CVE-2021-27853 | BDVDB-2026-185545 Detail
IEEE802.2
Description#
Layer 2 network filtering capabilities such as IPv6 RA guard or ARP inspection can be bypassed using combinations of VLAN 0 headers and LLC/SNAP headers.
Impact#
Per CVSS v3.1: confidentiality impact none, integrity impact low, availability impact none. Attack vector: adjacent.
Weaknesses#
- CWE-290 Authentication Bypass by Spoofing
References#
- 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://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-VU855201-J3z8CKTX
- https://kb.cert.org/vuls/id/855201
- https://blog.champtar.fr/VLAN0_LLC_SNAP/
- https://www.kb.cert.org/vuls/id/855201
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.