CVE-2021-43997

highpriority · track · 31EPSS 0.003 · 27 %ileDEEUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.34% (27th) EPSS
CVSS 7.2 · high
Is it mine?
18 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · nvd · sick_psirt

EPSS · scored 2026-10-28

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.

01

cvss

Technical severity, 0–10. One row per scoring source.

7.8
010

base score 0–10 · higher = more severe · hover a vector to decode

v2.07.2highAV:L/AC:L/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 3.9 · impact 10
v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 5.9
v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · SICK PSIRT DE
v3.17.1highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
02

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-269US
03

affected products (18)

Products and version ranges known to be affected.

04

advisories (2)

Vendor and ecosystem advisories describing this.

  • SCA-2024-0004Third party vulnerabilities in SICK CDE-1002024-11-07csaf · sick_psirtDE

    The SICK CDE-100 uses the open-source libraries FreeRTOS, lwIP and MCU Boot. The used libraries contain vulnerabilities that affect the SICK CDE-100.

  • SCA-2025-0003FreeRTOS Vulnerabilities have no impact on SICK Products2025-02-28csaf · sick_psirtDE

    FreeRTOS has several known vulnerabilities and is used in various SICK products. A current analysis confirms that the identified vulnerabilities in FreeRTOS do not affect the mentioned SICK products. At this time, there is no indication of any potential risks to these SICK products.

05

also known as (3)

Other names and identifiers for this entity.

06

sources

Which sources assert this record, and when.

cnnvdenisa_euvdnvdsick_psirtNVDCVE.orgMITRE
published 2021-11-17modified 2026-06-17
07

references (13)

External citations — patches, advisories, analysis.

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