CVE-2025-29756Network attack vector

Cross-tenant device-data disclosure via unrestricted MQTT wildcard subscriptions

Published Jun 11, 2025 · Updated Jun 23, 2025

Missing authorization in Sungrow iSolarCloud before 7 June 2025 allows remote authenticated users to read all connected-device MQTT data. The backend MQTT broker accepts the wildcard # subscription with account-derived credentials, while the web client exposes those credentials and a shared RSA decryption key in JavaScript and the DOM. Any iSolarCloud account can therefore decrypt messages from every connected device, rather than only data authorized for that account.

CVSS severity8.3
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Sungrow iSolarCloud before 7 June 2025 allows remote authenticated users to read all connected-device MQTT data. The backend MQTT broker accepts the wildcard # subscription with account-derived credentials, while the web client exposes those credentials and a shared RSA decryption key in JavaScript and the DOM. Any iSolarCloud account can therefore decrypt messages from every connected device, rather than only data authorized for that account.

The record

CVE
CVE-2025-29756
Published
Jun 11, 2025
Updated
Jun 23, 2025
Vendor
Sungrow
Product
iSolarCloud
Classifications
CWE-862
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 2025Record 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=0 <7 June 2025

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Sungrow · iSolarCloudversion=0 <7 June 2025

Published CVSS scores

8.3DIVD CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/AU:Y

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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