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Vulnerability Management

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Vulnerability Management

Vulnerability Management is the continuous process of identifying, assessing, prioritizing, remediating, and monitoring security weaknesses (vulnerabilities) in systems, networks, applications, and devices. The goal is to find and fix security problems before attackers can exploit them. What is a Vulnerability? A vulnerability is a weakness that could be exploited by an attacker. Examples: Missing security patches Weak passwords Misconfigured firewalls Outdated software Open network ports Insecure applications Example: Plain Text Windows Server ↓ Missing Security Update ↓ Vulnerability Exists An attacker may use that weakness to gain access. Vulnerability vs Threat vs Risk These terms are frequently tested on Security+ exams. Vulnerability A weakness. Example: Plain Text Unpatched Server Threat Something capable of exploiting a weakness. Example: Plain Text Hacker Malware Ransomware Risk The likelihood and impact of a threat exploiting a vulnerability. Plain Text Risk = Threat + Vulnerability Example: Plain Text Ransomware + Unpatched System = High Risk Vulnerability Management Lifecycle Most organizations follow a repeating cycle. 1. Identify Assets Determine what needs protection. Examples: Servers Laptops Databases Firewalls Cloud workloads Applications Plain Text Know What You Own 2. Discover Vulnerabilities Scan systems for weaknesses. Examples: Missing patches Open ports Weak configurations Outdated software Tools may automatically scan systems. 3. Assess Vulnerabilities Determine: Severity Impact Likelihood of exploitation Example: Plain Text Critical Vulnerability gets higher priority than: Plain Text Low-Risk Misconfiguration 4. Prioritize Not all vulnerabilities are equally dangerous. A critical Internet-facing vulnerability may need immediate attention. Plain Text Critical High Medium Low 5. Remediate Fix the vulnerability. Examples: ✅ Install patches ✅ Update software ✅ Change configurations ✅ Disable services ✅ Replace vulnerable systems 6. Verify Rescan systems to confirm the problem is fixed. Plain Text Patch Applied ↓ Rescan ↓ Vulnerability Gone 7. Monitor Continuously New vulnerabilities appear every day. Vulnerability management is an ongoing process. Vulnerability Scanning A vulnerability scanner automatically searches for security weaknesses. Examples: Tenable Nessus Qualys Rapid7 InsightVM OpenVAS The scanner checks: Plain Text Operating Systems Applications Ports Services Configurations Common Vulnerability Scoring System (CVSS) Many vulnerabilities receive a CVSS score. Range: Plain Text 0.0 - 10.0 Severity Levels Score Severity0.1-3.9 Low 4.0-6.9 Medium 7.0-8.9 High 9.0-10.0 Critical Example: Plain Text CVSS 9.8 is considered Critical. Patch Management Patching is a major part of vulnerability management. Example: Plain Text Software Vulnerability ↓ Vendor Releases Patch ↓ Install Update Benefits: ✅ Closes security holes ✅ Reduces attack surface ✅ Improves system security Common Vulnerabilities Missing Patches Plain Text Outdated Operating System Weak Passwords Plain Text Password123 Open Ports Unnecessary services exposed to the Internet. Misconfigured Systems Example: Plain Text Public Database accessible to everyone. Unsupported Software Example: Plain Text End-of-Life Software No longer receives security updates. Vulnerability Management vs Penetration Testing Vulnerability Management Penetration TestingContinuous Process Periodic Testing Finds Weaknesses Attempts Exploitation Automated Scans Manual Techniques Ongoing Monitoring Point-in-Time Assessment Example Vulnerability Scan: Plain Text Port 445 Open Penetration Test: Plain Text Can an attacker exploit Port 445?   Benefits of Vulnerability Management ✅ Reduces cyber risk ✅ Prevents attacks ✅ Improves compliance ✅ Supports audits ✅ Protects sensitive data ✅ Improves security posture ✅ Helps prevent ransomware Real-World Example A Nessus scan finds: Plain Text Microsoft Server ↓ Critical Patch Missing ↓ CVSS 9.8 The security team: Prioritizes the issue Applies the patch Rescans the server Verifies remediation Security+ Exam Tips Remember the Process Plain Text Identify Scan Assess Prioritize Remediate Verify Monitor   Key Terms Vulnerability Threat Risk CVSS Patch Management Vulnerability Scanner Common Tools Nessus Qualys Rapid7 OpenVAS Quick Memory Trick Plain Text Find It Fix It Verify It Monitor It Simple Definition Vulnerability Management is the ongoing process of identifying, assessing, prioritizing, fixing, and monitoring security weaknesses in systems, networks, applications, and devices to reduce the risk of cyberattacks and data breaches.
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