Every IT infrastructure has vulnerabilities. The only question is whether your organization finds them first, or an attacker does. Vulnerability management gives you exactly that head start: a continuous process that makes security gaps visible, ranks them by real-world risk and turns them into concrete action.

Key Takeaways
Vulnerability management is the ongoing process of finding, assessing, prioritizing and fixing security gaps in IT systems, networks and applications. Unlike a one-off scan or plain patching, it treats IT security as a cycle that never really ends, because new vulnerabilities are disclosed every day. OPENVAS automates detection and delivers the prioritization you need to spend your IT budget where it matters.
Key benefits include:
  • A significantly smaller attack surface through the early closure of known gaps
  • Prioritization based on actual risk instead of guesswork
  • A verifiable foundation for NIS2, the Cyber Resilience Act and ISO 27001

What Is Vulnerability Management?

Vulnerability management is the systematic process organizations use to find security gaps in their IT infrastructure, rank them by severity and fix them in a targeted way. It means taking the perspective of an attacker and checking from the outside which systems, services and applications are genuinely exploitable.

Vulnerability management is more than patch management: patching closes an already known, specific gap, while vulnerability management makes sure that gap gets found and correctly classified in the first place, including cases where no patch exists or a misconfiguration is the real cause. The organizational foundation for this is a working IT security management program, while the page Data Security covers protecting the data itself.

The Phases of the Vulnerability Management Cycle

Vulnerability management is not a one-off project. It is a cycle of six steps that keeps repeating:

Vulnerability Management Cycle

1. Discover

Automated scans search your network, endpoints and applications for known and newly published vulnerabilities.

2. Assess

Every finding gets a CVSS rating, enriched with context such as exploitability and the systems it affects.

3. Prioritize

Asset criticality, exposure to the internet and active exploitation in the wild decide the order in which gaps get closed.

4. Remediate

Depending on the case, through a patch, a configuration change or a compensating control if no patch is available.

5. Verify

A follow-up scan confirms the fix actually works and that no new vulnerability was introduced in the process.

6. Repeat

Since new vulnerabilities are disclosed every day, the cycle starts right back over instead of ending after one pass.

Vulnerability Management by the Numbers

Current research shows just how wide the gap between disclosure and actual remediation often is:

54.8 days

average time to remediate critical and high-severity vulnerabilities in 2025, according to the Edgescan Vulnerability Statistics Report 2026

45.4%

of all vulnerabilities found in enterprises are still open twelve months later, according to the Edgescan Vulnerability Statistics Report 2025

20%

of data breaches started with an exploited vulnerability, according to the Verizon Data Breach Investigations Report 2025, up 34% from the year before

Sources: Edgescan Vulnerability Statistics Report 2025 and 2026; Verizon Data Breach Investigations Report 2025.

How to Prioritize Remediation

No organization can fix every vulnerability at once. Three factors decide which gap gets closed first:

Vulnerability Management Priority

Exposure

A gap in a publicly reachable web server carries more risk than the same gap on an isolated offline system.

Exploitability

A high CVSS score, a known public exploit or active exploitation already under way move a vulnerability further up the queue.

Asset Criticality

Damage to production control systems carries a heavier economic cost than the same downtime on a marketing server.

Patching still matters, but it does not replace vulnerability management: some gaps simply have no patch, others cannot be updated because of a business-critical application, and misconfigurations such as a weak admin password appear regardless of how current your patch level is.

Vulnerability Management, Patch Management and Penetration Testing Compared

The three terms are often confused, but they complement rather than replace one another:

Area Focus Frequency Typical Output
Vulnerability Management Systematically finding, assessing and fixing all vulnerabilities Continuous, updated daily A prioritized list with recommended actions
Patch Management Deploying available updates for already known gaps Follows the vendor's patch cycle An updated software version
Penetration Testing A targeted, manual attack attempt on selected systems Point-in-time, usually once or twice a year A detailed report on concrete attack paths

If you are specifically interested in a transparent, openly viewable scanner core, the page Open Source Vulnerability Management covers the benefits and limits of that approach in detail.

Vulnerability Management Under ISO 27001

ISO/IEC 27001:2022 does not just imply vulnerability management, it requires it through a dedicated control: Annex A 8.8, “Management of Technical Vulnerabilities” (carried over from Annex A 12.6.1 in the 2013 version of the standard). The control obliges certified organizations to obtain timely information about technical vulnerabilities in the systems they use, assess their own exposure and take appropriate remediation measures.

What matters to auditors is less the specific tool and more the evidence of a working process: a current asset inventory, a documented scan frequency, traceable prioritization and proof of remediation deadlines being met. OPENVAS generates exactly this evidence automatically, from initial detection through CVSS scoring to the verification scan after remediation.

Which Companies Benefit from Vulnerability Management

Vulnerability management scales with company size, not just upward:

Small Businesses

With few IP addresses and no dedicated security team, small businesses benefit from an entry point that is ready to run in minutes.

Mid-Sized Companies

With a growing system landscape and multiple sites, continuous scanning keeps new vulnerabilities from slipping through individual departments.

Enterprises & Public Sector

With many branch offices and regulatory reporting duties, vulnerability management provides the audit-ready foundation for NIS2, the Cyber Resilience Act and ISO 27001.

Vulnerability Management with Greenbone

OPENVAS tests your network and every connected device against more than 100,000 vulnerability tests in the OPENVAS ENTERPRISE FEED, which is updated several times a day. You get an up-to-date view of your security posture, including severity and a recommended action for every finding.

Follow a manual added link
Automated vulnerability management for medium and large organizations, with continuous scanning, CVSS-based prioritization and the full Enterprise Feed.
Vulnerability scanning for small businesses and single sites, ready to run in minutes and free to try for 14 days.

Compare the Community Feed and the Enterprise Feed

Where Vulnerability Management Is Heading

Risk-Based Prioritization (EPSS)

Alongside CVSS, the actual likelihood of exploitation (EPSS) increasingly shapes prioritization, instead of treating every critical gap the same.

From Vulnerabilities to Attack Surface

Organizations are increasingly looking at their entire attack surface rather than individual vulnerabilities, including cloud assets and shadow IT.

Regulatory Pressure Is Rising

With the NIS2 Directive and the Cyber Resilience Act, continuous vulnerability management is becoming a legal requirement rather than a nice-to-have for more and more organizations.

Vulnerability Management Checklist

A concrete starting point for building a structured vulnerability management practice:

  • Build a complete asset inventory, including cloud and shadow IT
  • Set up automated scanning for both internal and external networks
  • Define scan intervals and assign ownership per system
  • Define prioritization based on CVSS, exposure and asset criticality
  • Set binding remediation deadlines by severity level
  • Run a verification scan after every remediation
  • Report results regularly to leadership and auditors

Frequently Asked Questions About Vulnerability Management

Vulnerability management is the ongoing process of finding security gaps in IT systems, ranking them by severity and fixing them in a targeted way, rather than checking for them once.

Patch management deploys available updates for already known gaps. Vulnerability management finds and assesses those gaps in the first place, including cases where no patch exists or a misconfiguration is the actual cause.

Since new vulnerabilities appear every day, scans should run continuously rather than once. Critical, internet-facing systems benefit from daily scans, while internal systems often work well on a weekly cycle.

CVSS rates how severe a vulnerability is in theory. EPSS adds an estimate of how likely it is to actually be exploited in the coming days, which sharpens prioritization.

OPENVAS BASIC starts at €2,524 per year as an entry-level solution for small businesses. OPENVAS SCAN is priced based on the environment being scanned and is calculated individually on request.

All of them: small businesses with just a handful of IP addresses benefit just as much as large enterprises and public agencies with many sites and complex reporting duties.

ISO 27001:2022 requires certified organizations, through Annex A Control 8.8, to identify technical vulnerabilities in a timely manner, assess their own exposure and implement appropriate countermeasures. Auditors mainly check the asset inventory, scan frequency and documented remediation deadlines.

Both frameworks require affected organizations to actively manage vulnerabilities in their systems and products and to document incidents in a traceable way. Continuous vulnerability management provides the technical foundation for that.

Vulnerability management describes the general process, regardless of the tool used. Open source vulnerability management additionally focuses on a transparent, openly viewable scanner core. Read more on the page Open Source Vulnerability Management.

How Well Do You Really Know Your Own Vulnerabilities?

Let us check together where your IT infrastructure stands today and what a vulnerability management process tailored to you could look like.