CVE-2020-5759

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-07-17 · updated 2026-06-17
Weakness: CWE-78

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.

Affected products

Grandstream Ucm6202 Firmware: through 1.0.20.23
Grandstream Ucm6204 Firmware: through 1.0.20.23
Grandstream Ucm6208 Firmware: through 1.0.20.23

References

https://www.tenable.com/security/research/tra-2020-42
https://www.tenable.com/cve/CVE-2020-5759
https://www.tenable.com/security/research/tra-2020-42

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