CVE-2026-77234CWE-863broken-access-control

CVE-2026-77234

High · published August 21, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
6.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
9.3 · CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
EPSS
0.00170 · 6.1th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-08-21T22:16Z
Affected products (1)
ProductVersionsFixed in
amazon/freertos≥ 7.0.0, < 11.3.111.3.1
References (3)
https://aws.amazon.com/security/security-bulletins/2026-086-aws/ · ff89ba41-3aa1-4d27-914a-91399e9639e5https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1 · ff89ba41-3aa1-4d27-914a-91399e9639e5https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-w3vr-pr75-5hc6 · ff89ba41-3aa1-4d27-914a-91399e9639e5
EPSS history
Timeline
  • 21 AUG 17:40Z
    Improper input validation in FreeRTOS-Kernel timer command handling
    cvelistv5