CVE-2021-37748: Grandstream HT801 Firmware

High severity, CVSS 8.8. EPSS: 7.4% chance of exploitation in the next 30 days.

Multiple buffer overflows in the limited configuration shell (/sbin/gs_config) on Grandstream HT801 devices before 1.0.29 allow remote authenticated users to execute arbitrary code as root via a crafted manage_if setting, thus bypassing the intended restrictions of this shell and taking full control of the device. There are default weak credentials that can be used to authenticate.

Affected products

• Grandstream HT801 Firmware: before 1.0.29 (fixed in 1.0.29)

Published 2021-10-28. Last modified 2026-06-17.