CVE-2025-29756
MQTT implementation in Sungrow iSolarCloud allowed users to subscribe to all data of all connected inverters
| CVE | CVE-2025-29756 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Title | MQTT implementation in Sungrow iSolarCloud allowed users to subscribe to all data of all connected inverters | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Case | DIVD-2025-00009 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Problem type(s) | CWE-862 Missing Authorization | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Impact(s) | CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Date published | 08 Jun 2025 22:00 UTC | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Last modified | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Description
SunGrow's back end users system iSolarCloud uses an MQTT service to transport data from the user's connected devices to the user's web browser.
The MQTT server however did not have sufficient restrictions in place to limit the topics that a user could subscribe to.
While the data that is transmitted through the MQTT server is encrypted and the credentials for the MQTT server are obtained though an API call, the credentials could be used to subscribe to any topic and the encryption key can be used to decrypt all messages received.
An attack with an account on iSolarCloud.com could extract MQTT credentials and the decryption key from the browser and then use an external program to subscribe to the topic '#' and thus recieve all messages from all connected devices.
The MQTT server however did not have sufficient restrictions in place to limit the topics that a user could subscribe to.
While the data that is transmitted through the MQTT server is encrypted and the credentials for the MQTT server are obtained though an API call, the credentials could be used to subscribe to any topic and the encryption key can be used to decrypt all messages received.
An attack with an account on iSolarCloud.com could extract MQTT credentials and the decryption key from the browser and then use an external program to subscribe to the topic '#' and thus recieve all messages from all connected devices.
Solution(s)
iSolarCloud has been patched by SunGrow and the vulnerability is no longer exploitable.
JSON version.