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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Zyxel | ATP series firmware | 5.10 through 5.36 Patch 2 | — |
| Zyxel | USG FLEX series firmware | 5.00 through 5.36 Patch 2 | — |
| Zyxel | USG FLEX 50(W) series firmware | 5.10 through 5.36 Patch 2 | — |
| Zyxel | USG20(W)-VPN series firmware | 5.10 through 5.36 Patch 2 | — |
| Zyxel | VPN series firmware | 5.00 through 5.36 Patch 2 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Metasploit 1 module
-
Zyxel parse_config.py Command Injection
exploit/linux/http/zyxel_parse_config_rce
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 1
- WID-SEC-2023-1765 Zyxel Firewall: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 17, 2023