CVE-2020-25111: Contiki-OS

Critical severity, CVSS 9.8. EPSS: 20.9% chance of exploitation in the next 30 days.

An issue was discovered in the IPv6 stack in Contiki through 3.0. There is an insufficient check for the IPv6 header length. This leads to Denial-of-Service and potential Remote Code Execution via a crafted ICMPv6 echo packet.

Affected products

• Contiki-OS Contiki-OS: up to and including 3.0

Published 2020-12-11. Last modified 2026-06-17.