Provide references for CVE-2021-27861.
Where can I find more information about CVE-2021-27861?
References are available at: https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/, https://standards.ieee.org/ieee/802.2/1048/, https://standards.ieee.org/ieee/802.1Q/10323/, https://kb.cert.org/vuls/id/855201, https://blog.champtar.fr/VLAN0_LLC_SNAP/.