What Is Vulnerability Management?
Vulnerability management is a continuous process for identifying, evaluating, prioritising and correcting weaknesses across an organisation’s technology environment.
A practical lifecycle is:
Discover
Know the devices, applications and workloads that exist.
Assess
Identify vulnerabilities, outdated software and misconfigurations.
Prioritise
Determine which findings represent the greatest real-world risk.
Remediate
Patch, upgrade, reconfigure, remove or otherwise mitigate the weakness.
Verify
Confirm that the vulnerability is actually resolved.
Improve
Continue monitoring as systems, software and threats change.
Microsoft describes Defender Vulnerability Management around continuous asset discovery, continuous vulnerability assessment, risk-based prioritisation, remediation workflows and tracking across supported endpoints and cloud workloads.
1. Know What You Have
You cannot secure a system you do not know exists.
Start by identifying:
- Employee laptops
- Desktop computers
- Physical servers
- Virtual machines
- Cloud workloads
- Containers
- Network devices
- Applications
- Browsers
- Firmware
- Mobile endpoints
- Internet-facing systems
Asset visibility is especially important when organisations have multiple offices, remote employees or cloud infrastructure.
Microsoft Defender Vulnerability Management currently supports continuous asset discovery and monitoring and can maintain inventories of devices, software, certificates, browser extensions and firmware across supported environments.
The first question for IT should therefore be:
Can we confidently identify every important technology asset connected to our organisation?
2. Do Not Treat Every Vulnerability the Same
Imagine your vulnerability assessment identifies 500 findings.
Trying to fix all 500 simultaneously may not be practical.
A better process asks:
Is it internet facing?
A vulnerable publicly accessible system normally deserves more attention than an isolated internal test machine.
Is the vulnerability actively exploited?
A vulnerability already being used by attackers can require more urgency.
How important is the affected system?
A vulnerability affecting a financial platform may have different business consequences from one affecting a low-value test workstation.
What does successful exploitation provide?
Can the attacker obtain limited information—or full control of the system?
Are other protections reducing the risk?
Segmentation, endpoint protection or application controls may provide temporary mitigation while remediation is prepared.
CISA’s 2026 guidance specifically moves vulnerability prioritisation toward these risk factors rather than relying only on a static severity score.
3. Prioritise Known Exploited Vulnerabilities
A vulnerability can look dangerous theoretically.
Another vulnerability may actually be under active attack today.
Those situations should not always receive the same priority.
CISA maintains its Known Exploited Vulnerabilities — KEV — catalogue based on evidence of active exploitation. As recently as 4 August 2026, CISA added three more vulnerabilities based on active-exploitation evidence and again encouraged organisations beyond U.S. federal agencies to adopt risk-based remediation and prioritise KEV vulnerabilities.
Your vulnerability programme should therefore ask:
Is this CVE currently known to be exploited?
If yes, the remediation priority may need to increase significantly.
4. Protect Internet-Facing Systems First
Attackers do not need physical access to an exposed system.
High-priority systems may include:
- VPN gateways
- Firewalls
- Web servers
- Remote-access infrastructure
- Public APIs
- Cloud services
- Internet-facing management interfaces
Your organisation should have a defined emergency-patching process for critical exposed systems.
That process might include:
Identify → Assess → Test → Approve → Deploy → Verify
The objective is to move quickly without unnecessarily damaging business operations.
CISA’s implementation guidance emphasises balancing prompt risk remediation with continuity requirements for mission-critical systems.
5. Patch More Than Operating Systems
Many organisations think patch management means:
Install Windows Updates.
That is only part of the picture.
You should also review:
- Browsers
- Microsoft Office
- Third-party applications
- Linux systems
- Server applications
- Network-device firmware
- Firewalls
- Drivers
- Databases
- Cloud workloads
- Containers
- Business applications
A computer may have a fully updated operating system while still running vulnerable software.
Microsoft Defender Vulnerability Management currently provides vulnerability and inventory information across supported software, devices and cloud workloads and includes risk-based security recommendations.
6. Remove Software You No Longer Need
Sometimes the right remediation is not:
Patch it.
It is:
Remove it.
Unused software creates an unnecessary attack surface.
Examples include:
- Old remote-access software
- Trial applications
- Abandoned tools
- Unsupported applications
- Legacy plugins
- Applications left from completed projects
Every unnecessary application also creates another product your IT department must monitor and patch.
7. Replace Unsupported Technology
Some systems eventually reach end of support.
When the vendor stops providing security updates, vulnerabilities can become difficult or impossible to fix properly.
Unsupported systems may include:
- Old operating systems
- Legacy servers
- End-of-life network devices
- Old applications
- Unsupported firmware
If immediate replacement is impossible, temporary protections can include:
- Network isolation
- Restricted access
- Strong monitoring
- Tighter firewall rules
- Application controls
But these should be treated as temporary risk-reduction measures rather than permanent alternatives to supported technology.
8. Prioritise by Business Impact
Technical teams understand CVEs and severity scores.
Management needs to understand business risk.
Instead of reporting:
CVE-XXXX-XXXX — Critical
a better management discussion might be:
“This vulnerability affects the internet-facing system used for customer services. Exploitation could provide administrative access. A security update is available and remediation is recommended urgently.”
Palo Alto Networks’ Cortex Exposure Management uses exposure context to help prioritise findings and includes factors such as internet exposure, known exploitation status, reachability, available fixes, application criticality and access to sensitive data.
That context makes vulnerability management easier to connect with business decisions.
9. Give Every Important Vulnerability an Owner
Finding a vulnerability does not reduce risk.
Fixing it does.
Every important finding should therefore have:
Asset → Risk → Owner → Required Action → Deadline → Verification
The security team might discover the issue.
The IT team might install the update.
An application owner might need to test it.
Management might need to approve downtime.
The workflow should clearly define responsibility.
Microsoft provides built-in remediation workflows and tracking within Defender Vulnerability Management, while Cortex Exposure Management supports fix-oriented grouping and remediation workflows designed to help security and IT teams coordinate corrections.
10. Verify That the Patch Worked
Do not assume a vulnerability is resolved simply because someone clicked Install Update.
Verify:
- Was deployment successful?
- Did every affected device receive it?
- Is the vulnerable version gone?
- Is the security finding closed?
- Did the update create an operational problem?
The correct lifecycle is:
Find → Fix → Verify
not:
Find → Create Ticket → Forget
Verification is a core part of vulnerability-management and security-automation processes; NIST’s current SCAP work specifically includes vulnerability and patch-verification use cases for machine-readable security automation.
11. Measure Risk Reduction
Closing many low-risk vulnerabilities can make a report look impressive while critical exposures remain open.
Better performance indicators may include:
- Number of known exploited vulnerabilities
- Number of critical internet-facing vulnerabilities
- Unsupported assets
- Average remediation time
- Percentage of critical vulnerabilities fixed within target
- Vulnerability recurrence
- Exposure trend
- Overall risk reduction
The goal is not:
Close the most tickets.
The goal is:
Reduce the probability and impact of compromise.
Microsoft Defender Vulnerability Management
Microsoft’s current vulnerability-management platform supports capabilities including:
- Continuous asset discovery
- Continuous vulnerability assessment
- Risk-based prioritisation
- Security recommendations
- Remediation tracking
- Vulnerability assessment across supported endpoints and cloud workloads
- Agent-based and agentless assessment scenarios
Microsoft says prioritisation incorporates threat intelligence, likelihood of breach and business context so organisations can focus remediation on their most important exposures.
Palo Alto Networks Cortex Exposure Management
Cortex Exposure Management can consolidate exposure information from Palo Alto Networks sensors and supported third-party vulnerability sources.
Its current capabilities include:
- Consolidated exposure visibility
- Prioritisation
- Fix-oriented grouping
- Remediation workflows
- Automation
- Third-party vulnerability-data integration
Palo Alto Networks says the platform can group exposures around common remediation actions, allowing IT and security teams to focus on fixes that address larger groups of prioritised vulnerabilities.
Junubia Host Vulnerability Management Process
Step 1 — Discover
Identify endpoints, servers, applications and cloud workloads.
Step 2 — Assess
Identify vulnerabilities, outdated software, unsupported systems and security misconfigurations.
Step 3 — Prioritise
Consider exploitation, internet exposure, system criticality and business impact.
Step 4 — Remediate
Patch, update, reconfigure, remove or mitigate.
Step 5 — Verify
Confirm that the exposure has actually been corrected.
Step 6 — Monitor
Continue identifying new vulnerabilities and changes.
Step 7 — Report
Provide management with clear information about security risk and remediation progress.
Vulnerability & Patch Management Checklist
Ask your IT team today:
- Do we know every important endpoint and server?
- Are we continuously checking for vulnerabilities?
- Do we monitor known exploited vulnerabilities?
- Do we know which vulnerable systems are internet facing?
- Are third-party applications included?
- Are cloud workloads assessed?
- Do we identify unsupported technology?
- Who owns each critical vulnerability?
- How quickly do we patch high-risk weaknesses?
- Do we verify that remediation succeeded?
- Can management see outstanding security risk?
- Is our overall exposure decreasing?
If several answers are unclear, your organisation should consider a structured vulnerability and patch-management assessment.
