CVE-2021-27861

—

CVSS 3.1

4.7 medium

EPSS

<1%p47

Published

Sep 27, 2022 (Sep 27, 2022)

Modified

Jun 17, 2026

Description

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

Vendors: ieee ietf
Products: ieee 802.2, p802.1q
Weakness: CWE-130, CWE-290
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.6%)

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