CVE-2021-21282: Contiki-NG

Critical severity, CVSS 9.8. EPSS: 1% chance of exploitation in the next 30 days.

Contiki-NG is an open-source, cross-platform operating system for internet of things devices. In versions prior to 4.5, buffer overflow can be triggered by an input packet when using either of Contiki-NG's two RPL implementations in source-routing mode. The problem has been patched in Contiki-NG 4.5. Users can apply the patch for this vulnerability out-of-band as a workaround.

Affected products

• Contiki-NG Contiki-NG: before 4.5 (fixed in 4.5)

Published 2021-06-18. Last modified 2026-06-17.