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TI-2021-11999 Aliases CVE-2021-32020GHSA-8pwj-qgrj-p95h

The kernel in Amazon Web Services FreeRTOS before 10.4.3 has insufficient bounds checking…

Priority MEDIUM 45CWE-119Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

The kernel in Amazon Web Services FreeRTOS before 10.4.3 has insufficient bounds checking during management of heap memory.

Why it matters now

EPSS 0.01303 70th 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 · 1

CPEVersionsRoleVendor
cpe:2.3:o:amazon:freertos:*:*:*:*:*:*:*:*before 10.4.3VulnerableAWS
  • cpe:2.3:o:amazon:freertos:*:*:*:*:*:*:*:* Versions before 10.4.3 Vulnerable ·AWS

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-32020
  2. 2026-10-03 Alias added: GHSA-8pwj-qgrj-p95h

References

Patch 1

  • 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
  • TI-2026-53921 Improper input validation in FreeRTOS-Kernel timer command handling CVSS 4.0CRITICAL 9.3
See all 20 →

Sources

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