Penetration Testing for Financial Institutions

The Mandate Is Clear: Test Annually

NYDFS 23 NYCRR 500 requires annual penetration testing for every covered entity, and the population of covered entities is broad. Banks, insurance companies, mortgage companies, money transmitters, premium finance companies, and dozens of other categories of financial services firms licensed by the New York Department of Financial Services are all required to conduct annual penetration testing. For these organizations, the question is not whether to test but how to test effectively and efficiently.

Scoping a Financial Institution Pentest

A well-scoped penetration test for a financial institution covers the systems identified in the entity's risk assessment as presenting the highest risk. Typically this includes:

• External network: All internet-facing infrastructure: web properties, VPNs, email gateways, remote access systems, and any customer-facing portals
• Internal network: Lateral movement from a compromised internal position to domain controllers, financial systems, and sensitive data
• Web applications: Customer portals, online banking platforms, advisor tools, and any application processing financial transactions
• Social engineering: Phishing and vishing assessments targeting employees with access to financial systems and wire transfer capabilities

Documentation for NYDFS Compliance

Grid32 structures penetration test documentation to satisfy NYDFS examiner requests directly. The documentation package includes: an executive summary suitable for board reporting and the annual CEO/CISO certification process, detailed technical findings with severity ratings and remediation guidance, a scope and methodology statement documenting what was tested and how, and an attestation letter confirming the engagement for regulatory file purposes. We retain documentation in a format that supports the five-year retention requirement.

Testing Frequency and Timing

NYDFS requires annual penetration testing with bi-annual vulnerability assessments. For financial institutions with fiscal years ending December 31 and NYDFS compliance certifications due April 15, scheduling penetration testing in Q3 or Q4 of each year provides time for remediation before the certification period. Grid32 works with clients to establish a testing calendar that aligns with their compliance cycle.

A Financial Institution Testing Program

Most covered institutions build a repeatable annual program around the systems their risk assessment flags as highest risk. A typical program looks like this.

Common Findings in Financial Institution Tests

Across financial engagements, the same high-impact issues recur: Active Directory weaknesses that allow rapid escalation to domain control, multi-factor authentication gaps on remote access or privileged accounts, weak internal segmentation between user and server networks, and email configurations that enable wire-fraud impersonation. None are exotic, and all are remediable, which is why annual testing is so effective at closing them. For the full regulatory picture, see our NYDFS requirements guide.

Frequently Asked Questions

How often must financial institutions conduct penetration testing?

Financial institutions covered by NYDFS 23 NYCRR 500 must conduct risk-based penetration testing at least annually, and many test more often based on their risk assessment, significant changes, or examiner expectations.

How is a financial institution penetration test scoped?

Scope typically covers external and internal networks, key applications, and often an email phishing assessment, aligned to the institution's risk assessment. The goal is to test the systems and paths most relevant to protecting customer funds and data.

What documentation do financial institutions need for compliance?

Institutions need evidence of independent annual testing, clear scope tied to the risk assessment, documented findings, remediation tracking, and an attestation suitable for examiners. Grid32 provides reporting that maps to NYDFS expectations.