CVE Vulnerabilities

CVE-2021-27854

Authentication Bypass by Spoofing

Published: Sep 27, 2022 | Modified: Oct 12, 2022
CVSS 3.x
4.7
MEDIUM
Source:
NVD
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
CVSS 2.x
RedHat/V2
RedHat/V3
5.3 MODERATE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Ubuntu

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.

Weakness

This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

Affected Software

Name Vendor Start Version End Version
Ieee_802.2 Ieee * 802.2h-1997 (including)

References