CVE-2021-37748 json
Multiple buffer overflows in the limited configuration shell (/sbin/gs_config) on Grandstream HT801 devices before 1.0.29 allow remote auth…
published 2021-10-28 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24229
- cvss
- 8.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 7.4%
- EPSS 7.4% chance of exploitation in 30 days, percentile 94%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- grandstream ht801_firmware 1.0.29
Exploit prediction
7.41% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- secforce.com https://www.secforce.com/blog/exploiting-grandstream-ht801-ata-cve-2021-37748-cve-2021-37915/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 9.0 | AV:N/AC:L/Au:S/C:C/I:C/A:C |
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
secforce.com
/blog/exploiting-grandstream-ht801-ata-cve-2021-37748-cve-2021-37915/
exploit, third-party-advisory
-
grandstream.com
/products/gateways-and-atas/analog-telephone-adaptors/product/ht801
product, vendor-advisory
-
github.com
/SECFORCE/CVE-2021-37748
third-party-advisory
Sources
- CVE List CVE-2021-37748
- NVD CVE-2021-37748
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