How severe is CVE-2026-77234?

CVE-2026-77234 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-77234 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-2026-77234?

CVE-2026-77234 affects Amazon Freertos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-77234?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-77234 published?

CVE-2026-77234 was published on 2026-08-21 and last updated on 2026-08-27.

CVE-2026-77234

CVE-2026-77234 is a high-severity vulnerability in Amazon Freertos with a CVSS 3.x base score of 8.8. 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-863.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 9.3
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Amazon Freertos
Published: 2026-08-21
Last modified: 2026-08-27

Description

Improper input validation in FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports to execute code in privileged kernel context. To remediate this issue, users should upgrade to version 11.3.1 or later.

Frequently asked questions

What is CVE-2026-77234?: Improper input validation in FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports to execute code in privileged kernel context. To remediate this issue, users should upgrade to version 11.3.1 or later.
How severe is CVE-2026-77234?: CVE-2026-77234 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-77234 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-2026-77234?: CVE-2026-77234 affects Amazon Freertos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-77234?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-77234 published?: CVE-2026-77234 was published on 2026-08-21 and last updated on 2026-08-27.

References

Affected products (1)

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

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