Vulnerability Remediation Timelines: 7 Best Practices

Edgescan reports that the “Mean Time to Remediation (MTTR) for Critical Severity vulnerabilities is almost 55 days. They further state that 19% of all vulnerabilities were rated as High or Critical Severity in 2025. With so many risky vulnerabilities taking over 2 months to remediate, it can leave IT environments unprotected and open to attack.

To avoid the headache of a security breach, organizations must be proactive in their approach to effectively secure the IT environment. It’s crucial for MSPs and IT professionals to implement vulnerability remediation timelines and best practices to ensure vulnerabilities are remediated promptly and that their IT assets and associated data are protected. These best practices also help businesses set practical time frames for handling and addressing these vulnerabilities.

To see how these best practices unfold, you may watch this short video: ‘Vulnerability Remediation Timelines: 7 Best Practices’.

7 vulnerability remediation timelines best practices

1. Establish a vulnerability management process

A vulnerability management process is a set of procedures that guides how vulnerabilities are identified, evaluated, and remediated. This process is essential for your business to know how to properly address certain vulnerabilities in your IT environment.

How to do it:

The four key steps of a vulnerability management process are to locate and identify vulnerabilities, evaluate them, monitor and remediate the identified vulnerabilities, and finally confirm whether the vulnerabilities have been mitigated. With the help of RMM software, IT pros can simply monitor the environment for vulnerabilities and remediate issues.

Why it’s important:

Establishing this process will guide your company’s actions in addressing weak spots in your IT systems that are vulnerable to exploitation. This process is also foundational to creating vulnerability remediation timelines, as it contains all the necessary steps to account for in your timelines.

2. Follow remediation guidelines

When establishing a plan for addressing vulnerabilities, it is wise to consult organizations and agencies that are in the know. The Cybersecurity and Infrastructure Security Agency (CISA) now ties remediation urgency to risk rather than severity alone.

Under BOD 26-04: Prioritizing Security Updates Based on Risk, CISA replaced its earlier severity-based rule with a four-factor model that weighs whether a vulnerability is publicly exposed, listed in CISA’s Known Exploited Vulnerabilities (KEV) catalog, exploitable through automation, and how much control it grants an attacker.

Under this model, the highest-risk vulnerabilities carry a three-day remediation window, while lower-risk ones can extend to 60 days. Even organizations outside the federal government can use this same four-factor logic to build defensible, risk-based remediation timelines rather than relying on the severity score alone.

How to do it:

Rather than assigning a single deadline by severity, score each vulnerability against CISA’s four factors: exposure, KEV status, exploit automation, and technical impact. The higher the combined risk, the shorter the remediation windows should be, while vulnerabilities that meet fewer of these conditions can carry longer windows.

Why it’s important:

IT vulnerabilities all carry a risk of exploitation, but that risk varies based on exposure, exploitability, and potential impact, not severity score alone. CISA introduced this model in response to AI-accelerated exploit automation, which narrows the gap between disclosure and attack.

Tying your remediation timeline to actual risk, rather than treating every critical or high vulnerability the same, directs your fastest response to the vulnerabilities attackers are most likely to exploit first.

Learn more in our NinjaOne Patch Management FAQ to see how automated patching helps you meet remediation timelines.

3. Prioritize vulnerabilities

Prioritizing IT vulnerabilities based on their severity and exploitability is essential. Doing so allows you to dedicate and allocate the necessary resources for remediation and plan your remediation timelines accordingly. Ranking vulnerabilities also allows you to establish the potential impact vulnerabilities will have on the organization and helps you determine where certain remediations need to fit into your remediation timelines.

How to do it:

Establish a system for ranking potential IT vulnerabilities. Base it on potential business impact, severity, and the likelihood of exploitability. Once your organization’s ranking system is established, prioritize and address the most severe vulnerabilities first on the timeline.

Supplement CVSS scores with EPSS (Exploit Prediction Scoring System) to prioritize remediation. EPSS predicts the likelihood of active exploits within 30 days, focusing resources on the most immediate threats.

Why it’s important:

Prioritizing the most critical vulnerabilities helps businesses to strategically address and remediate them. Ranking vulnerabilities also allows businesses to create a plan and remediation timeline to address vulnerabilities in order of severity.

4. Keep track of your IT assets

Keep an updated inventory of all your hardware and software assets. Ideally, this information should all be kept in one central location. By tracking all your organizational assets, you can identify vulnerable assets, prioritize them based on your ranking system, and remediate them accordingly.

How to do it:

Use tools to track the IT assets that give you increased visibility into your IT environment, like NinjaOne’s IT asset management software. Regularly scan the environment for new devices or applications to ensure your IT asset inventory is continually updated.

Why it’s important:

An up-to-date IT asset inventory provides you with correct information about your IT environment so you can accurately identify vulnerabilities within the entire infrastructure. With full visibility into the environment, it helps prevent assets from being overlooked and enables quicker identification of vulnerabilities. This helps speed up remediations, so your systems are vulnerable for a shorter period.

Check out our IT Asset Management FAQ to learn how asset visibility supports faster vulnerability remediation.

5. Create a vulnerability management policy

Vulnerability management policies outline how your organization manages vulnerabilities within its IT environment. This type of policy states the plans and agreement for how and when vulnerabilities will be addressed and remediated. A patch management policy is an example of a vulnerability management policy, which contains documentation on how patches are managed and applied to endpoints within an organization.

How to do it:

Create a policy with clear guidelines on how to handle the identification, assessment, and remediation of vulnerabilities. Assign specific vulnerability management roles to employees or specified end users to ensure the policy is implemented.

Why it’s important:

A vulnerability management policy keeps your IT team accountable for how vulnerabilities are handled. If remediation deadlines are missed, the policy must mandate formal Risk Acceptance by a senior leader. This acceptance requires the immediate use of a compensating control (such as network segmentation or temporary patching) to mitigate the threat. It helps to ensure that any potential risks in your IT environment are effectively addressed in a timely manner. Policies also provide structure to risk management, which helps your organization meet its remediation timeline goals.

6. Vulnerability remediation reporting

Generate a report on the progress and outcomes of your vulnerability remediation efforts. This will allow you to determine what’s working, areas that may be lacking, and decide where to focus future efforts.

How to do it:

Regularly generate vulnerability remediation reports on the number and type of vulnerabilities identified, and how well they were addressed. Important metrics to track include: Mean Time to Detect (MTTD), Mean Time to Remediate (MTTR), and the Remediation Compliance Rate (the percentage of critical/high vulnerabilities remediated within the established policy window). Include information about how quickly remediations took place, and whether they met the time frame goals.

Why it’s important:

In order to know whether you’re meeting your vulnerability remediation timeline goals, reporting is essential. It helps you assess how well your remediation efforts are working and determine whether changes are needed.

7. Implement IT automation

IT automation tools can speed up vulnerability management processes and streamline repetitive management tasks. It eliminates human error, allowing devices and your IT environment to be quickly protected and secured.

How to do it:

Use software to automate specific tasks within your vulnerability management process, such as patch deployment and vulnerability scanning.

Why it’s important:

Manual remediation of IT vulnerabilities can be time-consuming and may prevent you from reaching your remediation timeline goals. IT automation frees up your technicians to perform other tasks and ensures that essential vulnerability management and remediation tasks are completed in a timely manner.

Automated vulnerability remediation

NinjaOne’s software helps organizations get full visibility into their environment and reduce IT vulnerabilities. Our automated vulnerability management software allows organizations to rest assured that their IT environment is being actively protected at all hours of the day.

Watch a demo or sign up for a free trial of NinjaOne’s vulnerability management software to see how Ninja can improve your endpoint security.