Meross MSS550X Missing Encryption of Sensitive Data

Posted date
4 - Alta
Affected Resources

Smart Wi-Fi 2 Way Wall Switch (MSS550X) 3.1.3 version and below.


INCIBE has coordinated the publication of a vulnerability in Meross MSS550X, with the internal code INCIBE-2021-0451, which has been discovered by Gerard Fuguet Morales.

CVE-2021-3774 has been assigned to this vulnerability. A CVSS v3.1 base score of 7.4 has been calculated; the CVSS vector string is AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N.


This vulnerability has been solved by Meross in MSS550X version 3.2.3.


Meross Smart Wi-Fi 2 Way Wall Switch (MSS550X), on its 3.1.3 version and before, creates an open Wi-Fi Access Point without the required security measures in its initial setup.

This could allow a remote attacker to obtain the Wi-Fi SSID as well as the password configured by the user from Meross app via Http/JSON plain request.

CWE-319: Cleartext Transmission of Sensitive Information.

If you have any information regarding this advisory, please contact INCIBE as indicated in the CVE Assignment and publication section.

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