CVE-2020-27634: Contiki-NG

Critical severity, CVSS 9.1. EPSS: 1.7% chance of exploitation in the next 30 days.

In Contiki 4.5, TCP ISNs are improperly random.

Affected products

• Contiki-NG Contiki-NG: version 4.5 only

Published 2023-10-10. Last modified 2026-06-17.