Director/PDMR Shareholding

27 July 2007

                                  Corero Plc                                   

                          ("Corero" or the "Company")                          

                              Holding in Company                               

The Company has been notified that Peter Waller, Executive Chairman of the
Company, has today purchased 50,000 ordinary shares at 12p each, equivalent to
0.11 per cent. of the total voting rights of Corero, Mr Waller now holds
168,000 ordinary shares, equivalent to 0.37 per cent. of the total voting
rights of the Company.

In addition, the Company has been notified that Ian Selby, Finance Director of
the Company, has today purchased 20,000 ordinary shares at 12.115p each,
equivalent to 0.04 per cent. of the voting rights of Corero, which will be held
in his Self Invested Pension Fund. Mr Selby is now beneficially interested in
286,553 ordinary shares, equivalent to 0.63 per cent. of the total voting
rights of the Company.

Contacts                                                                       
                                                                               
Corero PLC                                                                     
                                                                               
Peter Waller (Executive Chairman)                                  07785 228080
                                                                               
Ian Selby (Finance Director)                                       01923 695191
                                                                               
John East and Partners Limited                                    0207 628 2200
                                                                               
John East/Virginia Bull                                                        
                                                                               
College Hill Associates                                           0207 457 2020
                                                                               
Matthew Smallwood/Jamie Ramsay