List of data breaches and cyber attacks in October 2021 – 51.2 million records breached

In October, we discovered 94 publicly disclosed cyber security incidents, accounting for 51,248,331 breached records.

The majority of those records came from a cyber attack in which a hacker accessed Argentina’s government ID database, with every citizen of the country thought to be affected.

However, there are plenty of other incidents to dig into, including a raft of ransomware attacks against the education sector.

You can take a look at our full list below, with incidents affecting UK organisations listed in bold.

And don’t forget to check out our Q3 2021 data breaches and cyber attacks quarterly review, in which we take a closer look at the information gathered in our monthly lists.

Cyber attacks

If you find yourself facing a cyber security disaster, IT Governance is here to help. Our Cyber Incident Response service provides the help you need to deal with the threat, as our experts guide you through the recovery process.

They’ll review the breach, mitigate the damage and ensure that you are up and running again as soon as possible.


32% of data breaches involved phishing.

Data breaches

Financial information

Malicious insiders and miscellaneous incidents

In other news…

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