CVE-2023-33012

HIGH

Zyxel Usg 20w-vpn Firmware < 5.37 - OS Command Injection

Title source: rule

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.

Exploits (1)

metasploit WORKING POC NORMAL

by SSD Secure Disclosure technical team, jheysel-r7 · rubypoc

https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/zyxel_parse_config_rce.rb

View Code ZIP pw:eip

References (1)

[Vendor Advisory] https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-wlan-controllers

Scores

CVSS v3 8.8

EPSS 0.0857

EPSS Percentile 92.4%

Attack Vector ADJACENT_NETWORK

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-78

Status published

Products (22)

zyxel/usg_20w-vpn_firmware 5.10 - 5.37

zyxel/usg_2200-vpn_firmware 5.00 - 5.37

zyxel/usg_flex_100_firmware 5.00 - 5.37

zyxel/usg_flex_100w_firmware 5.00 - 5.37

zyxel/usg_flex_200_firmware 5.00 - 5.37

zyxel/usg_flex_500_firmware 5.00 - 5.37

zyxel/usg_flex_50_firmware 5.00 - 5.37

zyxel/usg_flex_50w_firmware 5.00 - 5.37

zyxel/usg_flex_700_firmware 5.00 - 5.37

zyxel/zywall_atp100_firmware 5.10 - 5.37

... and 12 more

Published Jul 17, 2023

Tracked Since Feb 18, 2026