This paper presents a vulnerability scanner implemented in Python to identify security weaknesses across networked systems and web applications. The scanner integrates multiple modules to perform comprehensive security assessment, including network discovery, service version detection, port scanning, and web vulnerability analysis. A modular architecture enables easy extension with new plugins for common protocols (HTTP, SSH, FTP, SMB) and data sources such as CVE databases and vendor advisories. The tool emphasizes security best practices including least-privilege operation, secure credential handling, and audit logging. Output is generated in both human-readable formats and machine-friendly JSON, with options to export reports to HTML or CSV for integration with CI/CD pipelines. By providing an extensible, Python-based solution, this scanner enables security teams to efficiently identify, prioritize, and remediate vulnerabilities across heterogeneous infrastructures.