Data Exposure Vulnerability in SunGrow's iSolarCloud MQTT Service
CVE-2025-29756

8.3HIGH

Key Information:

Vendor

Sungrow

Status
Isolarcloud
Vendor
CVE Published:
11 June 2025

What is CVE-2025-29756?

The iSolarCloud backend relies on an MQTT service for transmitting data from connected devices to users. However, the service lacks adequate restrictions, allowing unauthorized subscription to any topic. As a result, attackers with valid iSolarCloud accounts can exploit this weakness to extract MQTT credentials and encryption keys through the browser, granting them access to all messages sent from connected devices. This vulnerability highlights critical lapses in user data protection measures within the MQTT implementation.

Affected Version(s)

iSolarCloud 0 < 7 June 2025

References

https://csirt.divd.nl/CVE-2025-29756
third-party-advisorytechnical-description
https://csirt.divd.nl/DIVD-2025-00009
third-party-advisory
https://isolarcloud.com
product

CVSS V4

Score:
8.3
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Harm van den Brink (DIVD)
Frank Breedijk (DIVD)
ENCS (https://encs.eu/)
.