CVE-2023-33012 Command injection in ATP series firmware

High 8.8 Published 17 Jul 2023 Updated 5 Mar 2025

Unauthenticated LAN attackers can execute OS commands via crafted GRE configuration in Zyxel firewalls when cloud management is enabled.

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-2023-33012?

CVE-2023-33012 is a high-severity command injection vulnerability in Zyxel ATP series firmware, published on 17 Jul 2023. 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 configuration parser of the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50(W) series firmware versions 5.10 through 5.36 Patch 2, USG20(W)-VPN series firmware versions 5.10 through 5.36 Patch 2, and VPN series firmware versions 5.00 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands by using a crafted GRE configuration when the cloud management mode is enabled.

Weakness: CWE-78

Which versions are affected by CVE-2023-33012?

It affects 22 products.

Products include Zyxel Usg 20w-Vpn Firmware, Zyxel Usg 2200-Vpn Firmware, Zyxel Usg Flex 100 Firmware, Zyxel Usg Flex 100w Firmware, Zyxel Usg Flex 200 Firmware, Zyxel Usg Flex 500 Firmware and 16 more.

How do I fix CVE-2023-33012?

No fix has been published for CVE-2023-33012 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-2023-33012 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-33012 exists.

Public exploit code: 1 Metasploit module.

Sources

Also known as GHSA-r34v-7h65-289c.