What’s Vulnerable › Vulnerabilities

CVE-2021-31572

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-22 · updated 2026-06-17
• Weakness: CWE-190

Description

The kernel in Amazon Web Services FreeRTOS before 10.4.3 has an integer overflow in stream_buffer.c for a stream buffer.

Affected products

• FreeRTOS-Kernel: before 10.4.3 — fixed in 10.4.3

How to fix

Upgrade to a fixed version: FreeRTOS-Kernel 10.4.3. Check the vendor advisory for mitigations.

References

• https://github.com/FreeRTOS/FreeRTOS-Kernel/commit/d05b9c123f2bf9090bce386a244fc934ae44db5b
• https://github.com/FreeRTOS/FreeRTOS-Kernel/commit/d05b9c123f2bf9090bce386a244fc934ae44db5b

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