Vulnerability Details : CVE-2021-43997
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.
Vulnerability category: Gain privilege
Products affected by CVE-2021-43997
- cpe:2.3:o:amazon:freertos:*:*:*:*:-:*:*:*
- cpe:2.3:o:amazon:freertos:10.4.3:patch1:*:*:lts:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-43997
0.28%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 51 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-43997
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.2
|
HIGH | AV:L/AC:L/Au:N/C:C/I:C/A:C |
3.9
|
10.0
|
NIST | |
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
References for CVE-2021-43997
-
https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.3-LTS-Patch-3
Release V10.4.3 LTS Patch 3 · FreeRTOS/FreeRTOS-Kernel · GitHub
-
https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.3-LTS-Patch-2
Release V10.4.3 LTS Patch 2 · FreeRTOS/FreeRTOS-Kernel · GitHubRelease Notes;Third Party Advisory
-
https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.5.0
Release V10.5.0 · FreeRTOS/FreeRTOS-Kernel · GitHub
-
https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V10.4.6
Release V10.4.6 · FreeRTOS/FreeRTOS-Kernel · GitHubRelease Notes;Third Party Advisory
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