CVE-2021-4029 Command injection in ARMOR Z1 (NBG6816) firmware
Attackers can execute arbitrary OS commands on Zyxel ARMOR Z1/Z2 routers via the LAN interface due to a command injection flaw in the CGI program.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-4029?
CVE-2021-4029 is a high-severity command injection vulnerability in Zyxel ARMOR Z1 (NBG6816) firmware, published on 22 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-78
Which versions are affected by CVE-2021-4029?
It affects 2 products.
Products include Zyxel Nbg6816 Firmware, Zyxel Nbg6817 Firmware.
How do I fix CVE-2021-4029?
No fix has been published for CVE-2021-4029 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2021-4029 being exploited?
There is no known exploitation of CVE-2021-4029 in the wild and no public exploit code.
Other vulnerabilities in Zyxel ARMOR Z1 (NBG6816) firmware
Sources
Also known as GHSA-47g9-xhm7-62xr.