Threat and vulnerability management

Threat and vulnerability management means you must run a repeatable program that finds threats and vulnerabilities in your scoped environment, evaluates their risk, and drives timely mitigation with proof. Under C2M2, the expectation is operational: defined cadence, clear ownership, documented decisions, and evidence that remediation happens. ¹

Key takeaways:

• Maintain continuous or routine identification of vulnerabilities and threat signals, not ad-hoc scans. ¹
• Triage and prioritize with a consistent method, then track mitigation to closure with documented risk acceptance where needed. ¹
• Keep audit-ready artifacts: inventories, scan results, tickets, exception approvals, and metrics that show the process runs as designed. ¹

A CCO or GRC lead usually inherits threat and vulnerability management as a “security team problem,” then gets pulled in when a customer asks for proof, an audit requests samples, or an incident exposes missing coverage. C2M2 frames this requirement plainly: you must identify, assess, and mitigate threats and vulnerabilities. ¹

Operationalizing that sentence requires decisions that compliance should drive: what’s in scope, what “identify” means for your IT and OT environments, which sources of vulnerability data are authoritative, how prioritization works, what timelines are expected, and what evidence demonstrates the program actually runs. If you cannot show consistent execution, you will struggle in internal control testing and external diligence even if engineers are doing good work informally.

This page gives you requirement-level implementation guidance you can hand to security and infrastructure teams, then use as your compliance test script. It assumes you are applying C2M2 to a defined scope (business unit, function, or OT environment) and you need something you can stand up quickly, run reliably, and defend in review. ¹

Regulatory text

Requirement (C2M2-03): “Identify, assess, and mitigate threats and vulnerabilities.” ¹

What the operator must do:
You need a functioning lifecycle that:

1. Identifies relevant threats and vulnerabilities for the scoped environment (assets, software, configurations, and threat intelligence signals).
2. Assesses them consistently (impact, likelihood, exploitability, exposure, and compensating controls).
3. Mitigates them (patch, reconfigure, isolate, compensate, or formally accept risk) and proves completion with evidence. ¹

This is not satisfied by a policy alone. You need a process that runs on a defined cadence and produces artifacts you can sample in an audit. ¹

Plain-English interpretation

Threat and vulnerability management is your “find, rank, fix, prove” loop.

• Find: know what you have and what’s wrong with it (scanning, monitoring, supplier advisories, threat intel).
• Rank: decide what matters first using consistent rules that your organization can explain.
• Fix: remediate or apply compensating controls, then confirm the issue is actually reduced.
• Prove: keep enough records that an auditor can pick a sample and trace it from detection through closure or approved exception. ¹

Who it applies to

This applies to organizations that have adopted C2M2 for a defined scope and are measuring or improving maturity within that scope. ¹

Entity types called out in C2M2 context include:

• Critical infrastructure operators
• Energy sector organizations ¹

Operational contexts where this requirement becomes “audit-visible”:

• OT environments where patching is constrained and compensating controls must be documented.
• Regulated or customer-assured environments where evidence of remediation matters as much as the technical work.
• Third-party dependencies (software, managed services) where vulnerabilities may sit outside your direct control but still require tracking and mitigation decisions.

What you actually need to do (step-by-step)

1) Set scope and ownership (so the process can be tested)

• Define scope boundaries: networks, plants/sites, cloud accounts, endpoints, servers, applications, and critical third parties that support the scoped environment.
• Assign accountable owners: one owner for the program, plus system/app owners responsible for remediation.
• Define “in-scope vulnerability sources”: scanner outputs, configuration findings, supplier advisories, threat intel relevant to your environment. ¹

Practical control objective: An auditor can tell what is covered and who is responsible without interviewing five teams.

2) Establish your identification mechanisms (continuous monitoring, not sporadic)

Implement “continuous vulnerability and threat monitoring” as an operating expectation, even if some assets must be assessed on a routine schedule rather than real-time. ¹

Minimum identification coverage to operationalize:

• Asset discovery / inventory alignment: scanning results must map to a current asset list; unknown assets become tickets.
• Vulnerability discovery: authenticated scans where feasible, plus container/image scanning and dependency scanning where applicable.
• Threat monitoring: track threat advisories and exploited-in-the-wild signals that affect your technology stack, then translate them into actionable tickets. ¹

Decision point for compliance: Document where scanning cannot run (common in OT) and require an alternate method (maintenance-window scans, passive monitoring, configuration baselines).

3) Standardize triage and prioritization

You need one prioritization approach that engineering teams will follow and compliance can test. Build a short written standard that answers:

• What fields are required in every finding (asset, owner, environment, severity, exposure, evidence).
• How you determine priority (severity plus business criticality plus exposure plus known exploitation).
• When exceptions are allowed and who approves them.

Tip: If teams use different tools, normalize the output into a single queue (ticketing system, GRC workflow, or vulnerability management platform) so you can report consistently.

4) Drive mitigation to closure (or documented risk acceptance)

For each prioritized item, require one of these outcomes:

• Patch/upgrade (preferred)
• Configuration fix (hardening, disable service, reduce privileges)
• Compensating controls (segmentation, WAF rules, isolation, monitoring)
• Risk acceptance with a defined rationale and expiry/review trigger
• False positive with evidence (screenshots/logs, validation steps) ¹

Operationalize closure:

• Closure must include verification (rescans, validation, change record).
• Aging items must escalate to accountable leadership.

5) Measure execution and prove the program runs

Define a small set of metrics that show process health:

• Volume of open findings by priority and by owner
• Aging of findings (oldest items and bottleneck teams)
• Exception volume and upcoming expirations
• Coverage gaps (assets not scanned, scan failures) ¹

Metrics are not the goal. They are your audit defense that the program is operating and improving.

Required evidence and artifacts to retain

Auditors and customers usually ask for sample-based proof. Keep these artifacts in a system of record:

Program governance

• Threat and vulnerability management standard / procedure (versioned)
• RACI or ownership mapping for remediation
• Scope statement and boundary diagrams for covered environments ¹

Identification evidence

• Vulnerability scan schedules or continuous monitoring configuration
• Sample scan outputs (date/time, target scope, results)
• Threat intel/advisory intake records and resulting tickets ¹

Triage and remediation evidence

• Ticket/work items showing: detection source, risk rating, owner assignment, due date, remediation steps, and closure verification
• Change records linked to remediation where applicable
• Exception/risk acceptance forms with approvals and expiry
• Compensating control validation (e.g., segmentation rule, monitoring alert, WAF rule) ¹

Management oversight

• Recurring review meeting notes (security ops, patch governance, OT change board)
• KPIs/KRIs and escalation records for overdue high-risk items

Common exam/audit questions and hangups

Expect these, and pre-build your evidence package:

1. “Show me your scope. How do you know all relevant assets are covered?”
   Hangup: weak inventories and scan coverage gaps.

2. “How do you prioritize remediation?”
   Hangup: inconsistent severity mapping, or “engineer discretion” with no written method.

3. “Provide samples: one critical, one medium finding. Trace from detection to closure.”
   Hangup: missing proof of verification or no linkage between scanner output and ticket closure.

4. “How do you handle OT or uptime-constrained systems?”
   Hangup: undocumented compensating controls and open-ended exceptions.

5. “How do you respond to urgent exploited vulnerabilities?”
   Hangup: no documented intake path for threat advisories and no trackable escalation workflow. ¹

Frequent implementation mistakes and how to avoid them

Mistake	Why it fails in audit	Fix
Running scans but not tracking remediation in a system of record	You cannot prove mitigation	Require tickets for every in-scope high-risk finding and sample-ready closure evidence
Treating exceptions as permanent	Risk accumulates and no reassessment happens	Add expiry dates, re-review triggers, and leadership sign-off
“One-off” threat intel handling via email/Slack	No audit trail	Route advisories into the same queue as vulnerabilities with documented triage
OT patch constraints used as a blanket excuse	Auditors expect compensating controls	Define approved alternatives: isolation, segmentation, monitoring, maintenance-window remediation
Metrics without action	Looks like reporting theater	Tie metrics to escalation and remediation governance actions

Enforcement context and risk implications

No public enforcement cases were provided in the source catalog for this requirement, so this page does not cite specific actions.

From a risk standpoint, the failure mode is predictable: without defined cadence and evidence, exploitable weaknesses can remain in production, and remediation proof will be incomplete during audits, customer diligence, or regulator review. ¹

Practical 30/60/90-day execution plan

First 30 days (stand up the minimum viable program)

• Confirm C2M2 scope and list in-scope environments and asset classes. ¹
• Name a single program owner and define remediation owners by system.
• Inventory the current tools and feeds (scanners, EDR, SIEM, advisory subscriptions).
• Establish the system of record (ticketing/GRC) and minimum required fields for each finding.
• Start routine scanning/monitoring for the highest-value segments first; document gaps and constraints. ¹

Days 31–60 (make it consistent and testable)

• Publish the triage/prioritization standard and exception workflow.
• Implement an intake path for threat advisories so “urgent” becomes trackable work.
• Run a first internal control test: pick samples and trace detection → ticket → fix → verification → closure.
• Establish recurring governance (patch/threat review) with documented minutes and escalation.

Days 61–90 (harden, expand coverage, and automate evidence)

• Expand coverage to remaining in-scope assets; reduce “unknown asset” counts.
• Normalize reporting: open findings by priority, aging, exceptions nearing expiry, coverage gaps.
• Add verification discipline (rescans or validation steps required for closure).
• Prepare an audit binder: policy/procedure, scope, sample packs, and metrics snapshots. ¹

Where Daydream fits naturally: Daydream can serve as the compliance system of record that links scanner outputs, tickets, exceptions, and evidence into a single audit-ready package, reducing time spent assembling samples across tools.

Frequently Asked Questions

Does C2M2 require continuous scanning everywhere?

C2M2 expects you to “identify, assess, and mitigate threats and vulnerabilities,” which is commonly operationalized as continuous or routine monitoring with defined cadence. If some environments cannot be scanned continuously (common in OT), document the constraint and use an alternate method with evidence. ¹

What counts as “mitigation” if we cannot patch quickly?

Mitigation can include configuration fixes, isolation/segmentation, additional monitoring, or other compensating controls, as long as you document the decision and can show the risk is reduced. If you accept risk, retain approvals and a re-review trigger. ¹

How do we prove “assessment” in an audit?

Keep a consistent triage method and show it applied in tickets: severity, business criticality, exposure, and prioritization outcome. Auditors will sample findings and expect to see the rationale documented, not reconstructed from memory. ¹

What evidence is most commonly missing?

Closure verification is the usual gap: teams close tickets without a rescan, validation step, or change record. Require a “verification” field and attach the proof before closure.

How should third-party vulnerabilities be handled?

Track third-party vulnerabilities that affect your environment as first-class findings: record the affected service, supplier advisory reference, mitigation action (patch, config, compensating control), and any dependency on the third party’s remediation. Keep communications and decision records in the same system of record.

Can we treat “false positives” as closed without documentation?

No. Audits expect evidence. Record how you validated the false positive and keep supporting artifacts (tool output, configuration state, or vendor confirmation).

What you actually need to do

Use the cited implementation guidance when translating the requirement into day-to-day operating steps. ²

Footnotes

1. DOE C2M2

2. DOE C2M2 program