Vulnerability in Ieee 802.2
CVE-2021-27854
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.
EPSS: 0.007 (48.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.
Affected products
- Ieee 802.2 — versions 802.2h-1997
- Ieee Ieee_802.2
- Ietf Draft-ietf-v6ops-ra-guard — versions 08
- Ietf P802.1q — versions D1.0
Weakness classification (CWE)
References
- cret@cert.org (Vendor Advisory)
- cret@cert.org (Vendor Advisory)
- cret@cert.org (Vendor Advisory)
- cret@cert.org
- cret@cert.org
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2021-27854?
- CVE-2021-27854 is a medium-severity vulnerability in Ieee 802.2, classified under Authentication Bypass by Spoofing. CVSS score: 4.7/10. Published 2022-09-27.
- How severe is CVE-2021-27854?
- Medium severity. CVSS v3 base score is 4.7 out of 10.