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06/09/2026 5:18 pm
TL;DR: DNS filtering stops connections to known malicious domains before other controls see them, and CyberFOX cites CISA data showing that more than 91% of malware leverages DNS for attacks. The practical issue is not whether DNS filtering works, but whether teams treat it as a complementary control with real-time intelligence and policy granularity.
NHIMG editorial — based on content published by CyberFOX: why DNS filtering is often misunderstood and how it can block threats early
By the numbers:
- According to CISA, more than 91% of malware leverages DNS for attacks.
Questions worth separating out
Q: How should security teams implement DNS filtering across remote and office users?
A: Start with a policy that follows the user and device, not the subnet.
Q: Why does DNS filtering reduce risk before other tools do?
A: Because it acts at the name-resolution stage, before the browser or application reaches the destination.
Q: What are the signs that DNS filtering is too blunt?
A: Frequent help desk tickets, repeated bypass requests, and widespread use of temporary exceptions are strong indicators.
Practitioner guidance
- Map DNS filtering to your prevention stack Place DNS filtering alongside endpoint and perimeter controls so it blocks known bad domains before connection establishment, not as a replacement for other controls.
- Replace static lists with continuously refreshed intelligence Validate that threat feeds, category updates, and policy changes are automatic and timely, because attacker domains change faster than manual maintenance cycles.
- Design an exception workflow before rollout Define who can approve site exceptions, how long they last, and how they are reviewed so granular control does not collapse into an unmanaged allow-list.
What's in the full article
CyberFOX's full blog post covers the practical detail this post intentionally leaves for the source:
- Examples of category-based DNS policies and allow-list handling for common business exceptions
- Guidance on how to tune DNS filtering so it complements firewall and antivirus controls
- Operational arguments for using DNS filtering to reduce incident response load
- The article's own framing of why misperceptions about DNS filtering slow adoption
👉 Read CyberFOX's analysis of why DNS filtering deserves a place in the prevention stack →
DNS filtering: what it means for security teams?
Explore further
06/09/2026 5:19 pm
DNS-layer prevention is still underused because many teams misread visibility as value. Security programmes often reward controls that generate dramatic alerts, but prevention at the name-resolution layer can remove entire attack paths before they become incidents. That changes the control conversation from detection theatre to exposure reduction, which is a healthier security outcome for most environments.
A question worth separating out:
Q: Should organisations rely on DNS filtering instead of firewalls and antivirus?
A: No. DNS filtering is strongest as an early prevention layer, while firewalls and antivirus address different parts of the attack path. The best result comes from layered controls that reduce exposure at multiple points, not from expecting one mechanism to do everything.
👉 Read our full editorial: DNS filtering myths are obscuring a low-friction control
