Port Blocker
A Port Blocker is a vital computer security component[1] that blocks and prevents open computer ports from being used to compromise laptop, desktop, servers and other computer equipment.
Problem
BadUSB enabled memory sticks can be plugged into a computer's USB port for a few seconds to launch payloads like capturing confidential data, inserting malware, or otherwise preventing normal operation, even when the computer is not connected to a network.[2] Port Blockers can prevent these consequences and juice jacking attacks. They can also provide tamper-evidence that this has been attempted.
Types
Permanent
These are intended to block ports indefinitely and offer tamper-evidence should their removal have been attempted.
Removable by Extraction Key
- USB
Pot Blockers installed in Laptop with Extraction Key
- Network port RJ45[3]
- Media output, including: HDMi, serial and parallel ports.
Cable Locked
These prevent denial-of-service either intentionally or accidentally (e.g. when moving servers).
All these types of port blockers are computer hardware protection mechanisms.
References
- ↑ "What Is Port Security and Why Is It Important?". CrowdSec. 24 Oct 2024. https://www.crowdsec.net/glossary/port-security.
- ↑ "BadUSB Attack Prevention". Kaspersky Lab. 26 February 2026. https://support.kaspersky.com/KESWIN/12.2/en-US/97193.htm.
- ↑ Hartemink, Raymond (2025). "The best method for physically blocking your network port in your laptop". Hart 4 Technology. https://www.hart4technology.nl/en/smart-keeper-rj45/l53c9.
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