Bring-your-own-device programs have grown fast in recent years. A 2022 survey showed that over 60% of organizations allow personal devices for work tasks.

This trend highlights the many benefits of BYOD. Workers stay productive on mobile devices they already know. Companies reduce hardware expenses and expand remote work options.

Still, BYOD security issues are on the rise. Experts warn of data theft, malware infections, and other risks. These dangers of BYOD can disrupt operations and leak sensitive data. Security measures are essential when users connect BYOD devices to a company network.

Below, we look at 12 BYOD security risks and show how to mitigate them. We also share how NordLayer supports secure bring your own device initiatives with modern tools.

What does BYOD mean for modern security?

BYOD means employees use personal devices for work tasks. These devices might be smartphones, tablets, or laptops. Many companies find that this flexibility improves morale and cuts costs. Yet the convenience also brings security threats.

When people use their own hardware, administrators lose some control. Different operating systems and software versions complicate oversight.

Without a strong BYOD security policy, BYOD vulnerabilities grow. BYOD cybersecurity threats can include malicious apps, outdated software, and easy entry points for attackers. The result can be serious data loss or system disruptions.

Robust mobile device management is critical to avoid major BYOD attacks. IT teams must adopt device security tools, enforce security measures, and monitor network access. Without those steps, the risks of BYOD can quickly outweigh its benefits.

Main BYOD security risks and how to mitigate them

Effective BYOD security starts with understanding common risks employees face daily. Companies often overlook simple issues like weak passwords, making data breaches more likely. The following section covers these risks clearly and suggests easy-to-follow strategies for reducing threats. Implementing these steps strengthens your organization’s overall BYOD security.

1. Weak passwords

Weak credentials present a huge problem. Microsoft identified 44 million accounts using passwords leaked in prior breaches​. Personal and corporate data become easy targets when employees reuse simple passphrases.

Solution: Enforcing strong password policies (length, complexity, non-reuse) and multi-factor authentication (MFA) dramatically lowers risk: according to one report, MFA can block over 99.9% of account compromise attacks.

Use MFA for all logins. Require complex passwords of at least 12 characters. Encourage passphrases instead of short strings and try to use cybersecurity tools with integrated password managers.

2. Unsecured Wi-Fi networks

Open hotspots let attackers spy on private sessions. BYOD users often connect to coffee shop or airport Wi-Fi. Security risks skyrocket when employees using public Wi-Fi handle sensitive data on unprotected networks.

Solution: Train staff to avoid connecting to unknown or open Wi-Fi without protection. Encrypt internet connections using a secure VPN. This protects personal devices and helps reduce BYOD threats and vulnerabilities tied to unsafe networks.

3. Outdated operating systems

Old software invites security threats. Many personal device owners skip updates or disable auto-patching. Attackers exploit these gaps to launch BYOD attacks that target known flaws.

Solution: Push frequent updates across all BYOD devices. Enable automatic installs for operating systems, apps, and drivers. An enterprise browser can offer centralized control. Also, NordLayer’s Device Posture Security helps ensure compliance by restricting network access for devices that miss patches. This prevents out-of-date systems from weakening the organization’s defenses.

4. Malicious apps

Employees install apps for fun, productivity, or convenience. Some mobile apps harbor hidden malware. These malicious apps can harvest corporate data or disrupt device security.

Solution: Use mobile device management tools to monitor installed apps. Block high-risk apps and encourage staff to download from trusted sources. It will help reduce BYOD security risks by catching harmful software quickly.

5. Weak access controls

Weak role management grants users more privileges than they need. This raises the likelihood of accidental company data theft. If attackers seize one account, they may roam across systems containing sensitive data.

Solution: Adopt Zero-Trust principles. Segment company data and restrict resource access. Cloud firewalls allow granular permission control, which seals off critical assets. They help limit lateral movement and reduce the impact of compromised credentials.

6. Data leaks from personal storage

Workers often save company data on personal devices. Some even sync files to personal cloud storage without encryption. These habits expose BYOD security threats and heighten security concerns.

Solution: Enforce encryption of all work files stored on personal devices. Provide secure containers for personal and corporate data. Pair your cybersecurity tool with data loss prevention (DLP) software to protect data at rest and in transit. This step lowers the risk of data loss on unregulated storage sites.

7. Lost or stolen devices

Device theft is a growing concern. More than 70 million mobile devices are lost or stolen each year worldwide. This can lead to unauthorized access if the phone holds unencrypted work data.

The loss of a BYOD device can expose any data stored on it, as well as provide a potential “way in” for attackers if the device isn’t secured. A famous example is the Lifespan Health System in the U.S. which was fined $1.04 million after an unencrypted stolen laptop led to a breach of over 20,000 patients’ data.

Solution: Activate remote wipe features and strong passcode locks. Mandate immediate reporting of missing devices to IT. Quick actions can prevent major company data loss in these scenarios.

8. Shadow IT

Shadow IT arises when employees use unapproved tools or services. This might include personal messaging apps or unknown file-sharing platforms. Such unregulated usage adds security issues with BYOD and creates hidden vulnerabilities.

Solution: Create a clear BYOD security policy that addresses software usage. Educate staff about the dangers of unvetted platforms. Using an enterprise browser can also help by blocking unknown tools. Early detection keeps shadow IT from spiraling into serious BYOD security threats.

9. Social engineering attacks

Phishing and other social tricks fool people into giving up login details. Attackers often send convincing emails or messages that seem legitimate. The presence of personal devices increases this risk, since users may mix personal and work data.

Solution: Train employees to verify messages and avoid clicking unknown links. Enable spam filters and real-time domain checks. NordLayer helps block known malicious domains to stop such attacks in their tracks. But ongoing user awareness remains essential for mitigating social engineering.

10. Lack of device monitoring

Some organizations fail to track what happens on personal devices. If suspicious activity goes unseen, it can lead to larger security issues with BYOD. Attackers thrive when no one notices unusual file transfers or logins.

Solution: Deploy monitoring tools that watch for anomalies. Review logs for off-hours data transfers and repeated login failures. Many tools offer centralized oversight across multiple endpoints. Quick alerts let IT teams respond before small issues become big incidents.

11. Poor network segmentation

When every device joins the same subnet, BYOD vulnerabilities expand. One compromised device might endanger the entire corporate data set. This setup can make BYOD security threats harder to contain.

Solution: Segment networks based on role and device type. Isolate guest networks from core servers. NordLayer’s network protection platform supports micro-segmentation. This reduces the impact of a single compromised device by limiting lateral movement.

12. Incomplete offboarding

Employees may leave without losing access to corporate systems. Their accounts stay active on personal devices long after their last day. This creates ongoing BYOD security concerns, even after roles change.

For example, a former Cisco engineer has admitted to illegally accessing Cisco’s network and wiping 456 virtual machines as well as causing disruption to over 16,000 Webex Teams accounts. US prosecutors say that the tech giant needed to pay $1.4 million in additional employee time to restore and rectify the damage caused to the system, as well as issue refunds of approximately $1 million to customers impacted by the network issues.

Solution: Implement strict offboarding protocols. Revoke credentials, disable accounts, and wipe relevant apps on departure. NordLayer simplifies user management from a single dashboard. This cuts the risk of lingering access and potential data theft down the road.

Securing BYOD with NordLayer

BYOD boosts flexibility but increases security risks. NordLayer protects both personal and company devices, ensuring safe access.

Our network protection platform combines internet security, network access control, and secure connections. Your network stays safe, no matter where employees work.

Business VPN encrypts traffic and supports shared or private gateways with dedicated IPs. With 30+ global locations, teams get fast, secure access.

The platform also helps block malicious sites, risky downloads, and unwanted traffic while keeping data encrypted in transit at all times.

With Zero Trust access controls, only verified users and devices can connect. Security policies ensure only compliant devices access company resources.

NordLayer’s Enterprise Browser will add extra protection for SaaS and web apps. It blocks malicious redirects, restricts user input, and enforces security policies. It supports both managed and unmanaged (BYOD) devices, ensuring only trusted users access sensitive resources.

NordLayer’s tools make BYOD safer, but security requires regular updates, security testing, and strong authentication. Combine VPN, ZTNA, and the Enterprise Browser, and embrace BYOD with less security risks.

Businesses rely on emails to run teams smoothly, communicate with customers, and keep managers in the loop. But what if emails go rogue? Could the next email you open infect your network with ransomware or spyware agents?

Sadly, the answer is yes. A single email can compromise an entire business network. Clicking attachments or following fake links can lead to identity theft attacks, malware infestations, data loss, and, eventually, financial damage.

Email security is a critical concern for every business. Let’s cut through the myths surrounding email phishing attacks. This article will explain everything you need to know and suggest relevant security responses.

The hidden threats linked to malicious emails

Countering email security threats demands a calm, methodical approach. Threat management starts with understanding how opening a phishing email can affect your network.

Previously, companies could easily suffer malware infection by opening a suspicious email. Mail clients lacked protection against Javascript attacks, allowing criminals to access user devices directly.

Fortunately, today’s webmail systems are more robust. It’s hard to acquire an email virus simply by opening a message. Virus scanners screen incoming mail before users click, flagging potential threats and avoiding one-click infections.

The bad news is that email security has gone underground. Attackers use subtle methods to persuade users to take risky actions. And they often succeed. Criminals could conceal a malicious payload inside a seemingly innocent email attachment. Or they could redirect readers to unprotected websites.

That’s why we call attachments “hidden threats.” Criminals use deception to create false trust. Targets need to remain vigilant and question every email they receive. Understanding what to look for is critically important.

The most common types of malicious email attachments

Attackers can attach almost any file type to a phishing email. However, not all file types carry the same threat level. Some are harder to detect than others. Let’s run through some common email phishing attacks and explain how they work.

Executable files: The most dangerous attachments

Executable file extensions like .bat, .exe, .com, and .bin are at the top of the email phishing food chain. They should be your top priority when designing email security strategies.

The reason is that executable files automatically launch code when users open them. There are no intermediate steps or additional user actions. Malware executes, embeds itself on the victim’s device, and starts to spread. The user often does not know that the attack is underway.

Executables also routinely evade email security filters, appearing legitimate to casual readers. But one click can lead to severe security consequences.

Infected documents and PDFs

Office documents (such as docx, doc, .xls, or .xlsx) are also attractive vectors for phishing email attacks, but for a slightly different reason. Attackers can seed documents with malicious scripts or macros.

Normally, macros are tools that save time and automate complex processes. However, criminals can use them to execute malware inside applications.

Using documents has some critical advantages. Spreadsheets, PDFs, or Word files are familiar to office workers. Employees might mistake malicious attachments for client contracts, invoices, or strategic documents.

Attackers also improve their chances of success via urgent language. Emails urge recipients to open the document or risk damaging consequences. That’s all superficial. The real consequences materialize after the malicious macro executes.

PDFs play a similar role. In this case, attackers can seed documents with Javascript scripts. However, PDFs have another benefit: attackers can embed links within the PDF attachment, sending targets to fake websites where criminals harvest personal information.

Hidden malware in compressed files

Compressed file formats include .rar and .zip extensions. We commonly use both formats to transfer large files efficiently, but both file formats can become threat vectors.

Compressed files could hold anything. Without opening the file, recipients have no idea whether the content is legitimate or malicious. Intelligent attackers disguise compressed formats as valuable documents or applications, the kind of files targets may need to open. When they do so, the malware executes automatically.

Archives have another benefit: attackers can add password protection. Password protection blocks antivirus software and suggests to victims that the file is authentic – even if that is far from true.

File extension tricks attackers use

Another thing to remember is that appearances are often deceptive when dealing with email attachments. Attackers can use file masking to disguise the nature of attachments and make identifying them harder.

Images and video files are common examples. Recipients may think the attachment is a standard .jpg image. Clever attackers link the image to the target’s personal or professional life. It could be a real estate portfolio or a product listing – at least on the surface. However, a malicious executable lies beneath the surface.

Why deceptive emails fool even careful employees

There are many ways to deceive targets with a phishing email, from PDFs to camouflaged images. But here’s the critical point: any employee can open a suspicious email or download an attachment they should avoid. Nobody is immune. That’s why phishing is such a persistent security issue.

Phishers play on human nature. They mimic legitimate communications from trusted entities, like banks or corporate partners we deal with daily. They prompt rash actions by using an urgent tone and creating false fears. And they use techniques like spoofing and masking to create a veneer of authenticity.

The most sophisticated phishers take these techniques even further. They research their victims and adopt familiar styles of address. They leverage personal information purchased on the Dark Web to profile targets and fine-tune their email content.

Drive-by downloads heighten risks still further. These downloads occur almost invisibly. Victims visit compromised websites via links that appear innocent. No amount of cybersecurity training can prevent infections that occur in the background, without any initial symptoms.

Email security: Preventing hacks and viruses

Hidden threats and devious phishing attacks may seem intimidating but don’t panic. While you could get hacked by clicking a single email, you probably won’t if you adopt email security best practices.

Adopt a strict policy on opening attachments

Treat all email attachments as suspicious by default unless you have requested the file. This policy applies even to attachments from colleagues or trusted partners.

If you receive an unrequested attachment, don’t open it. Ask the sender for verification that the attachment is genuine and what it contains.

Update your PDF reader

PDF attachments are far more dangerous if your reader is out of date. Attackers leverage exploits in older versions while developers plug security gaps with each iteration. Update your reader regularly, preferably as soon as new versions become available.

If possible, upgrade to more secure PDF software. Sophisticated readers include sandboxing to contain potential threats and file validation to screen for malware.

Patch your browser and email client

The same applies to updating your web browser and email application (if you use one). Any web-facing tool may contain exploits or backdoors for malware infection. Regular updates neutralize recently identified vulnerabilities.

Scan emails for viruses and malware

Don’t rely on security tools provided by email services. Scan every incoming attachment with dependable antivirus software that leverages global threat databases. Robust antivirus defenses defend your network edge when other systems fail. Your wider network should remain safe, even if you click on a dangerous file.

Understand how to identify phishing links

Remember: attachments aren’t the only email security threat. Clicking a phishing link can also lead to malware infection or the exposure of personal information. Training employees to avoid fake websites is critically important.

Fake links tend to have convincing anchor text but deceptive URLs. For instance, URLs contain subtle deviations from legitimate versions. Fake websites also tend to contain errors or factual mistakes (such as false tax numbers).

How can NordLayer help

Companies are not alone when dealing with malicious attachments and links. NordLayer’s expertise can help you screen every email before cyber-attacks occur.

Our Download Protection scans every attachment automatically using advanced NordVPN Threat Protection technology. Our solution detects and removes malware instantly before it infects your system. It also gives you an overview of scanned files and allows you to track malicious activity.

Download Protection integrates seamlessly with other NordLayer security tools, adding another essential line of defense.

NordLayer’s Web Protection safeguards your business by blocking access to scam, phishing, and malicious websites. If a user inadvertently clicks on a phishing link, our system will intercept and prevent the connection, protecting your organization from potential security threats.

Ease your email attachment anxiety. Contact the NordLayer team and book a demo to find a security solution for your team.

Frequently asked questions

Can you get a virus from opening an email?

Yes. Malware can execute directly from an email via malicious scripts. However, this is unlikely with proper security measures. Infection via attachments and malicious links is much more common.

Is it safe to reply to an unknown email?

Yes, but you should always exercise caution. Phishers may engage you in conversation to build trust and deliver malware. Ask senders to verify their identities before proceeding. If they cannot do this, end the conversation and report the phishing email.

Never open attachments from unknown senders, and avoid following links in emails from strange contacts. Always ask who has sent the message, what they want, and whether they are who they claim to be.

What to do if you click on a phishing link?

Firstly, don’t panic. If a download prompt appears, decline the transfer. Don’t interact with any forms or links on the phishing website. Leave the site as quickly as possible.

To be safe, disconnect your device from the internet and run a system scan. You may want to change critical passwords (a good security practice anyway). And report the fake website to Google.