AI voice cloning has turned phone-based social engineering into a scalable, convincing threat. Here is how AI vishing works and how to defend against it.
Vishing — voice phishing — is a social engineering attack carried out over the phone. An attacker calls an employee, impersonates a trusted party such as IT support or an executive, and pressures them into resetting a password, approving a payment, or revealing a one-time code. AI vishing adds synthetic voice: the caller's voice can now be cloned from a few seconds of public audio, and a language model can improvise the conversation in real time.
Phone calls carry an urgency and authority that email rarely does. When the voice on the line sounds like a real colleague and references real details — a project, a vendor, a recent meeting — the usual verification instincts break down. Because the whole process can be automated, attackers can run it at scale rather than one call at a time.
Awareness alone is not enough, because employees cannot reliably detect a good voice clone. The durable defenses are procedural: out-of-band verification for sensitive requests, callback policies, and codewords for high-risk actions. The way to make those stick is to test them — run authorized vishing simulations so employees experience the pressure in a safe setting and practice the right response.
Vyvern includes AI vishing among the channels it tests, alongside email, social media, and SMS, so security teams can measure how their people respond to a live phone-based pretext and train the ones who need it.
See how Vyvern tests and trains against attacks like this.
