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Whisper Web Text-to-Speech — agentic threat model

2.7AIVSS 2.7 · Low

Whisper Web is a local, browser-based speech-to-text utility with extremely low agentic risk. Because it lacks autonomy, planning, tool use, and external data transmission, its primary security boundaries are defined by the browser sandbox and web supply chain security.

OWASP AIVSS score rationale

AIVSS = (CVSS_Base + AARS) × Mitigation_Factor, where AARS = (10 − CVSS_Base) × (Factor_Sum / 10) × ThM
CVSS base 4.3AARS uplift 0.26Factor sum 0.5/10Threat ×0.9Mitigation ×0.6
Autonomy of Action
0.00
Goal-Driven Planning
0.00
Self-Modification
0.00
Dynamic Tool Use
0.00
Persistent Memory
0.00
Contextual Awareness
0.10
Dynamic Identity
0.00
Multi-Agent Interactions
0.00
Non-Determinism
0.20
Opacity & Reflexivity
0.20

Scored with the canonical OWASP AIVSS formula (AIVSS calculator reference); agentic risk factors estimated from the agent’s described capabilities.

MAESTRO 7-layer threat model

Per-layer threats for this agent. Layers tagged “not certain from listing” are general, caveated commentary where the public description didn’t pin that layer.

L1 · Foundation Models✓ mapped

Uses OpenAI's Whisper model running locally (likely via ONNX Runtime Web or WebGPU). Threats are limited to adversarial audio inputs designed to cause transcription errors, or model tampering if the model weights are intercepted/modified during initial download.

L2 · Data Operations✓ mapped

Data operations are entirely local and ephemeral, processing audio files directly in the browser's memory. There is no remote vector database or RAG pipeline, eliminating remote data exfiltration and knowledge-base poisoning risks.

L3 · Agent Frameworks✓ mapped

Does not utilize an agentic orchestration framework, planning loops, or tool-calling mechanisms. The execution flow is a straightforward, deterministic pipeline from audio input to text output, eliminating tool misuse and framework-level vulnerabilities.

L4 · Deployment & Infrastructure✓ mapped

Runs within the client-side browser sandbox, which inherently limits host system access. The primary infrastructure threat is a supply chain compromise of the static web hosting provider or CDN, which could allow an attacker to inject malicious JavaScript (XSS) to exfiltrate audio or transcripts.

L5 · Evaluation & Observability⚠ not certain from listing

Not certain from the listing — likely lacks any centralized evaluation, monitoring, or telemetry logging to preserve its strict privacy model. Any observability is restricted to local browser console logs.

L6 · Security & Compliance (cross-cutting)⚠ not certain from listing

Not certain from the listing — no formal compliance certifications (such as SOC2 or ISO 27001) are mentioned. However, the local-only architecture inherently simplifies compliance with data privacy regulations like GDPR and HIPAA since no personal data is processed or stored by a third party.

L7 · Agent Ecosystem✓ mapped

This application operates in complete isolation. It does not interact with other agents, marketplaces, or external APIs, entirely eliminating ecosystem-level risks and cascading multi-agent failures.

MAESTRO — the 7-layer agentic threat-modeling framework (Cloud Security Alliance / Ken Huang).