VectorSec: A Web-Based AI Security Scanner for Systematic Evaluation of LLM Vulnerabilities

Abstract

The increasing deployment of Large Language Models (LLMs) in critical infrastructure has introduced a class of security risks that remain insufficiently characterised and poorly tooled in practice. Attack vectors including prompt injection, jailbreaking, code execution facilitation, covert data exfiltration, and training data poisoning present quantifiable threats to systems that rely on LLM outputs, yet no lightweight, provider-agnostic tool exists to measure these risks systematically. This paper presents VectorSec, an open-source, web-based LLM security scanner built with Python and Dash. The tool executes a structured test suite of 320 adversarial prompts spanning 16 vulnerability categories aligned with the OWASP Top 10 for LLMs. Each response is scored through a four-stage pipeline combining pattern matching, sentiment analysis, semantic similarity, and secondary LLM verification. Evaluation across three open-source models demonstrates that pattern-matching-only filtering misses approximately 15% of High and Critical findings that semantic verification correctly identifies, motivating the multi-layer design. VectorSec provides interactive dashboard reporting, real-time progress tracking, and audit-ready PDF and CSV exports, lowering the barrier to structured LLM security assessment in operational settings.