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Have a unique firmware experience with your B311-221? Share your version number and tips in the comments below to help the community stay updated.

A known vulnerability (CVE-2021-39940) in the api/system/deviceinfo endpoint allows command injection due to improper sanitization of the mac parameter:

Huawei B311-221 is a popular 4G LTE Cat4 desktop router known for its compact design and efficiency. Maintaining its firmware is essential for network stability, security, and performance improvements. The Technology Doctors Firmware Overview & Key Features

Huawei B311-221 Firmware Jun 2026

Have a unique firmware experience with your B311-221? Share your version number and tips in the comments below to help the community stay updated.

A known vulnerability (CVE-2021-39940) in the api/system/deviceinfo endpoint allows command injection due to improper sanitization of the mac parameter: Huawei B311-221 Firmware

Huawei B311-221 is a popular 4G LTE Cat4 desktop router known for its compact design and efficiency. Maintaining its firmware is essential for network stability, security, and performance improvements. The Technology Doctors Firmware Overview & Key Features Have a unique firmware experience with your B311-221

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