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TI-2021-19749 Aliases CVE-2021-43997GHSA-cp2g-q9qc-pm45

FreeRTOS versions 10.2.0 through 10.4.5 do not prevent non-kernel code from calling the…

Priority LOW 34Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

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.

Why it matters now

EPSS 0.00339 27th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:amazon:freertos:*:*:*:*:-:*:*:*10.2.0 to before 10.4.6VulnerableAWS
cpe:2.3:o:amazon:freertos:10.4.3:patch1:*:*:lts:*:*:*10.4.3 patch1VulnerableAWS
  • cpe:2.3:o:amazon:freertos:*:*:*:*:-:*:*:* Versions 10.2.0 to before 10.4.6 Vulnerable ·AWS
  • cpe:2.3:o:amazon:freertos:10.4.3:patch1:*:*:lts:*:*:* Versions 10.4.3 patch1 Vulnerable ·AWS

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-43997
  2. 2026-10-03 Alias added: GHSA-cp2g-q9qc-pm45

References

Advisory 2

Other 2

  • TI-2021-11999 The kernel in Amazon Web Services FreeRTOS before 10.4.3 has insufficient bounds checking… CVSS 3.1CRITICAL 9.8
  • TI-2021-11681 The kernel in Amazon Web Services FreeRTOS before 10.4.3 has an integer overflow in stream_buffer.c for a stream buffer. CVSS 3.1CRITICAL 9.8
  • TI-2021-11680 The kernel in Amazon Web Services FreeRTOS before 10.4.3 has an integer overflow in queue.c for queue creation. CVSS 3.1CRITICAL 9.8
  • TI-2018-11856 Amazon Web Services (AWS) FreeRTOS through 1.3.1, FreeRTOS up to V10.0.1 (with… CVSS 3.0HIGH 8.1
  • TI-2018-11855 Amazon Web Services (AWS) FreeRTOS through 1.3.1, FreeRTOS up to V10.0.1 (with… CVSS 3.0HIGH 8.1
  • TI-2018-11896 An issue was discovered in Amazon Web Services (AWS) FreeRTOS through 1.3.1, FreeRTOS up… CVSS 3.0HIGH 8.1
See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences