Hackers and cyber criminals are continuously searching for vulnerabilities in software and systems to exploit for their own malicious gains.
What are Zero-Day Vulnerabilities
Zero-day vulnerabilities refer to software flaws or weaknesses that are unknown to the software vendor and, consequently, unpatched at the time of discovery by cyber criminals. These vulnerabilities are security holes that malicious threat actors (hackers) can exploit to gain unauthorised access to systems, steal sensitive information, disrupt services, or execute malicious code.
The term 'zero-day' signifies that software developers have zero days to respond to the vulnerability before cyber criminals potentially exploit it. Once a zero-day vulnerability is exploited, it becomes known to the software vendor, and they can begin developing a security patch or update to fix the flaw.
The Dangers of Zero-Day Vulnerabilities
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Undetectable Attacks: Since zero-day vulnerabilities are unknown to the software vendor, they lack the necessary security measures to detect or prevent such attacks. Cybercriminals can infiltrate systems undetected, increasing the potential for data breaches and compromising privacy.
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Targeted Exploitation: Zero-day vulnerabilities are highly sought after by skilled hackers and state-sponsored cyber espionage groups. These sophisticated attackers can exploit the vulnerabilities for targeted attacks against specific organizations or individuals, amplifying the potential damage.
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Expanding Attack Surface: With the increasing interconnectedness of devices and the rise of the Internet of Things (IoT), the attack surface for zero-day vulnerabilities is expanding rapidly. From smartphones and laptops to smart home devices and critical infrastructure, any system connected to the internet can be susceptible to such attacks.
The Importance of Updates
Software updates play a pivotal role in countering the risks posed by zero-day vulnerabilities. Here's why regular updates are crucial:
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Patching Vulnerabilities: Updates often contain security patches that address known vulnerabilities, including zero-day exploits. By promptly installing updates, users ensure that the latest protections are in place, reducing the likelihood of successful attacks.
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Enhanced Security Measures: Updates not only patch vulnerabilities but also improve overall security measures. Developers continually refine their software to strengthen defenses against emerging threats, ensuring users have access to the most robust security features available.
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Stay Ahead of Cyber Criminals: Software vendors constantly monitor and analyze threats to identify vulnerabilities. Regular updates allow vendors to respond swiftly to emerging risks, closing security gaps before cybercriminals can take advantage of them.
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Protecting Personal Data: Updating software helps protect sensitive information, including personal data, financial details, and login credentials. Neglecting updates could expose users to identity theft, financial fraud, and other forms of cybercrime.
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Maintaining System Stability: Updates not only address security concerns but also improve system performance and stability. Regular updates ensure that software operates efficiently, reducing the risk of crashes, freezes, or other malfunctions that could be exploited by attackers.
Important information for schools: you may need to check with your IT provider that they are regularly updating your network and systems as part of their regular maintenance routines. Ensure you have allowed enough time for them to do this each week.
Microsoft Patch Tuesday
Microsoft fixes three zero-days in May 2023 Patch Tuesday
Cyber Checks
Complete our Information/Cyber Security Checklist to get a graphical (RAG) view of where your organisation is with Cyber Security.
Further information about zero-day vulnerabilities can be found here: NCSC Understanding Vulnerabilities.
What to do in the event of a cyber attack
First, follow your cyber response plan. Record the incident in your internal incident log, inform your governing board or trustees, and contact your Data Protection Officer (DPO) as soon as possible if personal data could be involved.
Incidents or attacks where a security breach may have taken place, or other damage was caused, should also be reported to an external body. The SLT digital lead is responsible for assigning someone to report any suspicious cyber incidents or attacks. This person will need to report to:
- Report Fraud, which replaced Action Fraud in December 2025, on 0300 123 2040 or through the Report Fraud website. Make sure it is recorded as a crime report so that you receive a crime reference number.
- the DfE sector cyber team at This email address is being protected from spambots. You need JavaScript enabled to view it.
You may also need to report to:
- the National Cyber Security Centre (NCSC) if the incident or attack causes long-term school closure, the closure of more than one school, or serious financial damage. If you're not sure who to report to, use the government's cyber incident signposting service.
- the Information Commissioner's Office (ICO) within 72 hours of becoming aware of a personal data breach, unless the breach is unlikely to result in a risk to people's rights and freedoms. If the risk is high, you must also tell the people affected without undue delay. Your DPO can help you assess this. We will do this on behalf of DPE customers.
- the Risk Protection Arrangement (RPA) emergency assistance helpline on 0800 368 6378 or This email address is being protected from spambots. You need JavaScript enabled to view it., if you are an RPA member, or your cyber insurance provider if you have one
- your local police force if you suspect a safeguarding impact
- any third-party service providers whose systems are affected, so they can be part of a coordinated response
- Jisc CSIRT, if you are part of a further education institution.
You must act in accordance with:
Preserve the evidence
Police investigations may find out whether any compromised data has been published or sold, and identify the perpetrator. Preserving evidence is as important as recovering from the crime. Keep a clear record of what happened, when, and what actions you took. The DfE's guidance on record keeping in an incident explains what to capture.
Reporting suspicious emails and texts
Forward suspicious emails to This email address is being protected from spambots. You need JavaScript enabled to view it.. Report scam text messages by forwarding the original message to 7726 (it spells SPAM on the keypad).