What are suspicious ports?

Commonly Abused Ports
  • Port 20,21 – FTP. An outdated and insecure protocol, which utilize no encryption for both data transfer and authentication.
  • Port 22 – SSH. ...
  • Port 23 – Telnet. ...
  • Port 25 – SMTP. ...
  • Port 53 – DNS. ...
  • Port 139 – NetBIOS. ...
  • Ports 80,443 – Used by HTTP and HTTPS. ...
  • Port 445 – SMB.
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What are insecure ports?

Insecure ports mean unnecessary services are listening on the network that either use insecure protocols (for example, lack of encryption) or allow exploitation by default, or by being misconfigured. Even secure open ports can potentially be abused or provide information about the system to attackers.
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What are bad open ports?

Open ports can be dangerous when the service listening on the port is misconfigured, unpatched, vulnerable to exploits, or has poor network security rules.
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Which ports are most vulnerable?

Here are some common vulnerable ports you need to know.
  1. FTP (20, 21) FTP stands for File Transfer Protocol. ...
  2. SSH (22) SSH stands for Secure Shell. ...
  3. SMB (139, 137, 445) SMB stands for Server Message Block. ...
  4. DNS (53) DNS stands for Domain Name System. ...
  5. HTTP / HTTPS (443, 80, 8080, 8443) ...
  6. Telnet (23) ...
  7. SMTP (25) ...
  8. TFTP (69)
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How do I know if a port is secure?

you can use "Keystore Explorer" tool and select Examine> ExamineSSL, and put in your host and port and click OK, if this port on that server is encrypted then it will show the certificate details that the port is using to encrypt data.
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Port Numbers Explained | Cisco CCNA 200-301

Can port 80 be hacked?

A port itself cannot be hacked, rather, it comes down to if the service running on that port contains any vulnerabilities. If you're running a web service on port 80 that contains no known vulnerabilities, your chances of being hacked are low depending on your situation.
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What ports should not be open on my router?

Why are network ports risky?
  • Port 80 for web traffic (HTTP)
  • Ports 20, 21 for File Transfer Protocol (FTP)
  • Port 25 for Simple Mail Transfer Protocol (SMTP)
  • Port 53 for Doman Name System (DNS)
  • Port 110 for Post Office Protocol (POP3)
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What is the easiest port to hack?


TCP port 21 — FTP (File Transfer Protocol) TCP port 22 — SSH (Secure Shell) TCP port 23 — Telnet. TCP port 25 — SMTP (Simple Mail Transfer Protocol)
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How do I defend a port scan?

How To Defend Against Port Scanning
  1. Install a Firewall: A firewall can help prevent unauthorized access to your private network. ...
  2. TCP Wrappers: TCP wrapper can give administrators the flexibility to permit or deny access to the servers based on IP addresses or domain names.
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Is port scanning illegal?

In the U.S., no federal law exists to ban port scanning.
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What can hackers do with open ports?

Malicious ("black hat") hackers commonly use port scanning software to find which ports are "open" (unfiltered) in a given computer, and whether or not an actual service is listening on that port. They can then attempt to exploit potential vulnerabilities in any services they find.
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What does bad port mean?

A bad port would mean it would take a lot more horsepower to run, then it does to run the orginal, without being different. But it also makes it a good port, because it's not any different. So...
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Is it safe to have port 443 open?

HTTPS is secure and is on port 443, while HTTP is unsecured and available on port 80. Information that travels on the port 443 is encrypted using Secure Sockets Layer (SSL) or its new version, Transport Layer Security (TLS) and hence safer.
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Is port 8080 Vulnerable?

The web api server on Port 8080 of ASUS HG100 firmware up to 1.05. 12, which is vulnerable to Slowloris HTTP Denial of Service: an attacker can cause a Denial of Service (DoS) by sending headers very slowly to keep HTTP or HTTPS connections and associated resources alive for a long period of time.
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Why is port 443 open?

If port 443 is open on a computer, that usually means web servers are waiting for a connection from a web browser. You can test whether the port is open by attempting to open an HTTPS connection to the computer using its domain name or IP address.
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Is port 80 a security risk?

However, Port 80 provides an HTTP connection under TCP protocol. This port provides an unencrypted connection between the web browser and the web servers, which leaves the sensitive user data exposed to cybercriminals and may lead to severe data misuse.
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Is port 4444 secure?

It uses this port to eavesdrop on traffic and communications, for its own communications, and to exfiltrate data from the compromised computer. It is also used to download new malicious payloads. Malware such as the Blaster worm and its variants used port 4444 to establish backdoors.
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Is port 23 secure?

Port 23 – Telnet. A predecessor to SSH, is no longer considered secure and is frequently abused by malware.
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What is a port vulnerability?

Vulnerabilities of open ports

As mentioned at the outset, open ports provide a more extensive “attack surface” or opportunity for an attacker to find vulnerabilities, exploits, misconfigurations, and other risks due to the allowed network communication over a specific network port.
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Can malware rename itself?

The virus is smart enough to rename itself and send copies to a different drive or location, evading detection by the system's antivirus software. The only way to remove it is to completely wipe the computer and rebuild it from scratch.
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Why do you block ports?

Port blocking has been in use at various times by both wireline and wireless network operators for over a decade. One of the original and enduring motivations for blocking ports is to prevent network attacks and abuse associated with particular application protocols.
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