CVE-2020-5763

Name: CVE-2020-5763
Creator: NVD / NIST
Published: 2020-07-29T19:15:15.2+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.73%

Last modified Jun 17, 2026

CVE-2020-5763 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 2.73% chance of exploitation in the next 30 days.

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.

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

2.73%

84.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Grandstream	Ht801 Firmware	<= 1.0.17.5
Grandstream	Ht802 Firmware	<= 1.0.17.5
Grandstream	Ht812 Firmware	<= 1.0.17.5
Grandstream	Ht814 Firmware	<= 1.0.17.5
Grandstream	Ht818 Firmware	<= 1.0.17.5
Grandstream	Ht813 Firmware	<= 1.0.17.5

References

https://www.tenable.com/security/research/tra-2020-43Exploit, Third Party Advisory
https://www.tenable.com/security/research/tra-2020-47Third Party Advisory, VDB Entry
https://www.tenable.com/security/research/tra-2020-43Exploit, Third Party Advisory
https://www.tenable.com/security/research/tra-2020-47Third Party Advisory, VDB Entry

Timeline

Published: Jul 29, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-5763?

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.

How severe is CVE-2020-5763?

CVE-2020-5763 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.73% probability of exploitation in the next 30 days.

How do I fix CVE-2020-5763?

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-2020-5763?

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

Scan your code now

Source: NVD / NIST