CVE-2021-42071: Visual-Tools Dvr VX16 Firmware

Critical severity, CVSS 9.8. EPSS: 69.9% chance of exploitation in the next 30 days.

In Visual Tools DVR VX16 4.2.28.0, an unauthenticated attacker can achieve remote command execution via shell metacharacters in the cgi-bin/slogin/login.py User-Agent HTTP header.

Affected products

• Visual-Tools Dvr VX16 Firmware: version 4.2.28.0 only

Published 2021-10-07. Last modified 2026-06-17.