Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2021-27853

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
27/09/2022
Last modified:
04/11/2025

Description

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.

Impact

Vector 3.x
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N CVSS v3.1 Severity and Metrics:

Base Score: 4.70 MEDIUM
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): None
Integrity (I): Low
Availability (A): None

Base Score 3.x
4.70
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:ieee:ieee_802.2:*:*:*:*:*:*:*:* 802.2h-1997 (including)
cpe:2.3:a:ietf:p802.1q:*:*:*:*:*:*:*:* d1.0 (including)
cpe:2.3:o:cisco:catalyst_6503-e_firmware:15.5\(01.01.85\)sy07:*:*:*:*:*:*:*
cpe:2.3:h:cisco:catalyst_6503-e:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:catalyst_6504-e_firmware:15.5\(01.01.85\)sy07:*:*:*:*:*:*:*
cpe:2.3:h:cisco:catalyst_6504-e:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:catalyst_6506-e_firmware:15.5\(01.01.85\)sy07:*:*:*:*:*:*:*
cpe:2.3:h:cisco:catalyst_6506-e:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:catalyst_6509-e_firmware:15.5\(01.01.85\)sy07:*:*:*:*:*:*:*
cpe:2.3:h:cisco:catalyst_6509-e:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:catalyst_6509-neb-a_firmware:15.5\(01.01.85\)sy07:*:*:*:*:*:*:*
cpe:2.3:h:cisco:catalyst_6509-neb-a:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:catalyst_6509-v-e_firmware:15.5\(01.01.85\)sy07:*:*:*:*:*:*:*
cpe:2.3:h:cisco:catalyst_6509-v-e:-:*:*:*:*:*:*:*
cpe:2.3:o:cisco:catalyst_6513-e_firmware:15.5\(01.01.85\)sy07:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools