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Port 8442CyBro A-bus

CyBro A-bus is an industrial automation communication protocol developed by Cybrotech Ltd., typically used for managing programmable logic controllers (PLCs) and automation systems. By operating on port 8442, it facilitates supervisory control and integration of field devices in industrial environments. This port supports both TCP and UDP for flexible communication in industrial networks..

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
11,617

rank 347 of 993 · top 35%

Technical Details

what runs on :8442

CyBro A-bus is a proprietary protocol utilized primarily in Cybrotech Ltd.'s automation hardware and software products. It enables real-time data exchange between programmable controllers, control panels, and supervisory systems, simplifying process monitoring and control tasks in manufacturing and industrial settings. This port, 8442, serves as the endpoint for these communications over both TCP and UDP transport layers, offering reliability and multicast capabilities respectively for efficient data handling.

Typical deployments involve a master device or server communicating with multiple slave devices or remote I/O modules. The protocol ensures synchronized operations and supports configuration, firmware updates, and data logging. Because of its dual-stack support (TCP and UDP), it can adapt to different network topologies and performance requirements, balancing reliability with speed.

CyBro A-bus usually operates within closed industrial networks isolated from public Internet exposure. Integration into SCADA systems or Industrial IoT setups often demands specific gateways or middleware capable of translating A-bus communication into standardized formats, like OPC or MQTT, facilitating broader system interoperability.

Security Information

exposure of :8442

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 CyBro A-bus typically arise from the lack of encryption and authentication within protocol exchanges. As many deployments are in industrial control environments, exposed ports can be susceptible to unauthorized access, eavesdropping, replay attacks, or command injection. Attackers gaining access could potentially disrupt or manipulate physical processes controlled by the devices.

Mitigations include:

  • Network segmentation: Restrict access to the automation network using dedicated firewalls or VLANs.
  • Access control: Implement strict ACLs to ensure only known hosts can communicate over port 8442.
  • Protocol isolation: Limit CyBro A-bus traffic to secured, internal networks and avoid exposing it externally.
  • Monitoring and logging: Employ IDS/IPS to detect anomalous traffic patterns on this port.
  • Future-proofing: Where possible, employ gateway solutions that add authentication and encryption layers on top of CyBro A-bus communications.

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risk mix of the 8 listed

  • caution100%

0 of 8 encrypted