# Vulnerability Intelligence

> Use when prioritising CVEs, the user asks "should we patch X first?" / "is CVE-YYYY-NNNNN being exploited?", or wants weaponisation, EPSS, and KEV context combined into a patch-now-vs-later recommendation.

- Skill: `liberty91ltd/vulnerability-intelligence` (Agent Skill)
- Install (CLI): `npx skillmds@latest add liberty91ltd/vulnerability-intelligence`
- Raw SKILL.md: https://api.skillmd.com/api/skills/liberty91ltd/vulnerability-intelligence/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: Liberty91LTD (https://skillmd.com/u/liberty91ltd)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/liberty91ltd/vulnerability-intelligence

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# Vulnerability Intelligence

Not all vulnerabilities are equal. This skill provides a prioritisation methodology that goes beyond CVSS scores.

## Prioritisation Framework

### 1. CVSS (Common Vulnerability Scoring System)
Base score provides a starting point but should NEVER be the sole prioritisation factor.

| Score | Severity | Notes |
|-------|---------|-------|
| 9.0-10.0 | Critical | Immediate attention, but check exploitation status |
| 7.0-8.9 | High | High priority, especially if internet-facing |
| 4.0-6.9 | Medium | Standard patching cycle unless other factors elevate |
| 0.1-3.9 | Low | Lowest priority |

### 2. EPSS (Exploit Prediction Scoring System)
Predicts the probability that a vulnerability will be exploited in the next 30 days (0-1 scale).

| EPSS Score | Interpretation |
|-----------|---------------|
| >0.9 | Very high probability of exploitation — treat as urgent |
| 0.5-0.9 | High probability — prioritise |
| 0.1-0.5 | Moderate probability — evaluate with other factors |
| <0.1 | Low probability — standard cycle |

### 3. CISA KEV (Known Exploited Vulnerabilities)
If a vulnerability is on the CISA KEV list, it IS being exploited in the wild. Patch immediately regardless of CVSS score.

### 4. Weaponisation Assessment

| Stage | Description | Priority Impact |
|-------|-------------|----------------|
| **In the wild** | Active exploitation confirmed | PATCH NOW |
| **Weaponised exploit** | Reliable exploit available (Metasploit, commercial) | Very high priority |
| **PoC available** | Proof-of-concept published (GitHub, blog) | High priority — weaponisation imminent |
| **Technical details** | Advisory with enough detail to develop exploit | Medium — monitor for PoC |
| **Advisory only** | CVE assigned, limited technical detail | Standard priority |

### 5. Combined Prioritisation Matrix

| Priority | Criteria | Action |
|----------|---------|--------|
| **P1 — Emergency** | KEV listed OR in-the-wild exploitation + internet-facing | Patch within 24 hours |
| **P2 — Urgent** | Weaponised exploit available + internet-facing, OR KEV + internal | Patch within 72 hours |
| **P3 — High** | PoC available + internet-facing, OR high CVSS + high EPSS | Patch within 7 days |
| **P4 — Standard** | High CVSS but no exploitation evidence + compensating controls | Patch within 30 days |
| **P5 — Low** | Low CVSS + internal only + strong controls | Next patch cycle or accept risk |

## Vulnerability Assessment Template

```markdown
## Vulnerability Assessment: CVE-YYYY-XXXXX

### Overview
- **CVE**: CVE-YYYY-XXXXX
- **Affected Product**: [Product and versions]
- **CVSS Base Score**: X.X ([vector string])
- **EPSS Score**: X.XX (as of YYYY-MM-DD)
- **KEV Listed**: Yes/No
- **Priority**: P1/P2/P3/P4/P5

### Exploitation Status
- **In the wild**: Yes/No [evidence]
- **Weaponised exploit**: Yes/No [Metasploit module, commercial exploit]
- **PoC available**: Yes/No [GitHub link, blog post]
- **Threat actors exploiting**: [Known actors, if any]

### Exposure Assessment
- **Internet-facing instances**: [Count if known]
- **Internal instances**: [Count if known]
- **Compensating controls**: [What mitigates even without patching?]
- **Detection capability**: [Do we have rules for exploitation of this?]

### Recommendation
[Patch/mitigate/accept risk with justification]

### Sources
[With Admiralty ratings]
```

## Related skills

- **Find vulnerable internet-exposed assets** — `/lookup-shodan search 'product:"<name>" version:<v>"'` and `/lookup-censys search '<CPE>'` for population-level exposure counts; `/lookup-shodan host <ip>` for asset-level confirmation
- **Track exploit availability and weaponisation** — `/lookup-virustotal` + `/lookup-otx` for malware leveraging the CVE; `/lookup-misp search-attributes --type vulnerability --value CVE-YYYY-NNNNN` for prior internal events
- **First-party exploitation evidence** — `/lookup-liberty91 library vulnerabilities --name CVE-YYYY-NNNNN` for the canonical record (CVSS, EPSS, KEV status, CWE ids), then `entity vulnerabilities <id> --section threat-events` for occurrences naming it. An occurrence classed `security-incident` (rather than `vulnerability`) means a **named victim was actually hit** — that is exploitation in the wild, not a disclosure event, and it should move the CVE up the queue
- **Ransomware operators' favourites** — `/lookup-ransomwarelive group-profile <name>` exposes per-group documented exploited vulnerabilities; cross-reference against your inventory
- **Detection authoring** — once exploitation is observed, `/sigma-writing` and `/yara-writing` produce the rules
- **Apply rigor** — `/score-source`, `/apply-tlp`, `/confidence-language`