CVE-2021-38387: Contiki-OS Contiki

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

In Contiki 3.0, a Telnet server that silently quits (before disconnection with clients) leads to connected clients entering an infinite loop and waiting forever, which may cause excessive CPU consumption.

Affected products

• Contiki-OS Contiki: version 3.0 only

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