recompute
  16. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-10-12 16:13 UTCEG score recompute
  23. 2026-10-11 19:55 UTCEG score recompute
  24. 2026-10-11 17:08 UTCEG score recompute
  25. 2026-10-11 14:35 UTCEG score recompute
Show 73 more
  1. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  2. 2026-10-11 03:31 UTCOSV refresh
  3. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  4. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  5. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  6. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  10. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-09-21 15:19 UTCOSV refresh
  17. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  18. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  19. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  20. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  21. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  22. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  23. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  24. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  25. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  26. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  27. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  28. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  29. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  30. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  31. 2026-09-02 12:44 UTCOSV refresh
  32. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  33. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  34. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  35. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  36. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  37. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  38. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  39. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  40. 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  41. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  42. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  43. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  44. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  45. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  46. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  47. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  48. 2026-08-16 09:43 UTCEG score recompute
  49. 2026-08-16 09:43 UTCVendor advisory
  50. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  51. 2026-08-14 06:07 UTCEG score recompute
  52. 2026-08-14 06:07 UTCVendor advisory
  53. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  54. 2026-08-12 20:28 UTCVendor advisory
  55. 2026-08-11 08:51 UTCVendor advisory
  56. 2026-08-10 07:17 UTCVendor advisory
  57. 2026-08-09 05:42 UTCEG score recompute
  58. 2026-08-09 05:42 UTCVendor advisory
  59. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  60. 2026-08-07 15:50 UTCEG score recompute
  61. 2026-08-07 15:50 UTCVendor advisory
  62. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  63. 2026-08-06 00:39 UTCEG score recompute
  64. 2026-08-06 00:39 UTCVendor advisory
  65. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  66. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  67. 2026-08-03 22:59 UTCEG score recompute
  68. 2026-08-03 22:59 UTCVendor advisory
  69. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  70. 2026-08-02 15:01 UTCEG score recompute▼ 0.50
  71. 2026-08-02 15:01 UTCVendor advisory
  72. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  73. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.1% · 1st percentile

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Frequently asked(5)

What is CVE-2026-33987?
CVE-2026-33987 is a medium-severity vulnerability; its CVE record was published on March 30, 2026. FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in persistentcachereadentryv3() in libfreerdp/cache/persistent.c, persistent->bmpSize is updated before winpralignedrecalloc(). If realloc fails, bmpSize is inflated while bmpData points to the old buffer.…
When was the CVE record for CVE-2026-33987 published?
The CVE record for CVE-2026-33987 was published on March 30, 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 June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-33987 actively exploited?
CVE-2026-33987 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-33987?
CVE-2026-33987 has a CVSS v3 base score of 6.6 (NVD).
How do I remediate CVE-2026-33987?
A fix for CVE-2026-33987 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-33987 are linked in the Vendor Advisories panel on this page.

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