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CVE-2021-27862

L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with an invalid length during Ethernet to Wifi frame translation

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).

CVSS 3.1 · 4.7 Medium EPSS < 1% KEV · Not listed
Vendors
Ieee Ietf
Products
Ieee 802.2 P802.1q
CVE-2021-27861

L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with invalid lengths

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

CVSS 3.1 · 4.7 Medium EPSS < 1% KEV · Not listed
Vendors
Ieee Ietf
Products
Ieee 802.2 P802.1q
CVE-2021-27854

L2 network filtering bypass using stacked VLAN0, LLC/SNAP headers, and Ethernet to Wifi frame translation

Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using combinations of VLAN 0 headers, LLC/SNAP headers, and converting frames from Ethernet to Wifi and its reverse.

CVSS 3.1 · 4.7 Medium EPSS < 1% KEV · Not listed
Vendors
Ieee Ietf
Products
Ieee 802.2 P802.1q