8 VoIP Security Risks That Could Compromise Your Sensitive Data

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8 VoIP Security Risks That Could Compromise Your Sensitive Data

Explore eight voice over Internet Protocol security risks that could compromise your sensitive data, including theft of service, identity theft, and more.

· Security Zone ·
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Voice over Internet Protocol (VoIP) has become a staple for businesses and embraced by people looking for a cheaper alternative to traditional phone companies. It’s gone from being something techies used to becoming mainstream. 

It’s also become a target for hackers and thieves. Here are some of the top security risks associated with using VoIP.

Theft of Service

Service theft, also known as phreaking, happens when unscrupulous actors steal credentials and use them to steal service from a provider. It also happens when the service is used by the hacker and the costs for the service are paid by someone else. These freeloaders stick you with the bill while using the service you’re paying for. Once they gain access to your account, they can change calling plans or run up your bill.

Identity Theft

This occurs when a third-party intercepts your data  and steals your credentials. They grab user names and passwords which they can use to log in to your accounts and create havoc. Using this stolen identity, thieves can impersonate you and look for additional victims.

You might also want to read: Predictable Pitfalls of Scaling VoIP to Cluster

VoIP Phishing

VoIP phishing, or Vishing, happens when someone calls you and pretends to be from a reputable organization and requests confidential information.


VoIP users can be at risk of someone eavesdropping on your conversations.

Man in the Middle Attacks

Man in the middle attacks occur most frequently in public Wi-Fi hotspots. A third-party intercepts your communication as it is being transmitted without your knowledge. Calls can be hijacked or sensitive data can be stolen.

Denial of Service (DoS) Attacks

Denial of service attacks overload the network by flooding it with data. This clogs up the bandwidth and prevents calls from connecting. Hackers can get control of systems and take it over.

Voicemail Phishing

Have you ever received a voicemail without your phone ringing? So-called ringless voicemails are becoming more common as telemarketers know fewer people answer calls from unknown numbers. By delivering voicemails direct to carrier inboxes, they can avoid the ring. When bad actors get your credentials or take over your system, they can deliver voicemails to others and pretend to be a trustworthy authority. Think of it as “audio spam.”


Just like computer software, VoIP can be targeted by hackers to inject malware or malicious code. VoIP softphones installed on mobile devices can be vulnerable to malware attacks. Threat actors can inject code that sends spam, destroys information, traces keystrokes, or routes email to a third-party without your knowledge.

Take VoIP Security Seriously

VoIP provides a less expensive alternative to traditional phone service. Businesses that switch often save as much as 50% over their traditional phone costs. VoIP can also provide advanced calling services that aren’t affordable with traditional phone providers. 

However, you need to take security seriously with VoIP. You can’t afford to put your proprietary data and your employees at risk for VoIP fraud.

Protect Your VoIP

If you are using VoIP, you need to be using a Virtual Private Network (VPN) or encryption technology.  VPNs encrypt data. VPNs also mask your IP address making you virtually invisible when connected to public Wi-Fi networks.

Many modern VoIP systems will also provide encryption as part of their cloud solution. Even if the data is intercepted mid-stream, hackers will be unable to decipher it.

Here are a few simple strategies that will help mitigate security threats:

  • Use military-grade encryption to protect your data
  • Require strong passwords on routers, switches, firewall and any device that requires a password
  • Monitor your network and use security alerts
  • Use a VPN
  • Install antivirus software on all devices, including smartphones

Further Reading

Voice Over Internet Protocol (VoIP) For Dummies

How to Protect Dataset Privacy Using Python and Pandas

cyber attacks ,denial of service attacks ,dos attacks ,identity theft ,man in the middle attacks ,security ,vishing ,voicemail phishing ,voip ,voip phishing

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