CVE Vulnerabilities

CVE-2021-27861

Improper Handling of Length Parameter Inconsistency

Published: Sep 27, 2022 | Modified: Nov 21, 2024
CVSS 3.x
4.7
MEDIUM
Source:
NVD
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
CVSS 2.x
RedHat/V2
RedHat/V3
5.3 MODERATE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Ubuntu

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

Weakness

The product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.

Affected Software

Name Vendor Start Version End Version
Ieee_802.2 Ieee * 802.2h-1997 (including)

Potential Mitigations

References