ISO 27001 and DNS Security Requirements in 2025 | DNSFilter

Why DNS Security Matters for ISO 27001 Certification

DNS security is more than just a technical concern—it’s a pillar of ISO 27001 compliance. As businesses work to protect sensitive data, secure network infrastructure, and meet regulatory requirements, DNS security solutions play a critical role in achieving ISO 27001 certification and ensuring compliance with evolving security standards.

Based on the ISO/IEC 27001 standard, organizations must strengthen their DNS network security to prevent cyber threats that exploit domain name resolution vulnerabilities. Cybercriminals frequently target DNS infrastructure with attacks like DNS tunneling, cache poisoning, and domain hijacking, leading to data breaches, financial loss, and reputational damage. Without robust DNS security measures, businesses risk falling out of compliance with ISO 27001’s information security management system (ISMS) requirements.

ISO 27001 Certification Now Requires Stronger DNS Security

Historically, ISO 27001 certification has focused on network security at a broad level. However, to be compliant with ISO 27001:2022 in 2025, businesses must now take a proactive approach to DNS security, implementing network content filtering, DNS encryption, and AI-driven threat detection to protect against cyber risks that compromise domain integrity.

Understanding ISO 27001:2022 and Its Impact on DNS Security

What is ISO/IEC 27001 and Why Does it Matter?

ISO/IEC 27001 is the leading global standard for information security management systems. It provides a structured framework for organizations to identify, assess, and mitigate cybersecurity risks, ensuring data protection, regulatory compliance, and resilience against cyber threats.

For businesses handling sensitive information, achieving ISO 27001 certification demonstrates a commitment to robust security practices, improving trust with customers, stakeholders, and regulators. However, as cyber threats evolve, ISO 27001 guidelines are continuously updated to address new vulnerabilities—and DNS security is now a key focus.

How ISO 27001:2022 is Changing DNS Security Requirements

The ISO 27001:2022 updates introduced enhanced security controls related to DNS network security and threat mitigation. The primary changes include:

• Increased focus on securing network communications to prevent data interception and DNS hijacking
• Stronger emphasis on DNS filtering and domain monitoring as part of cyber resilience planning
• Reinforced controls for DNS encryption (DoH/DoT) to protect against man-in-the-middle attacks

These updates mean that organizations must enhance DNS security policies, deploy advanced DNS filtering solutions, and improve monitoring systems to align with ISO 27001:2022 compliance standards prior to the deadline (October 31st, 2025) if they want to maintain ISO 27001 compliance.

Key DNS Security Controls Required Under ISO 27001:2022

The ISO 27001:2022 updates introduce security controls that directly impact DNS security strategies. 

Here’s what matters most:

Why These Controls Matter for Businesses

Neglecting DNS security measures in line with ISO 27001:2022 isn’t just a compliance risk—it’s an open door for cyber threats. Organizations that don’t prioritize DNS security could face: 

• Non-compliance penalties under ISO 27001 certification audits
• Increased exposure to DNS-based cyber threats, including phishing, malware, and DNS tunneling
• Business continuity risks due to unsecured DNS infrastructure being exploited by attackers

By implementing AI-powered DNS security solutions and advanced network content filtering, organizations can meet ISO 27001 guidelines while enhancing their overall cybersecurity posture.

4 Key DNS Security Changes Organizations Must Make for ISO 27001 Compliance

1. Stronger DNS Threat Detection and Response
   • DNS traffic monitoring will become mandatory for spotting anomalies
   • AI-driven DNS filtering will be required to block emerging cyber threats in real time
     
     
2. Mandated DNS Encryption (DoH/DoT)
   • Organizations will need to encrypt all DNS queries to prevent data leaks, DNS hijacking and spoofing
   • DNS over HTTPS (DoH) and DNS over TLS (DoT) will be required for secure communications
     
     
3. Integration of DNS Security into Incident Response Plans
   • DNS security logs will need to be continuously monitored for suspicious activities with forensic investigations
   • Automated security alerts for DNS tunneling, cache poisoning, domain hijacks, and phishing domains to maintain compliance standards
     
     
4. Expanded Use of AI-Driven DNS Security Solutions
   • ISO 27001 certification audits will require evidence of active threat prevention
   • Machine learning-based DNS filtering will become the standard for detecting malicious domains and quickly evolving threats

Strengthen Your DNS Security for ISO 27001 Compliance

The ISO 27001:2022 updates have introduced stricter DNS security and web filtering guidelines. Organizations must take action now to secure their DNS infrastructure and maintain compliance in the face of evolving cyber threats.

• Protect your business from DNS-based cyber threats
• Ensure ISO 27001 certification with AI-driven DNS security solutions
• Try a free trial of DNSFilter’s advanced DNS security solutions today

Don’t wait until compliance deadlines arrive—proactively secure your DNS infrastructure and stay ahead of evolving cyber threats.

Stay secure, stay compliant, and stay ahead.