Directorate Change

10 March 2020

Corero Network Security plc

("Corero" or the "Company")

Directorate Change

Corero Network Security plc (AIM: CNS) announces that Andrew Miller has tendered his resignation to the board of directors. Andrew will therefore step down from his role as Chief Financial Officer in the coming months to take up a position with a private equity business, at which time he will be take up the role of Non-executive Director of Corero.

As a result, the Board will now commence a process to identify and appoint a successor and further announcements will be made, as appropriate, in due course.

Jens Montanana, Corero Chairman, said:

"Andrew has been a valued member of our management team as CFO since 2010 and has made a significant contribution to the business. I would like to thank him on behalf of the board for his dedicated service.

"I am however pleased to confirm that we will continue to benefit from Andrew's expertise as a non-executive director of Corero once his executive duties end and I look forward to providing an update on the appointment of a CFO in due course."

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About Corero Network Security

Corero Network Security is a leader in real-time, high-performance DDoS defense solutions. Service providers, hosting providers and digital enterprises rely on Corero's award winning technology to eliminate the DDoS threat to their environment through automatic attack detection and mitigation, coupled with complete network visibility, analytics and reporting. This industry leading technology provides cost effective, scalable protection capabilities against DDoS attacks in the most complex environments while enabling a more cost effective economic model than previously available. For more information, visit www.corero.com