CVE-2021-37748

Name: CVE-2021-37748
Creator: NVD / NIST
Published: 2021-10-28T12:15:08.413+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 7.29%

Last modified Jun 17, 2026

CVE-2021-37748 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 7.29% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

7.29%

93.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Grandstream	Ht801 Firmware	< 1.0.29

References

http://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
http://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

Timeline

Published: Oct 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-37748?

How severe is CVE-2021-37748?

CVE-2021-37748 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 7.29% probability of exploitation in the next 30 days.

How do I fix CVE-2021-37748?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-37748?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST