CVE-2020-5724

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 12.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-03-30 · updated 2026-06-17
Weakness: CWE-89

Description

The Grandstream UCM6200 series before 1.0.20.22 is vulnerable to an SQL injection via the HTTP server's websockify endpoint. A remote unauthenticated attacker can invoke the challenge action with a crafted username and discover user passwords.

Affected products

Grandstream Ucm6202 Firmware: before 1.0.20.22 — fixed in 1.0.20.22
Grandstream Ucm6204 Firmware: before 1.0.20.22 — fixed in 1.0.20.22
Grandstream Ucm6208 Firmware: before 1.0.20.22 — fixed in 1.0.20.22

How to fix

Upgrade to a fixed version: Grandstream Ucm6202 Firmware 1.0.20.22; Grandstream Ucm6204 Firmware 1.0.20.22; Grandstream Ucm6208 Firmware 1.0.20.22. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2020-5724 or the next vulnerability affects your stack