Department of Defence The Australian Cyber Security Centre (ACSC) has today released updated advice on cyber.gov.au detailing the cyber security threat to Australian businesses and organisations who are yet to patch vulnerable versions of Microsoft Exchange. Assistant Minister for Defence, the Hon Andrew Hastie MP, said Australian businesses and organisations that use Microsoft Exchange should urgently patch their vulnerable versions of Microsoft Exchange, and protect themselves from potential compromise. “Our first priority is to keep Australians safe, including when online, and it is vital that Australian small businesses and organisations take the necessary steps to protect themselves from this vulnerability,” Assistant Minister Hastie said.