Monetary Authority of Singapore Technology Risk Management Guidelines CHN.4.4: Notice on Cyber Hygiene 4.4: network perimeter controls

The FI must implement controls at its network perimeter to restrict all unauthorised network traffic; MAS does not prescribe device types, which depend on the systems, environment and risks (FAQ).

Maintained by Gerard BlokdykVerified against the published standard 31 May 2026Control text last updated 21 May 2026

Other controls in Notice on Cyber Hygiene (FSM-N06 and sister notices) – Monetary Authority of Singapore Technology Risk Management Guidelines

CHN.4.1 Notice on Cyber Hygiene 4.1: secure every administrative account
CHN.4.2 Notice on Cyber Hygiene 4.2: apply security patches within a risk-based timeframe
CHN.4.3 Notice on Cyber Hygiene 4.3: written security standards and conformance for every system
CHN.4.5 Notice on Cyber Hygiene 4.5: malware protection on every system
CHN.4.6 Notice on Cyber Hygiene 4.6: multi-factor authentication for critical-system admins and internet access to customer information

Query this from an agent

The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.

MCP endpoint All Monetary Authority of Singapore Technology Risk Management Guidelines controls