CVE-2021-27853
4.7
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| IEEE | 802.2 | 802.2h-1997 <= 802.2h-1997 | affected |
| IETF | draft-ietf-v6ops-ra-guard | 08 <= 08 | affected |
| IETF | P802.1Q | D1.0 <= D1.0 | affected |
Weaknesses
- CWE-290: CWE-290: Authentication Bypass by Spoofing
ADP Enrichment
CVE Program Container
Additional 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
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
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/
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