Service:
Protocol:
TCPPort:
7547Used for:
Port 7547 is used by ISPs to manage routers and modems remotely via the CWMP/TR-069 protocol.Why It’s Open
Port 7547 is used by the CPE WAN Management Protocol (CWMP), also known as TR-069. This protocol is used by Internet Service Providers (ISPs) to remotely manage customer-premises equipment (CPE) such as routers, modems, VoIP gateways, and other embedded devices. Through CWMP, ISPs can push firmware updates, change configurations, and monitor performance — all without requiring user interaction.
This port is typically open on the ISP side or on CPE devices awaiting instructions from an Auto Configuration Server (ACS). In ideal deployments, communication occurs over a secure management channel and is not exposed to the public internet. Unfortunately, many devices are misconfigured or shipped with TR-069 exposed externally.
Common Risks
- Remote Code Execution (RCE)
Multiple CVEs have shown that improperly handled CWMP requests can allow attackers to run arbitrary commands on routers. - Device Takeover
If TR-069 is exposed and lacks proper authentication or validation, attackers can reconfigure network settings, DNS servers, or redirect traffic. - Information Disclosure
Devices may leak internal network information, firmware version, MAC addresses, and other sensitive data in response to malformed or unauthenticated queries. - Botnet Recruitment
TR-069 vulnerabilities have been weaponized in botnets like Mirai and Annie, where hundreds of thousands of routers were compromised in mass scans. - TLS Not Enforced
Some devices communicate over HTTP instead of HTTPS, exposing management credentials and commands to sniffing or MITM attacks.
Want to save time on reporting?
Let PentestPad generate, track, and export your reports - automatically.
Enumeration & Testing
Check if it’s open
nmap -sT -p 7547Send CWMP request (use caution):
curl http://:7547/ -vLook for banner or SOAP/XML response headers:
Use telnet <ip> 7547 or Wireshark filter: tcp.port == 7547
What to Look For
| Checkpoint | What it means |
|---|---|
| Port 7547 open externally | Device is reachable over public internet — major red flag |
| No authentication or TLS | ISP or attacker can send unauthenticated management requests |
| Responds to unauthenticated XML | May be vulnerable to CWMP injection or command execution |
| Known device model/firmware | May be listed in public exploit databases or botnet targets |
Mitigation
- Block External Access to Port 7547
Ensure only trusted ACS IPs can reach CPE devices on this port. Ideally, use firewall rules at both ends. - Enforce HTTPS and Strong Authentication
Use HTTPS with client-side certificate validation to authenticate ACS servers. - Disable CWMP/TR-069 If Not Used
Most home users don’t need it. ISPs should disable it for unsupported devices. - Regular Firmware Updates
Keep firmware updated to patch known CWMP/TR-069 vulnerabilities. - Network Segmentation for CPE Devices
Deploy CPEs on management VLANs with strict egress/ingress filtering.
Known CVEs and Exploits
- CVE-2017-17215 – Huawei routers allow RCE via port 7547 and TR-064.
- CVE-2014-4018 – ZynOS-based routers command injection via SOAPAction in TR-069.
- CVE-2018-10561 – TR-069 unauthenticated command execution in Dasan GPON routers.
- Mirai Botnet Port 7547 Analysis – Real-world breakdown of botnet abuse.
- Exploit-DB 43155 – SOAP-based TR-064 command injection over 7547.