CVE-2023-33011

HIGH

Zyxel Firewalls and WLAN Controllers 5.00-5.36 Patch 2 - Unauthenticated Remote Code Execution via PPPoE Configuration

Title source: llm

Description

A format string vulnerability in 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 PPPoE configuration on an affected device when the cloud management mode is enabled.

References (1)

Core 1

Core References

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 0.0030

EPSS Percentile 21.8%

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-134

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