CVE-2021-27854

Description

Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using combinations of VLAN 0 headers, LLC/SNAP headers, and converting frames from Ethernet to Wifi and its reverse.

References

https://www.kb.cert.org/vuls/id/855201

https://standards.ieee.org/ieee/802.2/1048/

https://standards.ieee.org/ieee/802.1Q/10323/

https://kb.cert.org/vuls/id/855201

https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/

https://blog.champtar.fr/VLAN0_LLC_SNAP/

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

EPSS