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The three major security threats to a wireless network are loss of confidentiality, loss of integrity, and loss of availability. This framework describes what an attack can affect—not a definitive list or ranking of every Wi-Fi threat. Eavesdropping, rogue access points, and denial-of-service attacks are examples of ways those outcomes can occur.
1. Confidentiality: eavesdropping and exposure
Wi-Fi carries data over radio waves, so someone within range may be able to observe network traffic. If that traffic is unencrypted, its contents may be readable. Encryption used by websites and apps can protect content in transit, but it does not make a connection anonymous: observers may still infer information from metadata such as IP addresses, domains, or the services being used.
This does not mean every public Wi-Fi connection exposes passwords. The risk depends on the network, the security of the connection, and the services you use. NIST’s legacy guide to IEEE 802.11 wireless networks explains foundational WLAN security risks; its detailed discussion should not be read as a measure of how common those risks are today. For current user guidance, NIST’s Mobile Threat Catalogue advises against using untrusted or unencrypted Wi-Fi for sensitive services.
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Integrity means that data and communications remain accurate and are not improperly changed. A rogue access point (AP)—one that impersonates a legitimate network or is otherwise unauthorized—can place an attacker between a device and its intended destination. From that position, the attacker may be able to intercept or alter traffic, depending on the circumstances and protections in place. This is one form of a man-in-the-middle attack.
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Joining a public hotspot does not automatically put an attacker between you and every site you visit. The attacker needs a suitable position, a misconfiguration, or an exploitable weakness. When a network’s identity is uncertain, ask venue staff to confirm its official name rather than assuming that a familiar-looking network is legitimate. NIST’s Mobile Threat Catalogue recommends verifying a network’s identity where needed and avoiding untrusted Wi-Fi for sensitive activity.
3. Availability: disruption or denial of service
Availability means that authorized users can access the network when they need it. Wireless service can be degraded or stopped by denial-of-service techniques, including radio interference (jamming) and packet flooding. NIST’s wireless-network security guide describes these as technical routes to disrupting WLAN service and notes that radio-based attacks can be difficult to counter.
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For an ordinary user, a sudden loss of Wi-Fi may have many causes, including equipment or service faults; it does not by itself prove an attack. Network operators can investigate recurring or unexplained disruption through monitoring and appropriate security controls.
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How to reduce wireless network risks
If you use public Wi-Fi
- Avoid untrusted or unencrypted Wi-Fi for sensitive services.
- If you are unsure which network belongs to a venue, verify its name with staff.
- Remember that encryption can protect the contents of a connection without hiding all network metadata.
If you manage a home WLAN
Protecting a wireless network is an ongoing job, not just a matter of buying a router. NIST SP 800-153 says a WLAN’s security depends on how well its components—including client devices, access points, and wireless switches—are secured throughout design, deployment, maintenance, and monitoring. Its guidance dates to February 2012, so use it for the lifecycle principle rather than as a current settings checklist. See NIST SP 800-153.
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If you manage an organization’s network
- Define which access points and users are authorized.
- Secure and monitor WLAN components, and assess the network regularly.
- Consider wireless access control and wireless intrusion detection among the relevant controls; these do not replace a broader security program.
No single router or control can prevent every confidentiality, integrity, or availability threat. The right protections depend on the network’s deployment and the devices and people that use it.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to use the three-part framework
| Security property at risk | Example threat | Useful response |
|---|---|---|
| Confidentiality | Eavesdropping on unencrypted traffic | Avoid untrusted or unencrypted Wi-Fi for sensitive services; secure and monitor WLAN components. |
| Integrity | Rogue AP enabling interception or modification | Verify uncertain network identities; control which APs are authorized and monitor the WLAN. |
| Availability | Jamming or packet flooding that disrupts service | Monitor for disruption and investigate recurring or unexplained outages. |
These categories help identify what could be harmed and guide a response. They are not an exhaustive catalogue of wireless attacks, nor do they establish which threat is most prevalent or severe.
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