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)

Vulnerability/
CVE-2021-43997

high

7.8

17/11/2021

21/11/2024

CVE-2021-43997

First published: Wed Nov 17 2021(Updated: )

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. configENABLE_MPU set to 1). These are fixed in V10.5.0 and in V10.4.3-LTS Patch 3.

Credit: cve@mitre.org cve@mitre.org

Affected Software	Affected Version	How to fix
Amazon Freertos	>=10.2.0<10.4.6
Amazon Freertos	=10.4.3-patch1
	>=10.2.0<10.4.6
	=10.4.3-patch1

Never miss a vulnerability like this again

Reference Links

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)

collector/nvd-index
agent/references
agent/type
collector/mitre-cve
source/MITRE
agent/severity
agent/description
agent/first-publish-date
collector/nvd-api
source/NVD
agent/software-canonical-lookup
agent/last-modified-date
agent/author
agent/softwarecombine
agent/tags
agent/event
vendor/amazon
canonical/amazon freertos
version/amazon freertos/10.2.0
version/amazon freertos/10.4.3-patch1

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.