CVE-2021-33822: SING4G 4gee Router HH70VB Firmware

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

An issue was discovered on 4GEE ROUTER HH70VB Version HH70_E1_02.00_22. 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

• SING4G 4gee Router HH70VB Firmware: version hh70_e1_02.00_22 only

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