CVE-2021-33818: UI Camera g3 Flex Firmware

High severity, CVSS 7.5. EPSS: 1.9% chance of exploitation in the next 30 days.

An issue was discovered in UniFi Protect G3 FLEX Camera Version UVC.v4.30.0.67. Attackers can use slowhttptest tool to send incomplete HTTP request, which could make server keep waiting for the packet to finish the connection, until its resource exhausted. Then the web server is denial-of-service.

Affected products

• UI Camera g3 Flex Firmware: version uvc.v4.30.0.67 only

Published 2021-06-18. Last modified 2026-06-17.