What is CVE-2021-4029?

CVE-2021-4029 is a high-severity vulnerability in Zyxel Armor Z1 (Nbg6816) Firmware, classified under OS Command Injection. CVSS score: 8.8/10. Published 2022-02-24.

How severe is CVE-2021-4029?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Zyxel Armor Z1 (Nbg6816) Firmware

CVE-2021-4029

A command injection vulnerability in the CGI program of the Zyxel ARMOR Z1/Z2 firmware could allow an attacker to execute arbitrary OS commands via a LAN interface.

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.007 (51.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Zyxel Armor Z1 (Nbg6816) Firmware — versions 1.00(AAWB.10)C0
Zyxel Armor Z2 (Nbg6817) Firmware — versions 1.00(ABCS.10)C0
Zyxel Nbg6816
Zyxel Nbg6816_firmware — versions 1.00\(aawb.10\)c0
Zyxel Nbg6817
Zyxel Nbg6817_firmware

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

security@zyxel.com.tw (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2021-4029?: CVE-2021-4029 is a high-severity vulnerability in Zyxel Armor Z1 (Nbg6816) Firmware, classified under OS Command Injection. CVSS score: 8.8/10. Published 2022-02-24.
How severe is CVE-2021-4029?: High severity. CVSS v3 base score is 8.8 out of 10.