PT-2021-6620 · Zyxel · Zyxel Armor Z1/Z2

Published 2021-11-29 · Updated 2022-03-02 · CVE-2021-4029

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Zyxel ARMOR Z1/Z2 firmware (affected versions not specified)

Description A command injection issue in the CGI program of the firmware could allow an attacker to execute arbitrary OS commands via a LAN interface. This is due to the lack of measures to neutralize special elements used in the operating system command. The exploitation of this issue may enable an attacker to execute arbitrary commands.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

BDU:2022-01901

CVE-2021-4029

Affected Products

Zyxel Armor Z1/Z2

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2021-4029 · Security Note
• https://osv.dev/vulnerability/CVE-2021-4029 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-01901 · Security Note
• https://zyxel.com/support/forgery-vulnerabilities-of-select-Armor-home-routers.shtml · Vendor Advisory
• https://t.me/cvenotify/27268 · Telegram Post