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Vulnerability record · CVE-2021-47709 · published 9 December 2025

CVE-2021-47709: Missing authentication for critical function vulnerability

COMMAX Smart Home System allows an unauthenticated attacker to change configuration and cause denial-of-service through the setconf endpoint. Attackers can trigger a denial-of-service scenario by sending a malformed request to the setconf endpoint.

8.7 CVSS 4.0 High EPSS 0.35% · top 73.9% CWE-306 · Missing authentication for critical function Deferred
8.7CVSS 4.0 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

COMMAX Smart Home System allows an unauthenticated attacker to change configuration and cause denial-of-service through the setconf endpoint. Attackers can trigger a denial-of-service scenario by sending a malformed request to the setconf endpoint.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://www.commax.com
https://www.exploit-db.com/exploits/50209
https://www.vulncheck.com/advisories/commax-smart-home-ruvie-cctv-bridge-dvr-service-config-write-dos
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5666.php

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Source: NIST National Vulnerability Database (record CVE-2021-47709), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.