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October 1, 2025

Penetration Testing Companies in Greece 2025 (Reviewed)

New Greek Law 5160/2024 (NIS2) raises the bar compare Greek pentest firms, pricing, and what to test to stay compliant.

Mohammed Khalil

Mohammed Khalil

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Why is penetration testing important for Greek organisations in 2025?

Stats card showing 2024 internet crime complaints and global average breach cost to emphasize pentesting urgency

Cyber threats are surging worldwide. For example, the FBI reported 859,532 complaints of internet crime >$16 billion in losses in 2024, and the average cost of a data breach hit $4.45 million globally.

Web applications are especially vulnerable 98% of tested web apps had at least one security flaw. In Greece, attackers often target financial, public, and healthcare systems. New regulations like NIS2 Greek Law 5160/2024 force critical businesses to lock down their defenses.

Penetration testing simulates real attacks beyond automated scans to find these hidden bugs before criminals do. It’s an essential part of any 2025 security program to protect data, maintain trust, and avoid costly breaches.

What regulations and standards drive penetration testing in Greece?

Row of standards logos/text showing how Greek pentests map to OWASP, NIST SP 800-115, MITRE ATT&CK, ISO 27001, PCI DSS 4.0, GDPR, and NIS2.

Greek companies face multiple compliance drivers. NIS2 Law 5160/2024 now applies to energy, transport, finance, healthcare, digital services, etc., requiring strong cybersecurity measures. Regular pentesting is implicitly required to demonstrate risk management under NIS2. Likewise, GDPR EU data protection demands appropriate security for personal data, this is often met by documented vulnerability assessments and pen tests see GDPR Art. 32.

ISO 27001 Annex A.12 mandates vulnerability management and security testing for a certified Information Security Management System.

PCI DSS 4.0 explicitly requires annual penetration tests of the Cardholder Data Environment Req. 11.4 covering both internal and external networks. In practice, auditors in Greece will expect pentest reports to align with these rules, so choosing a provider familiar with NIS2/GDPR/PCI frameworks is key.

What types of pentesting services do companies offer?

Matrix showing common service areas in Greece: web, mobile (MASVS), API, cloud, internal/external, red team, and code review

Greek pentest firms offer a full spectrum of security tests:

Web Application & API Testing:

Mobile App Penetration Testing:

Infrastructure & Cloud Testing:

Red Team & Phishing Simulations: For mature orgs, some firms offer adversary emulation or red teaming. This blends cyberattacks with social engineering like phishing to test how well an organization detects and responds. In Greece’s high risk sectors, these exercises can be critical for demonstrating incident readiness.

Who are the leading penetration testing companies in Greece?

Several firms specialize in Greek market pentesting. For example:

DeepStrike Manual Led Continuous Pentesting Platform

DeepStrike homepage showing the slogan 'Revolutionizing Pentesting' on a black background with navigation links for services, resources, company, and pricing

DeepStrike Athens leads with manual expertise and continuous validation through its PTaaS platform, blending human depth with automation for real time risk visibility. The firm’s certified experts, compliance ready reports, and free retesting policy make it a top regional choice for organizations seeking continuous, human driven pentesting.

CENSUS S.A. CREST Accredited Pentesting and Secure Code Review Specialists

CENSUS cybersecurity engineering homepage featuring an image of a quantum computer and tagline 'Quantum-Resilient Security' emphasizing advanced cyber research

CENSUS S.A. is a CREST accredited Greek cybersecurity pioneer, providing penetration testing, red teaming, and code review services with a focus on regulated sectors such as banking and government. With PCI and GDPR expertise, ISO aligned processes, and high technical rigor, CENSUS stands as one of Greece’s most trusted and technically advanced pentesting providers.

TwelveSec Blended Automation + Manual Pentesting Expertise

TwelveSec cybersecurity company homepage showing 'Your Partner in Cyber Security' with categories for security assurance, management, and training

TwelveSec Athens delivers comprehensive, hybrid pentesting services blending automation speed with manual precision. Backed by OSCP certified professionals and a client collaborative approach, TwelveSec stands out among Greek pentesting firms for its ability to scale, adapt, and integrate testing within modern DevSecOps environments.

Secura S.A. & ADACOM Enterprise Scale Cybersecurity with International Partnerships

ADACOM cybersecurity homepage featuring the tagline 'Trust Manage Secure' on a dark blue background, representing managed security and trust services.

Secura S.A. and ADACOM represent two of Greece’s most established cybersecurity consultancies, known for large scale, compliance driven penetration testing and international alliances. With CREST accreditation Secura and official cooperation with OSE and ENISA ADACOM, they bring technical depth, regulatory trust, and enterprise delivery capabilities to Greece’s cybersecurity landscape.

Each provider has strengths: some excel at deep application logic and MASVS aligned app tests, others at large infrastructure/Red Team projects. Reading reviews and comparing service sheets and asking about CREST/OSCP accreditations can clarify who fits your needs.

Why is DeepStrike often considered Greece’s top pentest provider?

How do internal and external penetration tests differ?

Diagram contrasting external perimeter attacks with internal lateral movement and privilege escalation

External Penetration Test:

Internal Penetration Test:

In summary, external tests focus on perimeter security, while internal tests check what happens once that perimeter is crossed. Both are needed for full coverage, especially under standards like PCI DSS which requires testing both. Typically a provider will quote separately for each scope, or offer both as a combined engagement.

How does manual testing compare to automated scanning?

Automated vulnerability scanners like Nessus, OWASP ZAP are useful for quickly finding low hanging fruit outdated software, common misconfigurations, but they have limits. A manual penetration test, by contrast, involves skilled testers creatively chaining exploits and hunting logic flaws. Key differences:

What is Pentest as a Service PTaaS vs traditional pentesting?

Side-by-side comparison of automated vulnerability scanning vs manual penetration testing and when each is used.

Traditional Pentest:

PTaaS Continuous Pentesting:

What factors influence penetration testing costs in Greece Athens/Thessaloniki?

Bar chart with typical 2025 penetration testing price ranges for web/API, mobile (per platform), and Greek mid-size engagements.

There’s no fixed price list, the cost depends on scope and needs. Key drivers: number and type of assets, websites, apps, IPs, complexity, modern tech stacks require deeper testing, and level of access black box vs gray/white box.

For example, a simple external network scan might be a few thousand euros, while a large web+mobile+internal bundle could reach tens of thousands. The experience of the testers matters to teams with OSCP/CREST credentials often charge premium rates but find more issues.

Local factors vendors in Athens or Thessaloniki might have slightly lower day rates than in Western Europe, but you should ensure they speak Greek/English well and understand local laws. Generally, get multiple quotes by sharing your scope and compliance needs. Expect to pay on the order of €5k €30k for most mid size engagements, very high security environments banks, telcos may budget more. Always clarify what’s included reporting detail, retests, integrations to compare fairly.

penetration testing services are no longer optional for Greek organizations in regulated industries, it’s mandated by new laws and expected by customers. The right provider will blend manual expertise with the latest methodologies, while addressing NIS2, GDPR, PCI DSS and other Greek market requirements.

DeepStrike’s team, for instance, offers tailored PTaaS plans with continuous testing, Slack/Jira dashboards, and certified experts to keep your Athens or Thessaloniki infrastructure secure year round.

Branded DeepStrike call-to-action banner inviting Greek organizations to request a PTaaS quote for NIS2/PCI/ISO.

To strengthen your cyber resilience today, contact DeepStrike for a consultation and a detailed quote. Their security consultants can explain how ongoing pentesting fits your compliance ISO 27001, PCI DSS and help plan a test that protects your most critical assets.

Author: Mohammed Khalil, Cybersecurity Architect at DeepStrike. Mohammed has over 15 years of experience in penetration testing and red teaming for Fortune 500 companies. A CISSP/OSCP/OSWE certified consultant, he specializes in translating complex security challenges into practical testing strategies.

FAQ:

External tests assume an attack from outside your network testing internet facing assets to breach the perimeter. Internal tests assume an attacker is already on the inside testing internal systems, like workstations and servers, to see how far a breach could spread. Both are needed external tests to check your front door, while internal tests reveal what happens if the front door is bypassed.

NIS2 Greek Law 5160/2024 and GDPR don’t explicitly say you must do a pentest, but they require robust security measures. In practice, Greek regulators and auditors expect organizations to perform risk assessments and security testing that often take the form of pentests. 

For sectors like energy or finance under NIS2, a professional pentest is now a normal compliance step. GDPR’s Article 32 requires regular security testing, so many firms meet that by including pentesting in their controls.

Look for testers with OSCP, CREST, OSCE/OSWE, GPEN, CISSP, or similar qualifications. CREST accreditation, a UK/EU standard for a firm indicates a certain process maturity. Individual certifications OSCP, OSCE show technical skill. Don’t rely solely on sales claims, ask for bios or verification.

Certified testers not only know how to hack, but also how to document issues for auditors.

For PCI DSS, you must do penetration tests at least annually and after any significant change to your cardholder data environment. ISO 27001 doesn’t prescribe frequency, but expects that you test regularly, commonly once a year or whenever major systems change. 

NIS2 will require appropriate testing schedules as well. Many organizations aim for bi annual to quarterly tests, or continuous PTaaS, especially if they deploy updates frequently.

A vulnerability scan is an automated check that finds known issues like missing patches across systems. It’s lightweight and quick. A penetration test is deeper: it uses both tools and skilled hackers to actively exploit flaws and prove what an attacker could actually do. 

Think of a scan as a health check, while a pentest is a stress test on your defenses. Both have value, but only a pentest shows real attack impact.

Yes. Modern providers like DeepStrike offer integrations so that every code build or deployment can trigger automated scans and notify pentesters via Slack/Jira. For example, a PTaaS plan may run scheduled scans after each commit and have a workflow where developers see findings in real time tickets. 

This DevSecOps integration ensures security is built into the development lifecycle rather than done at the end.

Prepare a clear scope systems, apps, IPs to test and any compliance context PCI, NIS2, etc.. Contact a few reputable firms local and international for proposals. Reputable companies will ask about your environment, provide a proposal, and often sign an NDA before detailed scoping. 

Be wary of very low prices, effective pentesting requires skilled humans. Compare deliverables report detail, retesting policy, timelines to find the best fit for your budget and needs.

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