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Authentication Bypass by Spoofing

CVE-2021-27853

Severity Medium
Score 4.7/10

Summary

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.

  • LOW
  • ADJACENT_NETWORK
  • LOW
  • CHANGED
  • NONE
  • NONE
  • NONE
  • NONE

CWE-290 - Authentication Bypass by Spoofing

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

References

Advisory Timeline

  • Published