CVE-2022-45440: Zyxel AX7501-b0 Firmware

Medium severity, CVSS 4.4. EPSS: 0.2% chance of exploitation in the next 30 days.

A vulnerability exists in the FTP server of the Zyxel AX7501-B0 firmware prior to V5.17(ABPC.3)C0, which processes symbolic links on external storage media. A local authenticated attacker with administrator privileges could abuse this vulnerability to access the root file system by creating a symbolic link on external storage media, such as a USB flash drive, and then logging into the FTP server on a vulnerable device.

Affected products

• Zyxel AX7501-b0 Firmware: before 5.17\(abpc.3\)c0 (fixed in 5.17\(abpc.3\)c0)

Published 2023-01-17. Last modified 2026-06-17.