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Why Are Traditional SIEMs Struggling to Keep Up in the Modern Cloud Era?

More than a decade ago, the authors began their careers in security, facing daunting challenges: enterprises were investing in technologies, people, and processes, yet breaches persisted. For two of the authors, that journey included time at Splunk, where they witnessed firsthand how security teams leaned heavily on SIEM platforms to defend against evolving threats. Across their combined experience, one theme was clear that attackers were moving faster, and defenders were struggling to keep up with the scale and speed of the fight.

Today, organizations generate more data than ever, and the strain is felt most acutely in security operations. Security Information and Event Management (SIEM) platforms, once the backbone of enterprise defense, are showing their age. Originally built for log management, many legacy SIEMs are ill-equipped to handle the scale, complexity, and velocity of modern cloud environments.

The Cost Paradox

Exploding log volumes drive SIEM costs sky-high because “most SIEM vendors charge based on the amount of data ingested; usually gigabytes per day or events per second (EPS),” figures that are “tough to predict,” so actual cost “skyrockets” when usage exceeds the estimates. (Source: SC Media) During incidents, the “pricing paradox” kicks in: “The moment you need full visibility during an incident is often when costs spike the most, [teams] face a tough choice to either accept exorbitant overage fees or suppress logs and lose visibility.” (Source: Seceon Inc)

Operational Inefficiencies

False positives overwhelm analysts and slow response. The SANS 2024 Detection & Response Survey reports “64% of respondents identify false positives as a major issue”, with 42% encountering them frequently driving alert fatigue and distracting teams from real threats. (Source: SANS Institute)

Cloud Complexity

Multi-cloud architectures amplify these problems. Each environment generates massive telemetry streams in different formats, at unprecedented speeds. Legacy SIEMs were never designed to handle this level of diversity, leaving significant visibility gaps.

Rigidity and Lock-In

Legacy stacks and proprietary data models create switching friction. NIST notes “Lack of Portability between SaaS Clouds,” where export/import formats may not be compatible and custom workflows and extensions are provider-specific and “not easily transferable.” NIST makes the same point for PaaS—platform services vary widely, so portability requires extra abstraction and often lands you at the “lowest common denominator” of features. More broadly, workload portability depends on standardized interfaces and data formats; without them, moving between providers is difficult and risky. Read more

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