CVE-2021-27433: Arm Mbed Ualloc

Critical severity, CVSS 9.8. EPSS: 1.8% chance of exploitation in the next 30 days.

ARM mbed-ualloc memory library version 1.3.0 is vulnerable to integer wrap-around in function mbed_krbs, which can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.

Affected products

• Arm Mbed Ualloc: version 1.3.0 only

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