Voice biometric spoofing uses synthetic or modified voice specifically tuned to defeat voice authentication systems. Where standard voice cloning aims to fool human listeners, biometric spoofing aims to fool the algorithm.

• Attackers use cloned voices, voice conversion, or replayed audio crafted against a known biometric system
• Generative tools fine-tuned on the target speaker can produce output that matches the acoustic features biometrics rely on
• Adversarial audio adds imperceptible perturbations designed to push a biometric model toward a false accept

• Account takeover at banks using voice ID for self-service authentication
• IVR bypass to access account details, change addresses, or initiate transfers
• Defeat of voice liveness checks in remote identity verification
• Insider attacks where former employees use captured voice samples against legacy biometric systems
• Synthetic identity onboarding where the attacker enrolls a fabricated voice profile