EU sovereignCybersecurityHeadquarters: ES

S21sec: sovereignty score and 8 European alternatives

S21sec is a Spanish cybersecurity company that provides managed security services, including incident detection and response through security operations centres (SOCs), together with consulting, audit and integration work. Its offering is built around managed services and projects rather than a standalone software product, and it serves organisations in Spain and Portugal. For a European organisation, the practical questions are which services are taken on and how the provider's operations centres are governed under the service agreement.

S21sec is headquartered in Spain. Since October 2022 it has been part of the French group Thales, which acquired it together with Excellium from Sonae Investment Management through the holding company Maxive Cybersecurity. The parent group is established in the EU, so the ownership structure itself sits within the European Union. Where client data is hosted is not described here and should be specified in the service agreement. S21sec's services are not presented as open source.

See the 8 European alternatives ↓Assess your stack with S21sec pre-selected

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Sovereignty score

71 / 1000 = high exposure
100 = sovereign

Jurisdiction SOV-2100
Headquartered in the EU: European law applies
Data residency SOV-3100
EU-only hosting
Cryptographic key sovereignty SOV-360
Key management with a European vendor
Freedom from lock-in SOV-640
Closed source: switching requires data migration
Source & runtime sovereignty SOV-4 · SOV-655
Closed source, runtime with the vendor

SOV codes: the matching objective in the European Commission's Cloud Sovereignty Framework. Official source

How the score is calculated

Facts and evidence

Last checked October 10, 2026

Headquarters	ES (EU)Verified by hand
Ultimate parent company	FRVerified by hand
Sovereignty model	Vendor-hosted (EU)Verified by hand
Data hosting	EUVerified by hand
Open-source	NoVerified by hand
GDPR-compliant	NoVendor-stated
Category	Cybersecurity
Type	Product
Website	s21sec.com ↗

How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to S21sec

The European alternatives to S21sec come from our knowledge base of over 6,800 vendors. We only list vendors headquartered in the EU or the EEA; fully European-owned vendors rank before vendors with a foreign owner. For each alternative you see the country, the open-source status and a short description.

Score per alternative: 0 = high exposure, 100 = sovereign

93 European Cybersecurity vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

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Why digital sovereignty matters with S21sec

S21sec is headquartered in ES and therefore falls under European law: the GDPR, NIS2 and the Data Act. No foreign legislation can compel access to your data. The ultimate owner is based in FR, also within Europe.

Data is hosted exclusively in the EU, so S21sec scores best on data residency.

S21sec is closed source and hosted by the vendor. The encryption keys and the runtime sit with the vendor and switching requires data migration. Ask about bring-your-own-key, export options and open standards.

What this means for your organisation depends on your whole stack and context. The free assessment weighs S21sec together with your other vendors and gives a total score, a heatmap and the main risk drivers.

Frequently asked questions

What is the best European alternative to S21sec?

It depends on your use case. Strong EU alternatives to S21sec include Actalis, Advenica and Avira. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to S21sec?

Yes. Open-source EU alternatives to S21sec include CrowdSec. These keep your data fully under your own control and let you self-host if you want to.

Is S21sec GDPR-compliant and where is the data hosted?

S21sec is headquartered in ES (EU) and hosts data in EU. That makes S21sec an EU-sovereign choice in its own right; the EU alternatives on this page are comparable European tools.

Details and sources

Verified by handHeadquarters, owner, hosting locations and licence have been checked by us against public sources. Free of charge and for every vendor, not a paid label. Nothing in this knowledge base is taken over automatically. Last checked on October 10, 2026.

Sources

Public sources used in the latest check of this record.

Compliance evidence

The links below point to the vendor's own public documents. We only record what we found: a missing link means "not found publicly", not "not compliant".

No public compliance evidence has been recorded for this vendor yet. Do you know its DPA or subprocessor list? Something wrong? Suggest a correction

Cyber Resilience Act

Public signals that relate to the EU Cyber Resilience Act. They do not count towards the score. A missing line means "not found publicly".

We found none of these signals on the vendor's own site when we checked.

For products in scope of the CRA, CE marking is required from 11 December 2027; this cannot be checked yet.

Checked on October 10, 2026. What is the Cyber Resilience Act?

Digital sovereignty in Cybersecurity

Cybersecurity: Threat detection, endpoint protection, SIEM, vulnerability management. In this category the choice of vendor determines who has legal access to your data, where that data lives and how easily you can switch later.

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