Independent Security Partner since 2005
Defending your future.
Today.
Security built for a world where attackers use AI. DEFION combines offensive security expertise with AI that continuously detects, validates, and challenges your defenses. You see what’s happening in minutes and act before attackers get in.
Attackers already use AI to increase the speed and scale of cyberattacks. DEFION combines offensive security expertise with AI-driven analysis to help organisations respond with the same level of visibility, validation and speed. Active Defense means threats are hunted proactively, controls are continuously tested and response starts before incidents escalate.
DEFION in numbers
100+ specialists.
Two offices.
One team.
Zoetermeer and Barcelona. Real people, senior expertise. No offshore support, no call-center triage. When you call DEFION, you reach the engineer who can actually help.
Independent since 2005. Still driven by the people who founded it.




From tech and compliance
to crisis. One partner.
No juggling five vendors for five problems. One team that covers your entire security posture, from advisory to 24/7 monitoring and crisis response.
Independent.
AI-accelerated.
20 years proven.
You get advice without a hidden sales agenda. DEFION doesn't sell products, only protection. That means our recommendations are always in your interest.
From boardroom to server room, 24/7 monitoring and AI-accelerated pentesting. One partner for your entire attack surface: IT, OT, and IoT.
About DEFION →Faster detection.
Less noise.
Better decisions.
You only get alerts that matter. No flood of false positives, no overwhelmed security team. Our technology filters the noise, our experts make the calls.
The result: threats detected in minutes instead of days. And when it counts, there are always people ready who know what to do.
Alert within 4 minutes
No hours or days waiting for an alarm
Only what matters
Your team sees relevant alerts, not thousands
Pentest in 24 hours
First vulnerabilities same day, not after weeks
Experts who decide
No automated guesswork, real human judgment
What we see right now. Week 23 — 3 June 2026
Week 23, 2026 · Updated June 3, 2026
Our TI team monitors 40+ sources 24/7. These are the most relevant threats for European organizations — updated June 3, 2026.
TheGentlemen ransomware deploys BYOVD to kill EDR tools before encryption - 500% surge in NL victims
TheGentlemen ransomware disables EDR via BYOVD before encrypting, with a 500% surge in EU victims. Exploits FortiGate CVE-2024-55591 for initial access. Action: validate EDR and patch FortiGate immediately.
June 3, 2026 · Confidence: High
Read more →Supply chain attack: 3,800 GitHub repositories compromised, 84 npm packages backdoored
3,800 GitHub repos compromised and 84 npm packages backdoored. CISA confirms ransomware linkage. Attackers use dev environments as the entry point to production. Action: audit npm dependencies and implement SBOM.
June 3, 2026 · Confidence: High
Read more →Data extortion without encryption: 38% of ransomware attacks now skip encryption entirely
38% of 2026 ransomware attacks exfiltrate data without encrypting, bypassing backup recovery strategies. Qilin and DragonForce lead this shift in EU targets. Action: implement DLP and update IR plans for data extortion.
June 3, 2026 · Confidence: High
Read more →We speak your language.
Newsroom
AZ and DEFION Security: Official Supplier for Optimal Data Protection
AZ and DEFION enter into a multi-year strategic partnership as Official Supplier to strengthen the club's digital resilience. DEFION protects the valuable data AZ uses for performance on and off the pitch.
CVE-2026-31431 ("Copy Fail"): Critical Linux Privilege Escalation Vulnerability Explained
CVE-2026-31431 ("Copy Fail") is a Linux kernel vulnerability enabling stealthy privilege escalation to root. Learn about the impact, affected systems, and mitigation steps.
SURF Deployment: DEFION and DTX Secure 75+ Education and Research Institutions
DTX and DEFION begin rolling out MDR services for SURF. More than 75 Dutch universities, polytechnics and vocational colleges receive 24/7 protection against cyberattacks.
Ready to make your
security AI-proof?
Talk to one of our experts. No obligations, no sales pitch: an honest conversation about your situation.
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