How severe is CVE-2020-5763?

CVE-2020-5763 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-5763 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5763?

CVE-2020-5763 primarily affects Grandstream Ht801 Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-5763?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-5763 published?

CVE-2020-5763 was published on 2020-07-29 and last updated on 2026-06-17.

CVE-2020-5763

CVE-2020-5763 is a high-severity vulnerability in Grandstream Ht801 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-326.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-326
Affected product: Grandstream Ht801 Firmware
Published: 2020-07-29
Last modified: 2026-06-17

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.

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 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-5763 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5763?: CVE-2020-5763 primarily affects Grandstream Ht801 Firmware. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-5763?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-5763 published?: CVE-2020-5763 was published on 2020-07-29 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:o:grandstream:ht801_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:grandstream:ht802_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:grandstream:ht812_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:grandstream:ht814_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:grandstream:ht818_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:grandstream:ht813_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Grandstream Ht801 Firmware

CVE-2021-37915 — High (CVSS 8.8): An issue was discovered on the Grandstream HT801 Analog Telephone Adaptor before 1.0.29.8. From the limited…
CVE-2021-37748 — High (CVSS 8.8): Multiple buffer overflows in the limited configuration shell (/sbin/gs_config) on Grandstream HT801 devices before…
CVE-2020-5760 — High (CVSS 7.8): Grandstream HT800 series firmware version 1.0.17.5 and below is vulnerable to an OS command injection vulnerability.…
CVE-2020-5762 — High (CVSS 7.5): Grandstream HT800 series firmware version 1.0.17.5 and below is vulnerable to a denial of service attack against the…
CVE-2020-5761 — High (CVSS 7.5): Grandstream HT800 series firmware version 1.0.17.5 and below is vulnerable to CPU exhaustion due to an infinite loop in…

All CVEs affecting Grandstream Ht801 Firmware →

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