Bypassing Layer 2 Network Filtering with Invalid LLC/SNAP Headers and Ethernet to WiFi Frame Conversion

CVE-2021-27862 · MEDIUM Severity

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length and Ethernet to Wifi frame conversion (and optionally VLAN0 headers).

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