What’s Vulnerable › Vulnerabilities

CVE-2021-3774: Meross MSS550X Missing Encryption of Sensitive Data

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-05 · updated 2026-06-17
• Weakness: CWE-319

Description

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.

Affected products

• Meross Mss550X Firmware: through 3.1.3

References

• https://www.incibe.es/en/incibe-cert/notices/aviso/meross-mss550x-missing-encryption-sensitive-data
• https://www.incibe.es/en/incibe-cert/notices/aviso/meross-mss550x-missing-encryption-sensitive-data

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