CVE-2021-47709

CVE-2021-47709 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. 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-306.

Key facts

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.

Frequently asked questions

What is CVE-2021-47709?
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.
How severe is CVE-2021-47709?
CVE-2021-47709 has a CVSS 4.0 base score of 8.7, rated high severity.
Is CVE-2021-47709 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2021-47709?
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.
Does CVE-2021-47709 have an EU (EUVD) identifier?
Yes. CVE-2021-47709 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-34730.
When was CVE-2021-47709 published?
CVE-2021-47709 was published on 2025-12-09 and last updated on 2026-06-17.

References

Other CWE-306 (Missing Authentication for Critical Function) vulnerabilities

Browse all CWE-306 (Missing Authentication for Critical Function) vulnerabilities →