CVE-2021-47708Public exploitNetwork attack vector

Authentication bypass via unsanitized login identifier

Published Dec 9, 2025 · Updated Jul 15, 2026

SQL injection in COMMAX Smart Home IoT Control System CDP-1020n and 481 System allows remote attackers to bypass authentication. The loginstart.asp handler uses the unsanitized id POST parameter in an SQL query, allowing injected SQL to alter the query's authentication result. An unauthenticated network request is sufficient, and successful exploitation grants unauthorized access to the smart-home control interface.

CVSS severity9.3
Critical
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in COMMAX Smart Home IoT Control System CDP-1020n and 481 System allows remote attackers to bypass authentication. The loginstart.asp handler uses the unsanitized id POST parameter in an SQL query, allowing injected SQL to alter the query's authentication result. An unauthenticated network request is sufficient, and successful exploitation grants unauthorized access to the smart-home control interface.

The record

CVE
CVE-2021-47708
Published
Dec 9, 2025
Updated
Jul 15, 2026
Vendor
COMMAX
Product
Smart Home IoT Control System
Classifications
CWE-89, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=481 System
  2. Affected versionversion=CDP-1020n

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

COMMAX · Smart Home IoT Control Systemversion=481 System; version=CDP-1020n

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
T1190Exploit Public-Facing Application

Public exploit references

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Technologies

Your stack

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Your stack

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