CVE-2021-37748

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.

• CWE-787

• https://www.grandstream.com/products/gateways-and-atas/analog-telephone-adaptors/product/ht801Product, Vendor Advisory
• https://github.com/SECFORCE/CVE-2021-37748Third Party Advisory
• https://www.secforce.com/blog/exploiting-grandstream-ht801-ata-cve-2021-37748-cve-2021-37915/Exploit, Third Party Advisory
• https://www.grandstream.com/products/gateways-and-atas/analog-telephone-adaptors/product/ht801Product, Vendor Advisory
• https://github.com/SECFORCE/CVE-2021-37748Third Party Advisory
• https://www.secforce.com/blog/exploiting-grandstream-ht801-ata-cve-2021-37748-cve-2021-37915/Exploit, Third Party Advisory

Published

Oct 28, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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