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Authentication Bypass by Spoofing

CVE-2021-27861

Medium
4.7/10

Summary

Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length (and optionally VLAN0 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