CVE-2021-47708

CVE-2021-47708 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.3. 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-89.

Key facts

Description

COMMAX Smart Home System CDP-1020n contains an SQL injection vulnerability that allows attackers to bypass authentication by injecting arbitrary SQL code through the 'id' parameter in 'loginstart.asp'. Attackers can exploit this by sending a POST request with malicious 'id' values to manipulate database queries and gain unauthorized access.

Frequently asked questions

What is CVE-2021-47708?
COMMAX Smart Home System CDP-1020n contains an SQL injection vulnerability that allows attackers to bypass authentication by injecting arbitrary SQL code through the 'id' parameter in 'loginstart.asp'. Attackers can exploit this by sending a POST request with malicious 'id' values to manipulate database queries and gain unauthorized access.
How severe is CVE-2021-47708?
CVE-2021-47708 has a CVSS 4.0 base score of 9.3, rated critical severity.
Is CVE-2021-47708 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2021-47708?
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.
Does CVE-2021-47708 have an EU (EUVD) identifier?
Yes. CVE-2021-47708 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-34731.
When was CVE-2021-47708 published?
CVE-2021-47708 was published on 2025-12-09 and last updated on 2026-06-17.

References

Other CWE-89 (SQL Injection) vulnerabilities

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