CVE-2026-77237

HIGHNVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.4 under NVD CVSS v3. EPSS exploit probability: 0.2% (6th percentile of EPSS-scored CVEs). 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, nvd
8.4EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.4Exploit: None knownExposed services: Not assessed

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

Missing queue-set type validation in xQueueAddToSet() in the FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports with configUSE_QUEUE_SETS=1 to read privileged kernel memory. To remediate this issue, users should upgrade to version 11.3.1 or later.

CVSS v3
8.4
EG Score
8.4HIGHmedium confidence
EG Risk
38
EG Risk 38/100CISA SSVC

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
Severity84% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 21, 2026

Last Modified

August 25, 2026

Advisory Details (2)

Auto-updated Aug 21, 2026
No fix on record yet.
generic

GitHub - FreeRTOS/FreeRTOS-Kernel at 11.3.1 · GitHub

https://github.com/FreeRTOS/FreeRTOS-Kernel/tree/11.3.1
generic

Issue with FreeRTOS-Kernel - CVE-2026-77234, CVE-2026-77235, CVE-2026-77236, CVE-2026-77237

https://aws.amazon.com/security/security-bulletins/2026-086-aws/

Vendor Advisories for CVE-2026-77237(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 48× 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. 2026-10-07 23:48 UTCEPSS rescore
  2. 2026-10-06 18:52 UTCEG score recompute
  3. 2026-10-06 15:18 UTCEPSS rescore
  4. 2026-10-06 07:49 UTCEG score recompute
  5. 2026-10-05 17:43 UTCEPSS rescore
  6. 2026-10-05 04:54 UTCEG score recompute
  7. 2026-10-04 23:22 UTCEPSS rescore
  8. 2026-10-03 17:39 UTCEG score recompute
  9. 2026-10-03 14:26 UTCEPSS rescore
  10. 2026-10-02 19:32 UTCEG score recompute
  11. 2026-10-01 21:24 UTCEG score recompute
  12. 2026-10-01 19:50 UTCEPSS rescore
  13. 2026-09-30 20:28 UTCEG score recompute
  14. 2026-09-29 16:11 UTCEG score recompute
  15. 2026-09-29 15:24 UTCEPSS rescore
  16. 2026-09-29 00:08 UTCEG score recompute
  17. 2026-09-28 13:52 UTCEPSS rescore
  18. 2026-09-27 14:40 UTCEG score recompute
  19. 2026-09-27 13:48 UTCEPSS rescore
  20. 2026-09-27 02:28 UTCEG score recompute
  21. 2026-09-26 15:59 UTCEPSS rescore
  22. 2026-09-26 00:28 UTCEPSS rescore
  23. 2026-09-24 16:22 UTCEG score recompute
  24. 2026-09-24 14:04 UTCEPSS rescore
  25. 2026-09-23 18:14 UTCEG score recompute
Show 61 more
  1. 2026-09-23 17:54 UTCEPSS rescore
  2. 2026-09-22 19:43 UTCEG score recompute
  3. 2026-09-22 16:01 UTCEPSS rescore
  4. 2026-09-22 05:54 UTCEG score recompute
  5. 2026-09-21 21:09 UTCEPSS rescore
  6. 2026-09-21 07:46 UTCEG score recompute
  7. 2026-09-20 20:16 UTCEPSS rescore
  8. 2026-09-19 20:05 UTCEG score recompute
  9. 2026-09-18 21:37 UTCEG score recompute
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-17 22:00 UTCEG score recompute
  12. 2026-09-16 23:52 UTCEG score recompute
  13. 2026-09-16 14:08 UTCEPSS rescore
  14. 2026-09-15 03:33 UTCEG score recompute
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-13 18:20 UTCEG score recompute
  17. 2026-09-12 20:13 UTCEG score recompute
  18. 2026-09-12 15:02 UTCEPSS rescore
  19. 2026-09-11 11:01 UTCEG score recompute
  20. 2026-09-10 12:12 UTCEG score recompute
  21. 2026-09-10 09:35 UTCEPSS rescore
  22. 2026-09-09 01:46 UTCEG score recompute
  23. 2026-09-08 22:01 UTCEPSS rescore
  24. 2026-09-07 19:13 UTCEG score recompute
  25. 2026-09-06 20:27 UTCEG score recompute
  26. 2026-09-06 13:48 UTCEPSS rescore
  27. 2026-09-05 00:09 UTCEG score recompute
  28. 2026-09-04 13:06 UTCEG score recompute
  29. 2026-09-04 05:07 UTCEPSS rescore
  30. 2026-09-02 16:14 UTCEG score recompute
  31. 2026-09-02 14:12 UTCEPSS rescore
  32. 2026-09-01 18:06 UTCEG score recompute
  33. 2026-09-01 13:54 UTCEPSS rescore
  34. 2026-09-01 07:01 UTCEG score recompute
  35. 2026-09-01 04:40 UTCEPSS rescore
  36. 2026-09-01 04:40 UTCEPSS rescore
  37. 2026-08-30 21:46 UTCEG score recompute
  38. 2026-08-30 19:18 UTCEPSS rescore
  39. 2026-08-30 19:17 UTCEPSS rescore
  40. 2026-08-30 10:43 UTCEG score recompute
  41. 2026-08-30 01:22 UTCEPSS rescore
  42. 2026-08-29 01:07 UTCEG score recompute
  43. 2026-08-28 21:42 UTCEPSS rescore
  44. 2026-08-28 00:21 UTCEG score recompute
  45. 2026-08-27 14:25 UTCEPSS rescore
  46. 2026-08-26 15:07 UTCEG score recompute
  47. 2026-08-26 14:47 UTCEPSS rescore
  48. 2026-08-25 16:54 UTCEG score recompute▲ 1.90
  49. 2026-08-25 16:53 UTCNVD updateCVSS v3 → 8.4 · severity → HIGH
  50. 2026-08-25 16:36 UTCEG score recompute
  51. 2026-08-25 13:49 UTCEPSS rescore
  52. 2026-08-24 16:48 UTCEG score recompute
  53. 2026-08-24 14:18 UTCEPSS rescore
  54. 2026-08-23 21:00 UTCEG score recompute
  55. 2026-08-23 00:19 UTCEPSS rescore
  56. 2026-08-21 21:24 UTCEG score recompute
  57. 2026-08-21 20:19 UTCEG score recompute
  58. 2026-08-21 19:55 UTCEG score recompute
  59. 2026-08-21 18:18 UTCEG score recompute
  60. 2026-08-21 18:04 UTCEG score recompute
  61. 2026-08-21 18:04 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77237?
CVE-2026-77237 is a high vulnerability published on August 21, 2026. Missing queue-set type validation in xQueueAddToSet() in the FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports with configUSEQUEUESETS=1 to read privileged kernel memory. To remediate this issue, users should upgrade to version 11.3.1 or later.
When was CVE-2026-77237 disclosed?
CVE-2026-77237 was first published on August 21, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77237 actively exploited?
CVE-2026-77237 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77237?
CVE-2026-77237 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2026-77237?
No fix for CVE-2026-77237 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-77237 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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