CVE-2026-77237

HIGHNVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.4 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 97% 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, nvd
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.4Exploit: None knownExposed: 0

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

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
8.4(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity84% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

August 21, 2026

Last Modified

August 25, 2026

Advisory Details (2)

Auto-updated Aug 21, 2026
No patch confirmed 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 10× in last 7d / 53× 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. 2026-09-18 21:37 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 22:00 UTCEG score recompute
  4. 2026-09-16 23:52 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-15 03:33 UTCEG score recompute
  7. 2026-09-15 03:12 UTCEPSS rescore
  8. 2026-09-13 18:20 UTCEG score recompute
  9. 2026-09-12 20:13 UTCEG score recompute
  10. 2026-09-12 15:02 UTCEPSS rescore
  11. 2026-09-11 11:01 UTCEG score recompute
  12. 2026-09-10 12:12 UTCEG score recompute
  13. 2026-09-10 09:35 UTCEPSS rescore
  14. 2026-09-09 01:46 UTCEG score recompute
  15. 2026-09-08 22:01 UTCEPSS rescore
  16. 2026-09-07 19:13 UTCEG score recompute
  17. 2026-09-06 20:27 UTCEG score recompute
  18. 2026-09-06 13:48 UTCEPSS rescore
  19. 2026-09-05 00:09 UTCEG score recompute
  20. 2026-09-04 13:06 UTCEG score recompute
  21. 2026-09-04 05:07 UTCEPSS rescore
  22. 2026-09-02 16:14 UTCEG score recompute
  23. 2026-09-02 14:12 UTCEPSS rescore
  24. 2026-09-01 18:06 UTCEG score recompute
  25. 2026-09-01 13:54 UTCEPSS rescore
Show 28 more
  1. 2026-09-01 07:01 UTCEG score recompute
  2. 2026-09-01 04:40 UTCEPSS rescore
  3. 2026-09-01 04:40 UTCEPSS rescore
  4. 2026-08-30 21:46 UTCEG score recompute
  5. 2026-08-30 19:18 UTCEPSS rescore
  6. 2026-08-30 19:17 UTCEPSS rescore
  7. 2026-08-30 10:43 UTCEG score recompute
  8. 2026-08-30 01:22 UTCEPSS rescore
  9. 2026-08-29 01:07 UTCEG score recompute
  10. 2026-08-28 21:42 UTCEPSS rescore
  11. 2026-08-28 00:21 UTCEG score recompute
  12. 2026-08-27 14:25 UTCEPSS rescore
  13. 2026-08-26 15:07 UTCEG score recompute
  14. 2026-08-26 14:47 UTCEPSS rescore
  15. 2026-08-25 16:54 UTCEG score recompute▲ 1.90
  16. 2026-08-25 16:53 UTCNVD updateCVSS v3 → 8.4 · severity → HIGH
  17. 2026-08-25 16:36 UTCEG score recompute
  18. 2026-08-25 13:49 UTCEPSS rescore
  19. 2026-08-24 16:48 UTCEG score recompute
  20. 2026-08-24 14:18 UTCEPSS rescore
  21. 2026-08-23 21:00 UTCEG score recompute
  22. 2026-08-23 00:19 UTCEPSS rescore
  23. 2026-08-21 21:24 UTCEG score recompute
  24. 2026-08-21 20:19 UTCEG score recompute
  25. 2026-08-21 19:55 UTCEG score recompute
  26. 2026-08-21 18:18 UTCEG score recompute
  27. 2026-08-21 18:04 UTCEG score recompute
  28. 2026-08-21 18:04 UTCMITRE cvelistV5first tracked

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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 96.8% of all 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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77237, 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

Explore the affected products and dependency analysis for CVE-2026-77237

Explore →

Is Your Infrastructure Affected by CVE-2026-77237?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs