Director/PDMR Shareholding

18 September 2009

                                  Corero PLC                                   

                           ("Corero" or "the Group")                           

                            Director's Shareholding                            

The Company announces that Peter Waller, Executive Chairman of the Company, has
today purchased 5,000 ordinary shares in the capital of Corero, representing
0.33 per cent. of the voting share capital of the Company, at a price of 38
pence per share.

Following the purchase, Mr Waller holds a total of 15,600 ordinary shares,
equivalent to 1.03 per cent. of the voting share capital of the Company.

Enquiries:

Corero plc                                                                   
                                                                             
Peter Waller, Executive Chairman                            Tel: [phone]
                                                                             
Duncan Swallow, Financial Controller                        Tel: [phone]
                                                                             
John East & Partners Limited, a subsidiary of Merchant Securities PLC        
                                                                             
John East/Virginia Bull                                    Tel: [phone]