Grandstream HT800 series firmware version 1.0.17.5 and below contain a backdoor in the…
Priority MEDIUM 43CWE-489Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-326.
Summary
Grandstream HT800 series firmware version 1.0.17.5 and below contain a backdoor in the SSH service. An authenticated remote attacker can obtain a root shell by correctly answering a challenge prompt.
Why it matters now
EPSS 0.02726 86th 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 |
|---|---|---|---|---|---|
| — | Grandstream HT800 Series | up to 1.0.17.5 | — | No fix listed | CNA |
- Grandstream HT800 Series Vendor— Affected up to 1.0.17.5 Fixed in — No fix listed CNA
CPE configurations NVD · 12
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:grandstream:ht801_firmware:*:*:*:*:*:*:*:* | up to 1.0.17.5 | Vulnerable | Grandstream |
| cpe:2.3:h:grandstream:ht801:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Grandstream |
| cpe:2.3:o:grandstream:ht802_firmware:*:*:*:*:*:*:*:* | up to 1.0.17.5 | Vulnerable | Grandstream |
| cpe:2.3:h:grandstream:ht802:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Grandstream |
| cpe:2.3:o:grandstream:ht812_firmware:*:*:*:*:*:*:*:* | up to 1.0.17.5 | Vulnerable | Grandstream |
| cpe:2.3:h:grandstream:ht812:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Grandstream |
| cpe:2.3:o:grandstream:ht814_firmware:*:*:*:*:*:*:*:* | up to 1.0.17.5 | Vulnerable | Grandstream |
| cpe:2.3:h:grandstream:ht814:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Grandstream |
| cpe:2.3:o:grandstream:ht818_firmware:*:*:*:*:*:*:*:* | up to 1.0.17.5 | Vulnerable | Grandstream |
| cpe:2.3:h:grandstream:ht818:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Grandstream |
- cpe:2.3:o:grandstream:ht801_firmware:*:*:*:*:*:*:*:* Versions up to 1.0.17.5 Vulnerable ·Grandstream
- cpe:2.3:h:grandstream:ht801:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Grandstream
- cpe:2.3:o:grandstream:ht802_firmware:*:*:*:*:*:*:*:* Versions up to 1.0.17.5 Vulnerable ·Grandstream
- cpe:2.3:h:grandstream:ht802:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Grandstream
- cpe:2.3:o:grandstream:ht812_firmware:*:*:*:*:*:*:*:* Versions up to 1.0.17.5 Vulnerable ·Grandstream
- cpe:2.3:h:grandstream:ht812:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Grandstream
- cpe:2.3:o:grandstream:ht814_firmware:*:*:*:*:*:*:*:* Versions up to 1.0.17.5 Vulnerable ·Grandstream
- cpe:2.3:h:grandstream:ht814:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Grandstream
- cpe:2.3:o:grandstream:ht818_firmware:*:*:*:*:*:*:*:* Versions up to 1.0.17.5 Vulnerable ·Grandstream
- cpe:2.3:h:grandstream:ht818:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Grandstream
Show 2 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:grandstream:ht813_firmware:*:*:*:*:*:*:*:* | up to 1.0.17.5 | Vulnerable | Grandstream |
| cpe:2.3:h:grandstream:ht813:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Grandstream |
- cpe:2.3:o:grandstream:ht813_firmware:*:*:*:*:*:*:*:* Versions up to 1.0.17.5 Vulnerable ·Grandstream
- cpe:2.3:h:grandstream:ht813:-:*:*:*:*:*:*:* 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-2020-5763
- 2026-10-03 Alias added: GHSA-h2gv-99w3-wrfr
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-2021-15675 An issue was discovered on the Grandstream HT801 Analog Telephone Adaptor before 1.0.29.8. 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-2020-5763 · CVE Program
- CVE-2020-5763 · NVD
- FIRST EPSS
- GHSA-h2gv-99w3-wrfr · 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