CVE-2021-42142: Contiki-NG Tinydtls

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

An issue was discovered in Contiki-NG tinyDTLS through master branch 53a0d97. DTLS servers mishandle the early use of a large epoch number. This vulnerability allows remote attackers to cause a denial of service and false-positive packet drops.

Affected products

• Contiki-NG Tinydtls: up to and including 2018-08-30

Published 2024-01-23. Last modified 2026-06-17.