CVE Vulnerability

CVE-2021-27853

Layer 2 network filtering capabilities such as IPv6 RA guard or ARP inspection can be bypassed using combinations of VLAN 0 headers and LLC/SNAP headers.

4.7 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References
Link Resource
https://standards.ieee.org/ieee/802.2/1048/ Vendor Advisory
https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/ Technical Description Third Party Advisory
https://standards.ieee.org/ieee/802.1Q/10323/ Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-VU855201-J3z8CKTX Third Party Advisory
https://kb.cert.org/vuls/id/855201 Third Party Advisory US Government Resource
https://blog.champtar.fr/VLAN0_LLC_SNAP/ Exploit Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:ieee:ieee_802.2:*:*:*:*:*:*:*:*
cpe:2.3:a:ietf:p802.1q:*:*:*:*:*:*:*:*
Information

Published : 2022-09-27 06:15

Updated : 2022-11-16 05:26

NVD link : CVE-2021-27853

Mitre link : CVE-2021-27853

Products Affected

Cisco

Sf500-48mp Firmware

CWE
CWE-290

Authentication Bypass by Spoofing