A critical alert details a cyber security vulnerability that entities should take immediate action to minimise the risk. The ACSC has assessed that network owners and operators be informed of the threats so that they can take actions to minimise risk and impact to their networks. Critical alerts refer to vulnerabilities that are currently or will imminently impact Australia, due to a publicly available trivially exploitable proof-of-concept and evidence of active exploitation, and at the time of publication will require drastic actions to minimise harm to networks.