Law firms handle highly sensitive client information every day. From mergers and acquisitions to intellectual property and criminal defence, your files contain a goldmine for cybercriminals.

With 9,100 law firms in England and Wales, there were 954 successful cyber incidents in 2023–24. That means roughly 10.5% of UK law firms were attacked in a single year, highlighting the sector’s vulnerability to increasingly sophisticated cyber threats.

Below are the top four cyber threats law firms need to understand in 2025, and practical steps to protect your firm.

Ransomware attacks

• Ransomware remains a huge problem for law firms. These attacks lock your files and demand payment for their release, often with the added threat of leaking sensitive case data.
• Between 2023 and 2024, ransomware attacks on UK law firms increased by 77%, with over 60% of incidents involving ransomware, with average ransom demands now exceeding £89,000.
• The rise of Ransomware-as-a-Service (RaaS) has lowered the barrier for cybercriminals, contributing to a 340% increase in ransomware attacks targeting legal professionals (Quiss).

How can you stay protected?

• Implement regular, offline backups of all critical data.
• Keep software and security patches up to date.
• Use multi-factor authentication (MFA) and restrict access to sensitive files.
• Train staff to recognise phishing attempts and suspicious links.

Insider Threats & Stolen Credentials

• Internal threats, intentional or accidental, remain a major challenge for many law firms.
• A survey of 5140 UK law firms found 72.2% had at least one leaked username and password on the dark web, averaging 195 stolen credentials per firm (Legal Insider).
• Insider-related breaches caused 60% of data breaches, compromising information of roughly 4.2 million people, or around 6% of the population (NetDocuments).

How to protect your firm:

• Conduct regular access reviews to ensure only authorised team members can access your sensitive data.
• Use identity and access management (IAM) to enforce strong authentication policies at your law firm.
• Provide ongoing cybersecurity awareness training to staff, practicing good password hygiene, best practices and awareness of phishing scams.

Exploits of Third-Party Systems & AI-Enhanced Attacks

Law firms are highly exposed to risks from external vendors, software, and AI-driven attacks.

• The UK legal sector saw a 39% increase in data breaches linked to third-party systems (NetDocuments).
• Human error, as always, remains a major factor, with 95% of cyberattacks succeeding due to mistakes, and 66% of UK CISOs citing human error as the top vulnerability (SCMedia).
• AI is being weaponised through deepfake audio, highly convincing phishing emails, and automated reconnaissance, bypassing traditional security measures.

How to Protect Your Firm:

• Vet and monitor third-party vendors for cybersecurity compliance.
• Implement AI detection tools and advanced email filters.
• Maintain strong endpoint protection across all devices.

Supply Chain & Outsourced Legal Tech Attacks (New for 2025)

62% of data breaches are linked to third-party suppliers, underlining the importance of robust third-party risk management (Risk Ledger).

How to Protect Your Firm:

• Rigorous due diligence on vendors
• Contractual cybersecurity requirements
• Require certifications and monitor vendor systems
• Network segmentation to limit breach impact

The Solution: Cyber Essentials Certification

Cyber Essentials is a UK government-backed certification that helps organisations defend against common cyber threats.

Implementing the five key controls, firewalls, secure configuration, access control, malware protection, and patch management, can:

• Reduce exposure to ransomware
• Block most phishing and business email compromise attempts
• Strengthen defences against compromised suppliers or software
• Firms that achieve Cyber Essentials certification reduce their risk of attack by 80% and file 92% fewer cyber insurance claims (NCSC).

RedDoor IT:

We work around the clock to secure our clients’ IT and cybersecurity infrastructure, including guiding law firms through Cyber Essentials certification.

Why us?

• A 4.9* average review rating over 65+ Google reviews from satisfied clients
• Experience helping firms like Osborn Knight and HJL Solicitors achieve certification
• A free vulnerability scan (worth £495) to identify weaknesses before attackers do

The financial, reputational, and operational costs of a successful cyber-attack far outweigh the investment in prevention.

Don’t wait for a breach, take control of your cybersecurity today.