The answer to this question is shifting in an increasingly clear direction: toward domestic SIEM solutions. Is this choice truly a "nationalist reflex," or does it create tangible, measurable business value? In this article, we examine exactly what organizations using domestic SIEM gain—spanning legal, operational, and strategic dimensions.
What is SIEM, and Why is It So Critical?
To recap briefly, SIEM is a platform that collects, correlates, and makes sense of security events across an organization's network, servers, endpoints, and cloud environments in a single center. Research firm Gartner defines SIEM as a configurable logging system that collects, aggregates, and analyzes security event data from on-premises and cloud environments; it also notes that this system helps respond to events that could harm the organization and meets compliance reporting needs.
In the global market, players like Splunk, Microsoft Sentinel, Google (Chronicle), Exabeam, and Securonix hold leader positions in Gartner's 2025 SIEM Magic Quadrant report. This demonstrates that the SIEM market is both a strategic and competitive field. However, for organizations in Turkey, the picture is not limited to simply "choosing the best technology"; which country's laws, which geography's data center, and which team's support line they will depend on also becomes part of the equation.
It is precisely at this point that domestic SIEM solutions move beyond the classic "products doing the same job" debate and begin to offer tangible, organization-specific gains.
1. Data Sovereignty and National Security Advantage
By nature, the data processed by SIEM is an organization's most sensitive data: user behavior, network traffic, identity credentials, system vulnerabilities, and sometimes even personal data. Storing this data on a cloud server abroad poses a significant risk regarding KVKK (Personal Data Protection Law). According to the Personal Data Protection Authority's guidance on cross-border data transfers, transferring personal data to a country without an adequacy decision requires additional guarantee mechanisms, such as standard contractual clauses, binding corporate rules, or undertakings approved by the Board.
While this situation is not "impossible" in theory, in practice it implies a heavy legal burden and loss of time. Furthermore, current evaluations on the subject emphasize that relying solely on explicit consent for international data transfers is no longer legally sustainable, noting that as of 2026, the Board has focused its audits particularly on cloud computing and SaaS sectors.
For an organization using a domestic SIEM, this debate is largely eliminated. Because log data, event records, and analysis outputs remain within data centers inside Turkey's borders, the question of "cross-border transfer" is ruled out from the start; this provides a clear simplification in terms of both legal risk and operational complexity.
2. Compliance Under the 2025 Cybersecurity Law
Cybersecurity Law No. 7545, which entered into force in Turkey on March 19, 2025, shifted this discussion from a choice to a mandatory obligation. The law mandates that priority be given to domestic and national products in cybersecurity efforts; critical infrastructure providers can only use products and services approved by the Cybersecurity Presidency. The same regulation imposes obligations on covered organizations, such as strong authentication, incident notification, and establishing a cybersecurity officer/unit based on criteria to be clarified by secondary legislation; the 2024–2028 National Cybersecurity Strategy similarly aims to reduce foreign dependency.
In this landscape, using domestic SIEM is no longer just a "good idea" for sectors like energy, banking, telecommunications, and public institutions—it is becoming a regulatory necessity. For more details on three obligations under the law that directly concern SIEM (using authorized vendors, mandatory incident notification, cooperation in audits), penalty amounts, and KVKK's 72-hour notification rule, you can check out our article titled "Cybersecurity Legislation in Turkey and Domestic SIEM."
3. Fast and On-Site Technical Support
In SIEM operations, time means security. A falsely triggered correlation rule, an integration issue with a log source, or a platform failure during a critical alert can each turn into hours of waiting for a resolution. Organizations working with international vendors often face delays due to time zone differences, language barriers, and support requests being routed to teams on different continents.
Working with a domestic SIEM vendor significantly shortens the links in this chain. Collaborating in the same time zone, in the same language, and with a technical team that can usually be contacted face-to-face makes a decisive difference, especially during incident response processes.
4. Fast, Custom-Tailored Organization Adaptation
Every organization's log sources, business processes, and risk profiles are different. Requirements such as integrating logs from a sector-specific application into the SIEM, creating a reporting template tailored to local regulations, or writing a parsing rule sensitive to Turkish character sets may not rank high on the standard product roadmaps of major global vendors.
Thanks to their relatively smaller and more agile team structures, domestic vendors can implement such custom requests within weeks, or sometimes even days. This agility offers a significant operational advantage, particularly for fast-growing organizations or those under regulatory pressure.
5. Predictable Cost Structure Free from Exchange Rate Risks
The vast majority of global SIEM products are sold under USD- or EUR-based licensing models. During periods of intense currency volatility, this can make security budgets unpredictable for organizations, sometimes requiring mid-year requests for additional budget.
Domestic SIEM solutions offering TRY-based licensing largely eliminate this risk. Organizations can reflect their security investments more accurately in their annual budget planning; budget discussions between the CFO and CISO are no longer dependent on exchange rate scenarios.
6. More Accurate Detection with Local Threat Intelligence
Global threat intelligence feeds are undoubtedly valuable, but they are universal. Phishing campaigns unique to Turkey, local banking fraud methods, social engineering attacks with Turkish content, or tactics of regional APT groups often fail to appear early enough—or at all—in major global feeds.
Through close contact with local SOC teams and the national cybersecurity ecosystem, domestic SIEM vendors can learn such local threat patterns faster and reflect them in correlation rules. This lowers false-positive rates while increasing the speed of detecting real threats.
7. Competitive Advantage in Public Tenders and Critical Sectors
The principle of "priority for domestic and national products" introduced by the Cybersecurity Law is now a direct evaluation criterion in public tenders and procurement processes across critical infrastructure sectors. In such an environment, organizations that use domestic SIEM or have a transition plan to domestic SIEM start a step ahead in both audits and partnership/tender processes.
This directly affects not only public institutions but also private sector players who do business with the public sector or fall under the definition of critical infrastructure.
What to Consider When Transitioning to Domestic SIEM?
To fully benefit from the advantages of domestic SIEM, organizations are advised to pay attention to the following points:
● Scalability: Ensure that the chosen platform can scale without performance loss as the organization's log volume grows.
● MITRE ATT&CK Alignment: Inquire about the extent to which correlation rules are mapped to the industry-standard MITRE ATT&CK matrix.
● Integration Capacity: Evaluate how many out-of-the-box connectors are available for existing firewalls, EDR, email security, and cloud services.
● Reference Projects: Look into whether there are live reference projects of a similar scale in a similar sector.
● Support SLAs: Response time commitments during a critical incident must be clearly tied to the contract.
Conclusion: Domestic SIEM is Not a Choice, but Increasingly a Necessity
Until a few years ago, using a domestic SIEM was a symbolic preference, seen mostly as "supporting national technology." Today, the picture has completely changed: when the domestic product priority brought by the 2025 Cybersecurity Law, KVKK's data localization pressure, the need for budget planning free from exchange rate risk, and the requirement for a more accurate response to the local threat landscape come together, domestic SIEM becomes a strategic necessity.
For organizations, the main question is usually no longer "Should we transition to domestic SIEM?", but rather "Which domestic SIEM solution should we transition to, and when?" Organizations that plan this transition early position themselves better both during regulatory audits and in the event of an actual cyber incident.
Frequently Asked Questions
• What is the fundamental difference between domestic SIEM and foreign SIEM?
Technically, the logic of log collection, correlation, and alert generation is largely similar. The real difference emerges in data residency, support language and speed, licensing currency, and ease of compliance with local legislation (KVKK, Cybersecurity Law). Domestic solutions provide distinct advantages to organizations across these four areas.
• Is it mandatory to use domestic SIEM under the Cybersecurity Law?
The law does not impose an absolute requirement on all organizations; however, it stipulates that critical infrastructure providers can only use products and services approved by the Cybersecurity Presidency, and establishes a general principle that priority should be given to domestic and national products. Therefore, in practice, there is strong guidance, especially for organizations in the energy, finance, telecommunications, and public sectors.
• How much does transitioning to a domestic SIEM impact existing infrastructure?
Modern domestic SIEM platforms are designed to offer out-of-the-box connectors for common firewalls, EDR, email security, and cloud services. The transition process can usually be managed without disrupting operations through an inventory of existing log sources, a parallel run phase, and a phased cutover plan.
• Does domestic SIEM make sense for small and medium-sized organizations too?
Yes. In particular, TRY-based licensing and more flexible package options make the cost of establishing a Security Operations Center accessible for SME-sized organizations. Furthermore, the obligation to establish a cybersecurity officer/unit—which will be clarified by secondary legislation under the law—is prompting medium-sized organizations to pull this investment forward.
Next Steps in Selecting a Domestic SIEM
None of the seven gains discussed in this article are independent of one another; when data sovereignty, regulatory compliance, and cost predictability combine, investing in a domestic SIEM also elevates an organization's overall risk management maturity. When determining the right SIEM strategy for your organization, taking inventory of your existing log sources and clarifying your legal obligations based on your critical infrastructure status will be the first steps toward a sound roadmap.