CVE-2021-27427: Riot-OS Riot

Critical severity, CVSS 9.8. EPSS: 1.7% chance of exploitation in the next 30 days.

RIOT OS version 2020.01.1 is vulnerable to integer wrap-around in its implementation of calloc function, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.

Affected products

• Riot-OS Riot: version 2020.01.1 only

Published 2022-05-03. Last modified 2026-06-17.