Yes, it is possible to conduct a single Vulnerability Assessment (VA) or Penetration Testing (PT) as a one-time effort to assess the security of your systems. This single assessment can be valuable in identifying immediate vulnerabilities and weaknesses in your digital infrastructure. It serves as a starting point for improving your security posture.
However, it's important to note that cybersecurity is an ongoing process, and the threat landscape is constantly evolving. Therefore, while a single VA or PT can provide insights and help address immediate concerns, it may not be sufficient for long-term security.
Regular and periodic VA and PT assessments are recommended to keep your systems resilient against new threats and vulnerabilities that may emerge over time. The frequency of testing should be determined based on factors such as your industry, the nature of your systems, and regulatory requirements. Regular assessments help maintain a strong and proactive security posture, reducing the risk of security breaches and data loss.