Standard Operating Procedure: Vulnerability Management

This Standard Operating Procedure (SOP) establishes a formalized framework for the identification, classification, prioritization, and remediation of security vulnerabilities within the organization’s IT infrastructure. The primary objective of this process is to minimize the organization's attack surface and ensure that security risks are managed in accordance with regulatory requirements and internal risk appetite. By adhering to this lifecycle, the organization ensures a systematic approach to maintaining the confidentiality, integrity, and availability of information assets.

1. Vulnerability Discovery and Scanning

• Asset Inventory Verification: Ensure all endpoints, servers, network devices, and cloud instances are accounted for in the Configuration Management Database (CMDB) prior to scanning.
• Automated Scanning Configuration: Deploy authenticated credentialed scans to ensure deep visibility into local configurations and installed software.
• Scanning Frequency: Schedule weekly discovery scans and trigger ad-hoc scans immediately following major system changes or the release of high-severity industry advisories (e.g., Zero-Day alerts).
• Scan Coverage: Ensure scanners have network access to all subnets, including DMZs, production environments, and segmented development zones.

2. Analysis and Prioritization

• Data Normalization: Consolidate raw scan output into a centralized Vulnerability Management System (VMS).
• Risk Scoring: Utilize the Common Vulnerability Scoring System (CVSS) to classify findings. Adjust scores based on internal Business Impact Analysis (BIA) and the presence of "Exploit Code Maturity" (EPSS).
• Validation: Verify scan results to eliminate false positives—e.g., confirming a reported vulnerability is not mitigated by existing compensating controls like WAF rules or IPS signatures.
• Stakeholder Notification: Categorize vulnerabilities by asset owner and assign remediation tasks based on defined Service Level Agreements (SLAs).

3. Remediation and Mitigation

• Remediation Action: Apply vendor-supplied patches, firmware updates, or configuration changes.
• Compensating Controls: If a patch cannot be applied due to system instability or legacy requirements, implement compensating controls (e.g., VLAN isolation, disabling specific ports/services) and document them as a formal risk acceptance exception.
• Change Management: All remediation actions must follow the standard Change Management process, including testing in a sandbox or UAT environment before production deployment.

4. Verification and Reporting

• Post-Remediation Scanning: Run a targeted scan on the remediated assets to verify the vulnerability has been successfully closed.
• Exception Handling: If a vulnerability persists after remediation, investigate the root cause (e.g., broken dependencies, failed patch deployment) and reset the SLA timer.
• Compliance Reporting: Generate monthly executive reports summarizing the Mean Time to Remediate (MTTR), current open vulnerabilities by severity, and trend lines of risk reduction.

Pro Tips & Pitfalls

• Pitfall - Ignoring False Positives: Manually validate critical findings. Trusting scanners implicitly often leads to "alert fatigue" and wasted engineering hours.
• Pro Tip - Prioritize by Context: A "Medium" vulnerability on an internet-facing database is often more dangerous than a "Critical" vulnerability on an air-gapped printer. Always prioritize based on asset criticality and reachability.
• Pitfall - Patching in Silos: Always coordinate with the DevOps/App Owner teams. Patching can break custom applications; ensure automated roll-back procedures are in place.
• Pro Tip - Automate Remediation: Where possible, leverage configuration management tools (e.g., Ansible, Puppet) to push standardized, hardened configurations to reduce manual toil.

FAQ

Q: How frequently should vulnerability scans be performed? A: At a minimum, full infrastructure scans should occur weekly. However, critical environments or systems containing sensitive data should be scanned continuously or upon the detection of a new high-severity CVE.

Q: What is the recommended timeframe for remediation? A: Industry standard suggests remediation for "Critical" vulnerabilities within 7–14 days, "High" within 30 days, and "Medium/Low" within 90 days. Adjust these based on your internal risk assessment policy.

Q: What should I do if a vendor cannot provide a patch for a vulnerability? A: If a patch is unavailable, document the risk, implement compensating security controls to block the exploit path, and officially log a "Risk Acceptance" in your GRC (Governance, Risk, and Compliance) platform.