CVE-2021-27854

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.

Severity	MEDIUM
CVSS	4.7
CWE	CWE-290
KEV
Published	3 years ago
Modified	6 months ago

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Cisco Small Business Smart and Managed Switches	cisco-sa-VU855201-J3z8CKTX
Cisco NX-OS Software	cisco-sa-VU855201-J3z8CKTX
Cisco IOS XR Software	cisco-sa-VU855201-J3z8CKTX
Cisco IOS XE Software	cisco-sa-VU855201-J3z8CKTX
Cisco IOS	cisco-sa-VU855201-J3z8CKTX
Cisco Aironet Access Point Software	cisco-sa-VU855201-J3z8CKTX
Cisco Catalyst 9600 Series Switches	cisco-sa-VU855201-J3z8CKTX
Cisco Catalyst 9500 Series Switches	cisco-sa-VU855201-J3z8CKTX
Cisco Catalyst 9400 Series Switches	cisco-sa-VU855201-J3z8CKTX
Cisco Catalyst 9300 Series Switches	cisco-sa-VU855201-J3z8CKTX
Cisco Catalyst 9200 Series Switches	cisco-sa-VU855201-J3z8CKTX