system
Provide references for <CVE-2021-21257>.
user
Where can I find more information about <CVE-2021-21257>?
assistant
References are available at: https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-mvc7-9p4q-c5cm, https://github.com/contiki-ng/contiki-ng/pull/1431.