How severe is CVE-2026-77237?

CVE-2026-77237 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-77237 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-77237?

CVE-2026-77237 affects Amazon Freertos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-77237?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-77237 published?

CVE-2026-77237 was published on 2026-08-21 and last updated on 2026-08-25.

CVE-2026-77237

CVE-2026-77237 is a medium-severity vulnerability in Amazon Freertos with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 8.2
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Amazon Freertos
Published: 2026-08-21
Last modified: 2026-08-25

Description

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.

Frequently asked questions

What is CVE-2026-77237?: 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.
How severe is CVE-2026-77237?: CVE-2026-77237 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-77237 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-77237?: CVE-2026-77237 affects Amazon Freertos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-77237?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-77237 published?: CVE-2026-77237 was published on 2026-08-21 and last updated on 2026-08-25.

References

Affected products (1)

cpe:2.3:o:amazon:freertos:*:*:*:*:*:*:*:*

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