CVE-2021-27425: Cesanta Mongoose OS

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

Cesanta Software Mongoose-OS v2.17.0 is vulnerable to integer wrap-around in function mm_malloc. This improper memory assignment can lead to arbitrary memory allocation, resulting in unexpected behavior such as a crash or a remote code injection/execution.

Affected products

• Cesanta Mongoose OS: version 2.17.0 only

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