CVE-2021-21805: Advantech R-Seenet

Critical severity, CVSS 9.8. EPSS: 69.8% chance of exploitation in the next 30 days.

An OS Command Injection vulnerability exists in the ping.php script functionality of Advantech R-SeeNet v 2.4.12 (20.10.2020). A specially crafted HTTP request can lead to arbitrary OS command execution. An attacker can send a crafted HTTP request to trigger this vulnerability.

Affected products

• Advantech R-Seenet: version 2.4.12 only

Published 2021-08-05. Last modified 2026-06-17.