TETRA:BURST is a collection of five vulnerabilities, two of which are deemed critical, affecting the Terrestrial Trunked Radio (TETRA) standard used globally by law enforcement, military, critical infrastructure, and industrial asset owners in the power, oil & gas, water, and transport sectors and b...
Only for the agencies that use TETRA, and only for the agencies still using TEA1 encryption vs more modern versions. This was responsibly disclosed and there are firmware updates available from at least a couple manufacturers AFAIK