Improper Handling of Length Parameter Inconsistency
CVE-2021-27861
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