An issue was discovered on the Grandstream HT801 Analog Telephone Adaptor before 1.0.29.8.
Priority MEDIUM 42Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.02029 81st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:grandstream:ht801_firmware:*:*:*:*:*:*:*:* | before 1.0.29.8 | Vulnerable | Grandstream |
| cpe:2.3:h:grandstream:ht801:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Grandstream |
- cpe:2.3:o:grandstream:ht801_firmware:*:*:*:*:*:*:*:* Versions before 1.0.29.8 Vulnerable ·Grandstream
- cpe:2.3:h:grandstream:ht801:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Grandstream
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-37915
- 2026-10-03 Alias added: GHSA-mfhv-6c62-c8w2
References
More Grandstream Ht801 Firmware vulnerabilities
- TI-2021-15620 Multiple buffer overflows in the limited configuration shell (/sbin/gs_config) on… CVSS 3.1HIGH 8.8
- TI-2020-04691 Grandstream HT800 series firmware version 1.0.17.5 and below contain a backdoor in the… CVSS 3.1HIGH 8.8
- TI-2020-04688 OS command injection in Grandstream HT800 Series CVSS 3.1HIGH 7.8
- TI-2020-04689 Infinite loop in Grandstream HT800 Series CVSS 3.1HIGH 7.5
- TI-2020-04690 NULL pointer dereference in Grandstream HT800 Series CVSS 3.1HIGH 7.5
Sources
- CVE-2021-37915 · CVE Program
- CVE-2021-37915 · NVD
- FIRST EPSS
- GHSA-mfhv-6c62-c8w2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences