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Improper Handling of Length Parameter Inconsistency

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-130 - Improper Handling of Length Parameter Inconsistency

The software parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.

References

Advisory Timeline

  • Published