medium4.7
CVE-2021-27861
Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length (and optionally VLAN0 headers)
Impact
Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length (and optionally VLAN0 headers)
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Ieee | Ieee 802.2 | through 802.2h-1997 |
| Ietf | P802.1q | through d1.0 |
Weakness classification
References
- NVD record
- CVE.org record
- https://blog.champtar.fr/VLAN0_LLC_SNAP/
- https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/
- https://kb.cert.org/vuls/id/855201
- https://standards.ieee.org/ieee/802.1Q/10323/
- https://standards.ieee.org/ieee/802.2/1048/
- https://blog.champtar.fr/VLAN0_LLC_SNAP/
- https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/
- https://kb.cert.org/vuls/id/855201
- https://standards.ieee.org/ieee/802.1Q/10323/
- https://standards.ieee.org/ieee/802.2/1048/
- https://www.kb.cert.org/vuls/id/855201