How severe is CVE-2020-5759?

CVE-2020-5759 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-5759 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5759?

CVE-2020-5759 primarily affects Grandstream Ucm6202 Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-5759?

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

When was CVE-2020-5759 published?

CVE-2020-5759 was published on 2020-07-17 and last updated on 2026-06-17.

CVE-2020-5759

CVE-2020-5759 is a critical-severity vulnerability in Grandstream Ucm6202 Firmware with a CVSS 3.x base score of 9.8. 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Grandstream Ucm6202 Firmware
Published: 2020-07-17
Last modified: 2026-06-17

Description

Grandstream UCM6200 series firmware version 1.0.20.23 and below is vulnerable to OS command injection via SSH. An authenticated remote attacker can execute commands as the root user by issuing a specially crafted "unset" command.

Frequently asked questions

What is CVE-2020-5759?: Grandstream UCM6200 series firmware version 1.0.20.23 and below is vulnerable to OS command injection via SSH. An authenticated remote attacker can execute commands as the root user by issuing a specially crafted "unset" command.
How severe is CVE-2020-5759?: CVE-2020-5759 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-5759 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5759?: CVE-2020-5759 primarily affects Grandstream Ucm6202 Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-5759?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-5759 published?: CVE-2020-5759 was published on 2020-07-17 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:grandstream:ucm6202_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:grandstream:ucm6204_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:grandstream:ucm6208_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Grandstream Ucm6202 Firmware

CVE-2020-5757 — Critical (CVSS 9.8): Grandstream UCM6200 series firmware version 1.0.20.23 and below is vulnerable to OS command injection via HTTP. An…
CVE-2020-5723 — Critical (CVSS 9.8): The UCM6200 series 1.0.20.22 and below stores unencrypted user passwords in an SQLite database. This could allow an…
CVE-2020-5758 — High (CVSS 8.8): Grandstream UCM6200 series firmware version 1.0.20.23 and below is vulnerable to OS command injection via HTTP. An…
CVE-2020-5726 — High (CVSS 7.5): The Grandstream UCM6200 series before 1.0.20.22 is vulnerable to an SQL injection via the CTI server on port 8888. A…
CVE-2020-5724 — High (CVSS 7.5): The Grandstream UCM6200 series before 1.0.20.22 is vulnerable to an SQL injection via the HTTP server's websockify…
CVE-2020-5725 — Medium (CVSS 5.9): The Grandstream UCM6200 series before 1.0.20.22 is vulnerable to an SQL injection via the HTTP server's websockify…

All CVEs affecting Grandstream Ucm6202 Firmware →

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