CVE-2021-37915: Grandstream HT801 Firmware

High severity, CVSS 8.8. EPSS: 2% chance of exploitation in the next 30 days.

An issue was discovered on the Grandstream HT801 Analog Telephone Adaptor before 1.0.29.8. From the limited configuration shell, it is possible to set the malicious gdb_debug_server variable. As a result, after a reboot, the device downloads and executes malicious scripts from an attacker-defined host.

Affected products

• Grandstream HT801 Firmware: before 1.0.29.8 (fixed in 1.0.29.8)

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