Once vulnerabilities are detected in an assessment, they must be prioritized for remediation. This helps ensure that the most critical vulnerabilities are remediated first.
Vulnerability prioritization reduces the exploitable attack surface and minimizes the risk of data breaches, service disruptions, compliance violations, and reputational damage. It also aligns security efforts with business objectives by identifying critical assets containing sensitive data or revenue-generating systems.
Conduct an Exploitability Analysis
Vulnerabilities can have different impacts on your business. For instance, a vulnerability may appear critical to your security operations because it has an excellent Common Vulnerability Scoring System (CVSS) score. Still, when you dig deeper, it turns out that the vulnerability doesn’t present much of a threat to your code, software, or applications.
Exploitability factors into the vulnerability prioritization process by assessing how easy it would be for attackers to exploit the vulnerability and impact your organization. This is important because relying solely on CVSS scores provides an incomplete picture, as low-ranked vulnerabilities can often be chained together to expose systems and data.
Once you have the exploitability and impact scores, it’s time to determine how severe the vulnerability is. This will consider whether the vulnerability has a fix, how critical your assets are to your operations, and how much damage a breach could cause your organization, such as data loss, downtime, regulatory compliance violations, or reputational damage.
Determine the Priority of the Vulnerability
To effectively prioritize vulnerabilities, it is critical to understand your organization’s goals and risk tolerance levels. This will enable you to develop a vulnerability remediation strategy that balances security efforts with business needs.
Vulnerability prioritization involves ranking vulnerabilities based on their severity, exploitability, impact, and other contextual factors such as asset information, threat intelligence, and business context. This process helps to ensure that the most severe vulnerabilities are addressed first, which can significantly reduce the risk of a data breach and minimize the impact on the business.
Using this process, you can identify which vulnerabilities pose the greatest threat to your specific code, software, and applications. This can help you focus on remediating these vulnerabilities quickly and efficiently, minimizing the risk of a data breach, service disruption, regulatory compliance violations, reputational damage, and other costly impacts. Vulnerability remediation backlogs are a common challenge faced by many organizations today. Vulnerability management can help to manage these backlogs and prevent them from affecting business operations.
Determine the Impact of the Vulnerability
A vulnerability is an opportunity for attackers to steal information or disrupt systems. However, most vulnerabilities disclosed each year never pose any real threat to organizations.
Organizations must consider various factors such as severity, exploitability, and impact to assess and prioritize vulnerabilities effectively. They also need to take into account their unique business context.
For example, a financial organization will prioritize vulnerabilities that threaten sensitive data and critical transactions. They will also emphasize addressing vulnerabilities that impact their revenue-generating systems.
Another factor to consider is whether a fix is available. There is no point in prioritizing a vulnerability if you can do nothing to mitigate its impact. If a fix is unavailable, you must determine how much risk you can accept and choose a remediation plan accordingly. This might include a combination of temporary workarounds and longer-term mitigations.
Determine the Severity of the Vulnerability
The severity of a vulnerability reflects how easily an attacker can exploit it to gain access, privileges, or some other negative outcome. Generally, the higher the exploitability and CVSS score of a vulnerability, the more it should be prioritized for remediation.
To determine the impact, consider whether a vulnerability increases the amount of access or privileges an attacker gains or reduces system availability or integrity. The value of the asset and its context also helps to determine how severe a vulnerability is.
Vulnerability prioritization allows organizations to efficiently allocate resources to address threats and minimize the attack surface. It also helps to align security with business objectives and mitigate the risk of data breaches, service disruptions, compliance violations, reputational damage, and legal liabilities. Organizations should incorporate security testing into their development pipelines and third-party library and API scanning to prioritize vulnerabilities, use continuous monitoring tools, and conduct regular vulnerability assessments. This will ensure that the most severe vulnerabilities are remediated first while keeping their focus on critical systems and sensitive information.