CVE-2021-43997: High severity amazon freertos vulnerability
FreeRTOS versions 10.2.0 through 10.4.5 do not prevent non-kernel code from calling the xPortRaisePrivilege internal function to raise privilege. FreeRTOS versions through 10.4.6 do not prevent a third party that has already independently gained the ability to execute injected code to achieve further privilege escalation by branching directly inside a FreeRTOS MPU API wrapper function with a manually crafted stack frame. These issues affect ARMv7-M MPU ports, and ARMv8-M ports with MPU support enabled (i.e. configENABLEMPU set to 1). These are fixed in V10.5.0 and in V10.4.3-LTS Patch 3.
Affected Software
Event History
Frequently Asked Questions
What is CVE-2021-43997?
CVE-2021-43997 is a vulnerability in FreeRTOS versions 10.2.0 through 10.4.5 that allows non-kernel code to call a privileged internal function.
How severe is CVE-2021-43997?
CVE-2021-43997 has a severity rating of 7.8 (high).
Which software versions are affected by CVE-2021-43997?
FreeRTOS versions 10.2.0 through 10.4.5 are affected by CVE-2021-43997.
How can a third party exploit CVE-2021-43997?
A third party that has already gained the ability to execute injected code can exploit CVE-2021-43997 to achieve further privilege escalation.
Where can I find more information about CVE-2021-43997?
You can find more information about CVE-2021-43997 in the FreeRTOS GitHub releases page: [Link](https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.3-LTS-Patch-2)