Broadband Forum CWMP

CWMP, or CPE WAN Management Protocol, operates on port 7547 and is used by ISPs and network operators to remotely manage customer-premises equipment (CPE). This protocol facilitates tasks such as firmware updates, diagnostics, and configuration changes, ensuring devices are up-to-date and functioning correctly.

What is Broadband Forum CWMP

CWMP, or CPE WAN Management Protocol, is a protocol defined by the Broadband Forum in the TR-069 specification. It operates on port 7547 and is primarily used by Internet Service Providers (ISPs) and network operators to remotely manage customer-premises equipment (CPE) such as modems, routers, and gateways. This remote management capability allows for efficient deployment, monitoring, and maintenance of network devices.

The protocol supports a variety of functions including firmware updates, diagnostics, and configuration changes. By using CWMP, ISPs can ensure that devices are running the latest software versions, apply necessary patches, and troubleshoot issues without requiring physical access to the equipment. This not only improves service reliability but also reduces operational costs.

Historically, CWMP has been instrumental in the mass deployment of broadband services, enabling ISPs to scale their operations while maintaining control over the network infrastructure. However, the protocol has also been a target for security vulnerabilities, necessitating robust security measures to protect against unauthorized access and potential exploits.

Broadband Forum CWMP runs on TCP and UDP port 7547 and is official IANA port.

Security risk

If port 7547 is open and the CWMP service is running, it can be a target for cyber-attacks. Unauthorized access could lead to the compromise of network devices, allowing attackers to change configurations, install malicious firmware, or disrupt services. Ensuring proper security measures, such as authentication and encryption, is crucial to mitigate these risks.

In our UFW tutorial you can follow instructions how you can configure UFW to close port 7547. Use StackChanges to monitor if the Broadband Forum CWMP port is closed and stays closed. StackChanges will send an alert if port 7547 is open again.