Vulnerability identifier: #VU60816

Vulnerability risk: Low

CVSSv3.1: 7.3 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-4029

CWE-ID: CWE-78

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
NBG6816 (Armor Z1)
Hardware solutions / Firmware
NBG6817 (Armor Z2)
Hardware solutions / Firmware

Vendor: ZyXEL Communications Corp.

Description

The vulnerability allows a local attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation. A local attacker can execute arbitrary OS commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

NBG6816 (Armor Z1): All versions

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External links
http://www.zyxel.com/support/forgery-vulnerabilities-of-select-Armor-home-routers.shtml

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.