CVE-2020-24336: Contiki-NG

Critical severity, CVSS 9.8. EPSS: 59.1% chance of exploitation in the next 30 days.

An issue was discovered in Contiki through 3.0 and Contiki-NG through 4.5. The code for parsing Type A domain name answers in ip64-dns64.c doesn't verify whether the address in the answer's length is sane. Therefore, when copying an address of an arbitrary length, a buffer overflow can occur. This bug can be exploited whenever NAT64 is enabled.

Affected products

• Contiki-NG Contiki-NG: up to and including 4.5
• Contiki-OS Contiki: up to and including 3.0

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