CVE-2021-38386: Contiki-OS Contiki

High severity, CVSS 7.5. EPSS: 1.3% chance of exploitation in the next 30 days.

In Contiki 3.0, a buffer overflow in the Telnet service allows remote attackers to cause a denial of service because the ls command is mishandled when a directory has many files with long names.

Affected products

• Contiki-OS Contiki: version 3.0 only

Published 2021-08-10. Last modified 2026-06-17.