Belgium is investigating an alleged data breach of its state security service (VSSE) by Chinese government hackers.The breach occurred through the exploitation of a vulnerability in Barracuda's Email Security Gateway (ESG) appliance.China-backed hackers exfiltrated 10% of the Belgian intelligence service's emails and accessed personal data of half of VSSE's employees.VSSE has discontinued the use of Barracuda's products following the cyberattack.