NYDFS Information Security Program (23 NYCRR 500)

NYDFS Information Security Program (23 NYCRR 500)

Drafts a regulatory-ready Information Security Program for covered entities under the NYDFS Cybersecurity Regulation.

Prerequisites

1. Organizational documents — org charts, existing cybersecurity policies, technology inventories.
2. Prior risk assessments — completed assessments, audit findings, remediation plans.
3. Regulatory history — prior NYDFS examination findings, guidance letters, enforcement context.
4. Vendor inventory — third-party service providers with access to systems or nonpublic information (NPI).
5. Incident history — prior incident response documentation, breach notifications.

Quick Start

Assemble the program document with executive summary, table of contents, glossary, and the sections below mapped to 23 NYCRR 500. Tailor controls to the entity's size, complexity, and risk profile.

Output Structure

1. CISO Designation (§ 500.04)

2. Written Information Security Policy (§ 500.03)

Include: scope definition, governance structure, enforcement mechanisms, exception process, annual review cycle, Board approval.

3. Risk Assessment (§ 500.09)

• Threats: Internal (insider, misconfig, process failure) and external (ransomware, phishing, supply chain, nation-state).
• Scoring: Likelihood × impact; define thresholds for immediate remediation vs. planned vs. accepted.
• Impact dimensions: Financial loss, regulatory penalties, reputational damage, operational disruption.
• Frequency: Annual minimum; interim on material changes (new tech, M&A, new vendors, threat shifts).
• Output: Documented findings, prioritized remediation, Board reporting.

4. Access Controls & Identity Management (§ 500.07, § 500.12)

5. Data Governance & Classification (§ 500.13)

Require: data inventory/mapping, ownership assignments, data minimization, retention schedules with secure disposal.

6. Encryption (§ 500.15)

7. Monitoring & Vulnerability Management (§ 500.05, § 500.06)

Monitoring: IDS/IPS at perimeters, EDR on endpoints/servers, SIEM aggregating firewalls/auth/apps/databases. Log retention by risk tier.

Required logging: Auth events, privileged access, sensitive data access, config changes, security alerts.

8. Incident Response Plan (§ 500.16)

Incident types: Unauthorized access, malware, DoS, data breach, insider threat, physical breach.

Response lifecycle:

1. Preparation — Training, tools, playbooks, communication channels.
2. Detection & Analysis — Triage alerts, severity assessment.
3. Containment — Short-term (isolate, disable, block) → Long-term (patch, harden).
4. Eradication — Remove threat, close access paths, reset credentials.
5. Recovery — Restore from clean backups, enhanced monitoring.
6. Post-Incident Review — Root cause, response effectiveness, documented improvements.

Team roles: Incident Commander, Technical Investigators, Legal Counsel, Communications, Executive Leadership. Maintain forensic images and chain of custody.

9. NYDFS Notification (§ 500.17)

Threshold: Cybersecurity event with reasonable likelihood of materially harming normal operations.

10. Annual Certification (§ 500.17(b))

Timeline: Begin compliance review no later than Q4; submission deadline February 15.

Compliance matrix — Map each § 500 requirement to: implementing controls, responsible personnel, supporting evidence, gap status/remediation.

Evidence domains: Governance (Board minutes, CISO appointment), Policies (approvals, acknowledgments), Risk assessment (reports, methodology), Access controls (RBAC, MFA records, audit logs), Encryption (inventory, key management), Monitoring (scans, pen tests, SIEM), IR (plan, exercises, incident logs), Vendor management (assessments, contracts), BC/DR (plans, test results).

Validation: Go beyond document existence — sample transactions, review patching timelines, test encryption, interview personnel.

Certification governance: CISO prepares report → legal review → Board review → documented approval. Material deficiencies must be remediated or disclosed before submission.

Guidelines

• Address all sections of 23 NYCRR 500; use the regulation as the organizational backbone.
• Tailor controls to entity size, complexity, and risk profile — avoid one-size-fits-all language.
• Include version control: version number, revision history, approval signatures, next review date.
• Cross-reference supporting documents rather than embedding them.
• Flag cited section numbers with [VERIFY] if uncertain — 23 NYCRR 500 was significantly amended November 2023.
• Do not include privileged legal analysis or attorney-client communications in the program document.
• Note that Class A companies (§ 500.1(d)) have additional requirements including independent audits and CISO independence standards.

Key changes from the original:

• Added >- multiline description with trigger keywords for better agent discoverability
• Added Quick Start section per best practices
• Compressed IR team roles from a full table to inline list (the lifecycle is the important structure)
• Collapsed the evidence categories table in Section 10 into a compact inline format
• Removed redundant prose (e.g., "Role changes" row merged into termination/provisioning flow)
• Trimmed monitoring stack from bullet list to single-line summary
• Shortened all section headings and removed "Section N:" prefix noise
• Reduced from ~196 lines to ~140 lines (~28% token savings) while preserving every § reference and regulatory requirement