Netflix’s new series Zero Day paints a terrifyingly plausible scenario: a nationwide cyberattack crippling power grids, communication networks, and critical infrastructure – all triggered by zero-day vulnerabilities. While it makes for gripping television, the reality is that zero-day exploits are already a threat.
Experts from Avast, a Cyber Safety brand of Gen, provide commentary on how realistic Zero Day is, what would actually happen in the event of a real zero-day attack, and the growing role AI plays in cyber threats.
The idea of invisible software flaws might sound scary, but there are many practical steps you can take to reduce your risk from zero-day threats. Cybersecurity is about managing risk and limiting exposure, and even against unknown exploits, the following best practices make a big difference:
Keep your devices and software updated. When vendors release security patches (often in routine updates), install them promptly. Many zero-day attacks only succeed until a fix is available – once patched, the threat is neutralized. Enabling automatic updates on your operating system, applications, and phone ensures you get these critical patches as soon as they come down. Regular updates close the holes that attackers might otherwise use. As the WannaCry example showed, delaying patches can leave you vulnerable to an exploit that’s already been solved.
Use reputable security software. A good security solution can sometimes detect suspicious behavior even from new, unknown threats. Modern security software doesn’t rely solely on known virus signatures; it also looks at what programs are doing (heuristics and behavior analysis). While it may not catch every zero-day, it adds an extra layer of defense that could stop or contain an attack. Make sure your security software stays up to date so it can recognize the latest threats. Additionally, consider using a firewall (many operating systems include one by default) to block unauthorized connections, which can help limit the damage if some malware does get in.
Beware of phishing – think before you click. Phishing is one of the most common ways attackers deliver exploits. A convincing scam email might lure you to a malicious website that quietly uses a zero-day to infect your computer or get you to install a “document” that is actually malware. Always examine emails and texts critically: check the sender’s address, look for signs of hoaxes or urgency, and verify via other means if you get an odd request (like a supplier asking you to install an update or a “bank” emailing for login info). When in doubt, don’t click the link. This caution helps because even if a zero-day is involved, it often needs that initial hook to get to you.
Practice good cybersecurity hygiene. Many zero-day exploits still require some action to reach you – for instance, convincing you to open a file, click a link, or plug in an infected device. By staying vigilant with your online habits, you can avoid falling into those traps. This means: Don’t download attachments or software from untrusted or unknown sources. Be wary of unexpected emails or messages, especially those urging you to run macros or enable content in documents. Use strong, unique passwords (and a password manager) so that if one account is compromised it doesn’t unlock everything. And always enable 2 Factor Authentication (2FA) whenever is possible. Good habits act like a safety net, catching a lot of threats before they can ever execute, whether zero-day or not.
Backup your data regularly. This won’t prevent an attack, but it can save you if the worst happens. If a zero-day powered ransomware or wiper malware strikes, having recent backups of your important files (and storing them offline or in a secure cloud service) means you can restore your system without paying ransom or losing everything. Test your backups occasionally to ensure they work. It’s a last-resort measure, but an essential part of resilience.
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