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Port 651IEEE MMS

IEEE MMS (Manufacturing Message Specification) on port 651 facilitates standardized real-time messaging for industrial automation systems. It is widely used to exchange information between manufacturing equipment and control systems, enabling reliable data transfer and machine interaction in diverse automation environments..

inNetwork ServicesSystemIoT
transport
tcp · udp

2 transports registered

in transit
cleartext

payload readable on path

assignment
official

registered with iana

risk
4/10

caution

lookups
4,823

rank 936 of 993 · top 94%

Technical Details

what runs on :651

The IEEE Manufacturing Message Specification (MMS) protocol is a part of the IEC 61850 standard for substation automation and supports communication in manufacturing environments. MMS provides a standardized messaging framework for exchanging information and controlling devices across various industrial control systems. It enhances interoperability among different vendors' hardware by offering a universal data model and service interface.

Operating primarily over TCP and UDP, MMS enables real-time data acquisition, device management, event reporting, and remote control functionalities. It supports various operations such as reading/writing variable content, file transfers, directory management, and status monitoring of industrial assets. MMS is extensible, supporting complex data types designed for the detailed interaction demands of industrial automation.

IEEE MMS plays a vital role in Supervisory Control and Data Acquisition (SCADA) systems, Distributed Control Systems (DCS), and Remote Terminal Units (RTUs). Integration with IEC 61850 broadens MMS's functionality to include intelligent electronic device (IED) communication for power grid automation and utility systems.

Security Information

exposure of :651

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

network services averages 3.9 across 604 ports — this one sits 0.1 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

Common vulnerabilities associated with MMS deployments include:

  • Lack of encryption: Since communications are typically unencrypted, sensitive operational data can be intercepted.
  • Weak authentication: Insecure or absent authentication mechanisms make impersonation and unauthorized access possible.
  • Exposure to denial-of-service: Attackers may flood MMS-enabled devices with malicious traffic to disrupt industrial operations.
  • Input validation flaws: Can lead to buffer overflows or command injection, compromising system stability.

Mitigations for securing MMS communications include:

  • Network segmentation: Isolate industrial control networks from corporate and external networks to reduce attack surfaces.
  • Encryption: Implement VPNs or IPsec tunnels to protect MMS data in transit.
  • Access controls: Enforce strict authentication and authorization policies for all connections.
  • Regular patching: Keep firmware and software updated against known vulnerabilities.
  • Monitoring: Use intrusion detection systems to identify unusual traffic patterns or unauthorized access attempts.

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risk mix of the 8 listed

  • caution100%

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