The 8 largest information security breaches: Epsilon, 2011

We all like to think that the correspondence we send each other and the information we allow service providers to hold about us is kept between the people involved, which is why it was a shock to many when it was discovered that there had been an internet security breach at Epsilon in 2011.

What happened?

In March 2011, Epsilon, a marketing firm based in Texas, revealed that databases holding information of approximately 50 of its clients, including seven Fortune 500 companies at the time, had been appropriated by cybercriminals.

How many records were accessed?

The exact number of records accessed in this information security breach is unknown, but it is thought to be somewhere in the region of 60 and 250 million.

Records accessed included the email addresses of around 60 million companies, which included big names such as Best Buy, Capital One, and Verizon.

How it happened?

The Epsilon security breach was set into motion when an employee working for the company received a phishing email. Unfortunately for all involved, that employee clicked on a dodgy link, which cybercriminals then used to access the employee’s credentials.

Once they had these credentials, they were able to gain access to the company’s databases, which they used to obtain not only email addresses, but the names and addresses of many of Epsilon’s clients.

What’s happened since?

This breach highlighted how easy it can be for cybercriminals to gain access to corporate databases. Since the breach was discovered, many companies, including big retailers, have come to understand that the data they collect from their customers can be breached at any time once it leaves them. This has led to these companies taking more of an interest in securing information as a direct result of this unfortunate event.

Our accreditations & Partners

  • REC Member
  • VTC - Virtual Technology Cluster
  • RANT Events
  • Bloom Nepro
  • YPO
  • Crown Commerical Service
  • Disability Confident
  • ISO 9001
  • Armed Force Covenant
  • Cyber Essentials Plus
  • ISO 27001





Thank you for signing up to the acumin alerts.

Send CV

Send us your CV and have our recruiters match you to the ideal opportunities

Do you already have an account with us?

Log in

Want to have an account with us?


Want to just send us your CV?

Upload only doc, docx, odt, pdf format file.

By submitting your registration and CV to us you are agreeing to join our database and to be contacted about relevant jobs industry communications. Please read our terms of business for more information.

Password reset

If you need a reminder for your password, fill out the field below

Log in

Access your account to edit your contact details, job alerts or to upload a new CV

Thank you


Thank you for successfully uploading your CV.

Acumin Alerts


Thanks for registering for Acumin alerts.

Acumin Alerts

Unfortunately your CV could not be uploaded

Please make sure your CV is one of the following file types: doc, docx, odt, pdf, rtf

Acumin Spam

Unfortunately your submission has been declared spam. Please try again.



Thank you for submitting your vacancy.


Create an account to register your contact details, sign up for job alerts and upload your CV


Thanks for registering for Acumin alerts. To get the most out of Acumin's service why not register with us?

Upload only doc, docx, odt, pdf format file.
- Practitioner
- Commercial

I agree to the terms and conditions and to be contacted by recruiters:

I agree to receive marketing communications relevant to my job search:

I agree to receive Jobs By Email for the following professions:
- Business Continuity Management
- Counter Fraud
- Cyber Security
- Executive Management
- Governance & Compliance
- Information Security & Risk Management
- Penetration Testing & Digital Forensics
- Sales and Marketing
- Sales Engineering
- Security Management
- Technical Security
- Information/Risk Assurance
- Identity Management
- Application Security
- Security Architecture
- Dev/Sec Ops
- DV & SC Cleared Jobs
- Programme & Project Management

Submit a Vacancy

Use the form below to submit a vacancy