Firetruck

CVE-2023-33009

KEV
Updated Oct 21, 2025 · PUBLISHED
View KEV entry →

Description

Zyxel ATP, USG FLEX, USG FLEX 50(W), USG20(W)-VPN, VPN, and ZyWALL/USG firewalls contain a buffer overflow vulnerability in the notification function that could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and remote code execution on an affected device.

Full record on cve.org →

Affected packages

PackageVendor / ProductVersion rangeStatus
ATP series firmwareZyxel / ATP series firmware4.60 through 5.36 Patch 1affected
USG20(W)-VPN firmwareZyxel / USG20(W)-VPN firmware4.60 through 5.36 Patch 1affected
USG FLEX 50(W) firmwareZyxel / USG FLEX 50(W) firmware4.60 through 5.36 Patch 1affected
USG FLEX series firmwareZyxel / USG FLEX series firmware4.60 through 5.36 Patch 1affected
VPN series firmwareZyxel / VPN series firmware4.60 through 5.36 Patch 1affected
ZyWALL/USG series firmwareZyxel / ZyWALL/USG series firmware4.60 through 4.73 Patch 1affected