Endpoint and security-platform licensing bills per endpoint and per module, and modern XDR suites add data-retention tiers on top. Commercial EDR vendors, CrowdStrike Falcon, SentinelOne, Symantec Endpoint Security (now under Broadcom), and Trend Micro, all price per seat, gate features behind tiers or add-on modules, and layer renewals and minimums on top, so the bill compounds as a fleet grows. Open stacks, Wazuh (XDR/SIEM), CrowdSec (collaborative IPS), osquery (fleet visibility), can cut that spend, but security migrations demand zero coverage gaps, so they run in rings with an extended dual-run.
Detection is not prevention
The one thing to be honest about before you start: Wazuh is primarily a detection, XDR, and SIEM-style platform, not a like-for-like replacement for a commercial EDR’s active, autonomous blocking. A Wazuh manager plus agents gives you rule-driven detection, file integrity monitoring (FIM), security configuration assessment (SCA), vulnerability detection, and scripted active responses, and it integrates cleanly with a SIEM. What it does not do is autonomously prevent and quarantine the instant a threat executes the way a next-gen EDR does. Most teams therefore pair Wazuh with OS-native prevention, the built-in antivirus and host controls, for active blocking, and use Wazuh as the detection, correlation, and response brain above it. Design that split before you deploy a single agent, or you will remove the incumbent and leave a prevention gap.
Map what the incumbent enforces today
Catalog endpoints and OS mix, detection policies, exclusions, and current detections; map SIEM/SOAR integrations and active-response actions; and note compliance requirements (the new stack must satisfy the same controls).
Deploy and recreate
Stand up the manager/console and prepare agent packages for config-management deployment. Recreate detections, policies, and exclusions on the new platform, none of it exports from the incumbent, so you reimplement intent rather than copy settings. Map the source vendor’s policies to Wazuh rules, FIM, and SCA, integrate the platform with your SIEM and threat intel, and baseline endpoint performance impact on a pilot ring before scaling. Start from the out-of-the-box rulesets and CIS benchmarks and tune to your environment rather than porting every incumbent setting one-to-one.
Ringed rollout & dual-run
Roll out agents ring-by-ring (pilot → broad), running the new agent alongside the incumbent EDR so you never lose coverage. Tune false positives at each ring. Validate detections with safe tests (EICAR / atomic red-team) and confirm active-response works. Only after a ring validates do you remove the old sensor there.
Confirming coverage before you retire a sensor
Detection tests, policy/exclusion verification, SIEM event-flow checks, and performance impact are the acceptance bar, and where you rely on OS-native prevention, confirm it is installed and active on every host before you retire the incumbent. If conflicts or coverage gaps appear, halt the rollout and remove the new agent on affected rings, keep the incumbent active until detections validate. Retire the old sensor ring by ring as each clears, never estate-wide at once.
Where these rollouts usually go wrong
Watch for agent conflicts (two EDRs on one host can fight); stagger installs and test thoroughly on the pilot ring. Keep the SOC in the loop so alert routing isn’t dropped mid-migration. Budget for the two things that actually consume the schedule, indexer capacity planning and rule tuning, because event volume drives storage and default rules are noisy until you tune them. And remember the staffing shift: a commercial EDR’s managed hunting and turnkey prevention become your team’s responsibility on an open stack, so scope that capacity honestly before committing.
Use the TCO calculator to model a per-endpoint comparison, then subtract the infrastructure and detection-engineering time the incumbent suite was quietly covering.