VULNERABILITY INTELLIGENCE

CVE-2021-27854

CVSS score4.7 MEDIUM
EPSS probability0.71%
CISA KEVNot currently listed
Published2022-09-27
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Description

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 classification

  • cret@cert.org: CWE-290
  • nvd@nist.gov: CWE-290

Primary references