CVE-2021-27853CWE-290

L2 network filtering can be bypassed using stacked VLAN0 and LLC/SNAP headers

Medium · published September 27, 2022

CVSS v3.1
4.7
EPSS
1%
Percentile
56.6
In the wild
Unconfirmed
What it is

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.

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
0.00813 · 56.6th percentile
Weakness
CWE-290 · Authentication Bypass by Spoofing
Published
2022-09-27T17:55Z
EPSS history
Timeline
  • 27 SEP 17:55Z
    L2 network filtering can be bypassed using stacked VLAN0 and LLC/SNAP headers
    cvelistv5