Glossary
Zero-day
A flaw still unknown to the vendor, and therefore with no patch: attackers can exploit it before any defence exists.
A "zero-day" flaw is a security defect that the software vendor does not yet know about; there is therefore no patch at the moment it is exploited. The name comes from the fact that they have had "zero days" to fix it. These flaws are highly sought after by attackers; monitoring and layered defence then limit the damage.
See also
Zero trustA security approach that trusts no one by default and verifies every access.XDRAn evolution of the EDR that cross-references signals from workstations, the network, email and the cloud in a single tool.DLPTools that spot and block unauthorised sends of sensitive information out of the organisation.FirewallA filter that controls network traffic and allows or blocks connections according to rules.