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Vulnerability record · CVE-2020-5763 · published 29 July 2020

CVE-2020-5763: Grandstream ht801 firmware inadequate encryption strength vulnerability

Grandstream · Ht801 Firmware

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.

8.8 CVSS 3.1 High EPSS 2.7% · top 14.5% CWE-489 · CWE-489CWE-326 · Inadequate encryption strength
8.8CVSS 3.1 base score, v2 9.0
2.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.tenable.com/security/research/tra-2020-43 ExploitThird Party Advisory
https://www.tenable.com/security/research/tra-2020-47 Third Party AdvisoryVDB Entry
https://www.tenable.com/security/research/tra-2020-43 ExploitThird Party Advisory
https://www.tenable.com/security/research/tra-2020-47 Third Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2021-37748Grandstream ht801 firmware out-of-bounds write vulnerabilityMultiple buffer overflows in the limited configuration shell (/sbin/gs_config) on Grandstream HT801 devices before 1.0.29 allow remote authenticated …EPSS 7.4%8.8CVE-2021-37915Grandstream ht801 firmware vulnerabilityAn issue was discovered on the Grandstream HT801 Analog Telephone Adaptor before 1.0.29.8. From the limited configuration shell, it is possible to se…EPSS 2.0%8.8CVE-2017-16565Grandstream ht802 firmware cross-site request forgery vulnerabilityCross-Site Request Forgery (CSRF) in /cgi-bin/login on Vonage (Grandstream) HT802 devices allows attackers to authenticate a user via the login scree…EPSS 0.49%8.0CVE-2017-16563Grandstream ht802 firmware cross-site request forgery vulnerabilityCross-Site Request Forgery (CSRF) in the Basic Settings screen on Vonage (Grandstream) HT802 devices allows attackers to modify settings, related to …EPSS 0.44%7.8CVE-2020-5760Grandstream ht801 firmware os command injection vulnerabilityGrandstream HT800 series firmware version 1.0.17.5 and below is vulnerable to an OS command injection vulnerability. Unauthenticated remote attackers…EPSS 5.5%7.5CVE-2020-5761Grandstream ht801 firmware vulnerabilityGrandstream HT800 series firmware version 1.0.17.5 and below is vulnerable to CPU exhaustion due to an infinite loop in the TR-069 service. Unauthent…EPSS 4.1%7.5CVE-2020-5762Grandstream ht801 firmware null pointer dereference vulnerabilityGrandstream HT800 series firmware version 1.0.17.5 and below is vulnerable to a denial of service attack against the TR-069 service. An unauthenticat…EPSS 3.4%5.4CVE-2017-16564Grandstream ht802 firmware cross-site scripting vulnerabilityStored Cross-site scripting (XSS) vulnerability in /cgi-bin/config2 on Vonage (Grandstream) HT802 devices allows remote authenticated users to inject…EPSS 0.61%

Source: NIST National Vulnerability Database (record CVE-2020-5763), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.