CVE-2021-27854CWE-290

L2 network filtering bypass using stacked VLAN0, LLC/SNAP headers, and Ethernet to Wifi frame translation

Medium · published September 27, 2022

CVSS v3.1
4.7
EPSS
1%
Percentile
53.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.7 · MEDIUM
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00714 · 53.2th percentile
Weakness
CWE-290 · Authentication Bypass by Spoofing
Published
2022-09-27T18:40Z
EPSS history
Timeline
  • 27 SEP 18:40Z
    L2 network filtering bypass using stacked VLAN0, LLC/SNAP headers, and Ethernet to Wifi frame translation
    cvelistv5