EG4 Inverter Vulnerabilities Analysis (CVE-2021-32657 to 32660)

Critical Vulnerability Information 1. Vulnerability Overview CVE IDs: CVE-2021-32657, CVE-2021-32658, CVE-2021-32659, CVE-2021-32660 Affected Products: EG4 Electronics' EG4 series inverters, including models EG4-2K, EG4-3K, EG4-4K, etc. Risk Assessment: Successful exploitation of these vulnerabilities could lead to unauthorized access to internal and external networks, device control, sensitive data exfiltration, configuration file tampering, and malicious firmware updates. 2. Technical Details 2.1 Affected Products Comprehensive list of all affected EG4 series inverter models. 2.2 Vulnerability Summary 2.2.1 Transmission of Sensitive Information in Clear Text (CWE-319) Sensitive information is transmitted in plaintext, potentially intercepted and exploited for unauthorized access, modification, deletion, or replay attacks. CVSS Score: 6.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) 2.2.2 Download Code Without Integrity Check (CWE-494) Firmware updates downloaded via HTTP lack integrity verification, enabling potential injection of malicious software. CVSS Score: 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N) 2.2.3 Observable Differences (CWE-203) Device responses vary based on operational state, potentially revealing actual device status. CVSS Score: 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) 2.2.4 Inadequate Limit on Authentication Attempts (CWE-307) Authentication mechanism imposes insufficient limits on failed login attempts, allowing unlimited retries and increasing risk of brute-force attacks. CVSS Score: 5.9 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N) 3. Background Critical Infrastructure Sector: Energy Deployment Countries/Regions: Global Company/Acquirer Location: United States 4. Mitigation Measures Update firmware to the latest version. Implement strong password policies. Configure firewall rules to restrict unnecessary network access. Regularly monitor system logs for signs of anomalous activity.

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EG4 Inverter Vulnerabilities Analysis (CVE-2021-32657 to 32660)