Researchers find ‘backdoor’ in encrypted police and military radios::The TETRA standard is used in radios worldwide. Security researchers have found multiple vulnerabilities in the underlying cryptography and its implementation, including issues that allow for the decryption of traffic.
Unfortunately standards like this don’t get patches, they get replaced. The good news is that TETRA, at least from a US standpoint, has never been viewed as secure and isn’t used by the military for tactical communication