Zkteco Update Firmware Verified |best| | VALIDATED |

| Attack Scenario | Consequence | Real-world Example | |----------------|-------------|--------------------| | Malicious USB drop | Attacker replaces update.bin with rootkitted firmware | CVE-2021-34429 (ZKTeco backdoor) | | Man-in-the-middle (LAN update) | Inject RAT into firmware during TFTP transfer | Observed in access control systems | | Downgrade attack | Flash old vulnerable version with known default passwords | Common in time attendance devices | | Signature stripping | Remove verification header from newer firmware | Possible if device checks only header presence |

If they match, integrity is verified.

B. USB/SD card (local)

Q: What should I do if I encounter issues during the firmware update process? A: If you encounter issues during the firmware update process, contact ZKTeco support for assistance. zkteco update firmware verified