CyberScale Contextual Severity v1

NIS2 context-aware vulnerability severity classifier. Takes a CVE description, deployment sector, cross-border status, and CVSS score — produces a contextual severity (Critical/High/Medium/Low) that accounts for regulatory sector impact.

Model Description

• Architecture: ModernBERT-base with 4-class classification head
• Training: Mixed synthetic rules + 1,850 human-curated predecessor scenarios (30% weight)
• Confidence: Monte Carlo dropout (20 passes) maps variance to high/medium/low
• Sectors: 19 NIS2 sectors (18 regulated + non-NIS2)

Intended Use

Assess contextual severity of vulnerabilities in specific deployment contexts. A Critical CVSS vulnerability in a non-regulated small business may be Medium contextually, while a Medium CVSS vulnerability in cross-border healthcare infrastructure may be High.

Input format: <description> [SEP] sector: <sector_id> cross_border: <true|false> score: <cvss_score>

Training Data

• Synthetic: 32,000 scenarios from deterministic NIS2 escalation rules (CVEs x sectors x cross-border)
• Predecessor: 1,850 human-curated scenarios from CVE-Severity-Context project (7x oversampled, 30% weight)
• Balance: 8,000 per severity class after balancing

Metrics

Test set (synthetic + predecessor mix)

Predecessor benchmark (1,833 human-curated scenarios)

Valid Sectors

banking, chemicals, digital_infrastructure, digital_providers, drinking_water, energy, financial_market, food, health, ict_service_management, manufacturing, non_nis2, postal, public_administration, research, space, transport, waste_management, waste_water

Usage

from transformers import AutoTokenizer, AutoModelForSequenceClassification
import torch

model = AutoModelForSequenceClassification.from_pretrained("eromang/cyberscale-contextual-v1", num_labels=4)
tokenizer = AutoTokenizer.from_pretrained("eromang/cyberscale-contextual-v1")

text = "SQL injection in login form [SEP] sector: health cross_border: true score: 7.5"
inputs = tokenizer(text, return_tensors="pt", truncation=True, max_length=192)

with torch.no_grad():
    logits = model(**inputs).logits
    probs = torch.softmax(logits, dim=-1)
    label = ["Low", "Medium", "High", "Critical"][probs.argmax().item()]
    print(f"Contextual severity: {label}")

Limitations

• Small-deployment / non-NIS2 scenarios are the weakest (51% accuracy)
• Trained on English descriptions only
• Does not capture sub-sector deployment context (e.g., clinical vs billing system in healthcare)

Citation

Part of the CyberScale project — multi-phase cyber severity assessment MCP server.