CVE-2023-28767

HIGH

Zyxel ATP/USG FLEX/USG20(W)-VPN/VPN <5.36 - Command Injection

Title source: llm

Description

The configuration parser fails to sanitize user-controlled input in the Zyxel ATP series firmware versions 5.10 through 5.36, USG FLEX series firmware versions 5.00 through 5.36, USG FLEX 50(W) series firmware versions 5.10 through 5.36, USG20(W)-VPN series firmware versions 5.10 through 5.36, and VPN series firmware versions 5.00 through 5.36. An unauthenticated, LAN-based attacker could leverage the vulnerability to inject some operating system (OS) commands into the device configuration data on an affected device when the cloud management mode is enabled.

References (1)

Core 1

Core References

Vendor Advisory 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 0.0014

EPSS Percentile 33.5%

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