A vulnerability has been found in Ledger Nano X, Flex and Stax up to 2.4.1 and classified as problematic . The impacted element is an unknown function of the component MCU Firmware Update Handler . The manipulation of the argument reset_handler leads to improper validation of specified quantity in input. This vulnerability is referenced as CVE-2025-15645 . It is possible to launch the attack on the physical device. No exploit is available. The affected component should be upgraded.