CVE-2022-40740: Realtek Usdk

High severity, CVSS 7.2. EPSS: 1.5% chance of exploitation in the next 30 days.

Realtek GPON router has insufficient filtering for special characters. A remote attacker authenticated as an administrator can exploit this vulnerability to perform command injection attacks, to execute arbitrary system command, manipulate system or disrupt service.

Affected products

• Realtek Usdk: version 1.0 only; version 2.0 only; version 2.2 only
• Realtek Xpon Software Development Kit: version 1.9 only; version 3.3 only; version 4.0 only; version 4.1 only

Published 2023-01-03. Last modified 2026-06-17.