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Port 4840 Details
known port assignments and vulnerabilities
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| Port(s) |
Protocol |
Service |
Details |
Source |
| 4840 |
tcp |
applications |
Unspecified vulnerability in the server in Certec EDV atvise before 2.1 allows remote attackers to cause a denial of service (daemon crash) via crafted requests to TCP port 4840.
References: [CVE-2011-4873], [BID-51553]
An XXE vulnerability has been identified in OPC Foundation UA .NET Sample Code before 2017-03-21 and Local Discovery Server (LDS) before 1.03.367. Among the affected products are Siemens SIMATIC PCS7 (All versions V8.1 and earlier), SIMATIC WinCC (All versions < V7.4 SP1), SIMATIC WinCC Runtime Professional (All versions < V14 SP1), SIMATIC NET PC Software, and SIMATIC IT Production Suite. By sending specially crafted packets to the OPC Discovery Server at port 4840/tcp, an attacker might cause the system to access various resources chosen by the attacker.
References: [CVE-2017-12069], [BID-100559]
A vulnerability has been identified in SIMATIC CP443-1 OPC UA (All versions), SIMATIC ET 200 Open Controller CPU 1515SP PC2 (All versions), SIMATIC IPC DiagMonitor (All versions), SIMATIC NET PC Software (All versions), SIMATIC RF188C (All versions), SIMATIC RF600R (All versions), SIMATIC S7-1500 CPU family (All versions >= V2.5), SIMATIC S7-1500 Software Controller (All versions >= V2.5), SIMATIC WinCC OA (All versions < V3.15-P018), SIMATIC WinCC Runtime Advanced (All versions), SIMATIC WinCC Runtime Comfort (All versions), SIMATIC WinCC Runtime HSP Comfort (All versions), SIMATIC WinCC Runtime Mobile (All versions), SINEC-NMS (All versions), SINEMA Server (All versions), SINUMERIK OPC UA Server (All versions < V2.1), TeleControl Server Basic (All versions). Specially crafted network packets sent to affected devices on port 4840/tcp could allow an unauthenticated remote attacker to cause a Denial-of-Service condition of the OPC communication or crash the device. The security vulnerability could be exploited by an attacker with network access to the affected systems. Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise availability of the OPC communication. At the time of advisory publication no public exploitation of this security vulnerability was known.
References: [CVE-2019-6575]
OPC UA Connection Protocol (IANA registered) |
SG
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| 4840 |
udp |
opcua-udp |
OPC UA Multicast Datagram Protocol (IANA registered) |
SG
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| 4840 |
tcp |
opcua-tcp |
OPC UA Connection Protocol, modified: 2018-01-04 |
IANA
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| 4840 |
udp |
opcua-udp |
OPC UA Multicast Datagram Protocol, registered 2006-09, modified: 2018-01-04 |
IANA
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4 records found
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Related ports: 4843
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External Resources
SANS ISC: port 4840
Notes:
Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify
a specific process, or network service. IANA is responsible for internet protocol resources, including the registration of commonly
used port numbers for well-known internet services.
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.
TCP ports use the Transmission Control Protocol, the most commonly used protocol
on the Internet and any TCP/IP network. TCP enables two hosts
to establish a connection and exchange streams of data. TCP guarantees delivery of data
and that packets will be delivered in the same order in which they were sent.
Guaranteed communication/delivery is the key difference between TCP and UDP.
UDP ports use the Datagram Protocol. Like TCP, UDP is used in combination with IP (the Internet Protocol)
and facilitates the transmission of datagrams from one computer to applications on another computer,
but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received
the message to process any errors and verify correct delivery. UDP is often used with time-sensitive
applications, such as audio/video streaming and realtime gaming, where dropping some packets is preferable to waiting for delayed data.
When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them.
This can be accomplished in both Windows command prompt and Linux variants using the "netstat -aon" command.
We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software.
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