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

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CVE-2021-35033

Severity CVSS v4.0:
Pending analysis
Type:
CWE-287 Authentication Issues
Publication date:
23/11/2021
Last modified:
27/10/2022

Description

A vulnerability in specific versions of Zyxel NBG6818, NBG7815, WSQ20, WSQ50, WSQ60, and WSR30 firmware with pre-configured password management could allow an attacker to obtain root access of the device, if the local attacker dismantles the device and uses a USB-to-UART cable to connect the device, or if the remote assistance feature had been enabled by an authenticated user.

Impact

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

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

Base Score 3.x
7.80
Severity 3.x
HIGH
Vector 2.0
AV:L/AC:M/Au:N/C:C/I:C/A:C CVSS v2.0 Severity and Metrics:

Base Score: 6.90 MEDIUM
Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C

Attack Vector (AV): Local
Attack Complexity (AC): Medium
Authentication (Au): None
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete

Base Score 2.0
6.90
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:zyxel:nbg6818_firmware:*:*:*:*:*:*:*:* 1.00\(absc.5\)c0 (excluding)
cpe:2.3:h:zyxel:nbg6818:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:nbg7815_firmware:*:*:*:*:*:*:*:* 1.00\(absk.7\)c0 (excluding)
cpe:2.3:h:zyxel:nbg7815:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:wsq20_firmware:*:*:*:*:*:*:*:* 1.00\(abof.11\)c0 (excluding)
cpe:2.3:h:zyxel:wsq20:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:wsq50_firmware:*:*:*:*:*:*:*:* 2.20\(abkj.7\)c0 (excluding)
cpe:2.3:h:zyxel:wsq50:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:wsq60_firmware:*:*:*:*:*:*:*:* 2.20\(abnd.8\)c0 (excluding)
cpe:2.3:h:zyxel:wsq60:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:wsr30_firmware:*:*:*:*:*:*:*:* 1.00\(abmy.12\)c0 (excluding)
cpe:2.3:h:zyxel:wsr30:-:*:*:*:*:*:*:*

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


References to Advisories, Solutions, and Tools