What’s Vulnerable › Vulnerabilities

CVE-2021-37748

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 7.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-28 · updated 2026-06-17
• Weakness: CWE-787

Description

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

How to fix

Upgrade to a fixed version: Grandstream Ht801 Firmware 1.0.29. Check the vendor advisory for mitigations.

References

• http://www.grandstream.com/products/gateways-and-atas/analog-telephone-adaptors/product/ht801
• https://github.com/SECFORCE/CVE-2021-37748
• https://www.secforce.com/blog/exploiting-grandstream-ht801-ata-cve-2021-37748-cve-2021-37915/
• http://www.grandstream.com/products/gateways-and-atas/analog-telephone-adaptors/product/ht801
• https://github.com/SECFORCE/CVE-2021-37748
• https://www.secforce.com/blog/exploiting-grandstream-ht801-ata-cve-2021-37748-cve-2021-37915/

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