Nobody plans for security drift. It accumulates one reasonable decision at a time.
A development team opens a port in an AWS security group to test an integration. An Azure project goes live with its own firewall rules because the deadline didn't allow time to align them with head office. The on-premises firewall team writes policy one way, the cloud team another. A year later, the organization runs three security models that nobody can compare side by side.
That's multi-cloud drift. It's the most common way hybrid environments end up exposed without anyone making a single bad call.
Where Drift Actually Happens
Drift doesn't show up everywhere at once. It concentrates in four places.
Network access rules. AWS uses security groups and network ACLs. Azure uses network security groups and Azure Firewall. On-premises runs a next-generation firewall. Each has different syntax, different capabilities, and different defaults. A rule that means "block everything except HTTPS from partners" gets written three different ways, and at least one of them eventually diverges.
Inspection depth. Native cloud network controls mostly filter by address, port, and protocol. They don't perform the same deep inspection, IPS, and application-level control that the on-premises firewall applies. Traffic that gets inspected in the data center may pass through the cloud with far less scrutiny.
Web application protection. Public-facing apps in each cloud often get protected by that cloud's native WAF, each with its own rule sets and tuning. The same application deployed in two clouds can end up with two different levels of protection.
Visibility. Logs land in different places, in different formats. When an incident spans the data center and a cloud workload, the investigation starts by stitching data together by hand.
Our engineers at IT Builders see this pattern whenever an organization's cloud footprint grows faster than its security operating model: native controls configured project by project, with no single view of what policy actually applies where.
Not Sure What Policy Applies Where?
A cross-environment review compares firewall rules, inspection coverage, and application protection across your clouds and data center, and shows exactly where they diverge.
One Policy Model, Many Environments
The fix isn't to abandon native cloud controls. Security groups and NSGs still do useful work as a first layer. The fix is to put a consistent enforcement layer on top and manage it from one place.
Fortinet does this by running the same FortiOS operating system in every environment. FortiGate virtual appliances deploy natively in AWS, Azure, and other major clouds, alongside physical FortiGates in the data center and branches. Because they all run the same software, one policy definition means the same thing everywhere. FortiManager then pushes and audits that policy across every environment from one console, and FortiAnalyzer centralizes the logs.
The practical effect: a security team can answer "what can reach this database?" once, for the whole estate, instead of checking three consoles and hoping they agree.
Posture management closes the other half of the gap. Misconfigurations in cloud services themselves, such as a public storage bucket, an overly permissive identity role, or an unencrypted database, sit outside the firewall's view. Cloud-native application protection tools, including Fortinet's FortiCNAPP, continuously scan cloud accounts for these issues and flag drift from the approved baseline.
Protecting Web Applications and APIs
Public-facing applications need a different kind of protection from network traffic. Attacks against them, such as injection, credential stuffing, bot abuse, and API manipulation, look like normal HTTPS requests until you inspect the application logic.
Web Application and API Protection (WAAP) addresses this. FortiWeb combines WAF, API discovery and protection, and bot mitigation, and uses machine learning to model each application's normal behavior so it can flag requests that don't fit. It deploys as a virtual appliance or as a cloud service, which means the same application protection can follow a workload into any cloud rather than changing each time the app moves.
APIs deserve special attention. Many organizations can't produce a complete list of the APIs they expose, and undocumented APIs rarely get the same testing or protection as the main application. API discovery gives the security team that inventory first, so they can protect what they actually have.
Keeping Data Where It Belongs
For organizations in Saudi Arabia, a consistent cloud security model also simplifies data residency. PDPL and NCA requirements govern where certain data may be stored and processed. When one policy framework controls which workloads can reach which data stores, across every cloud and the data center, demonstrating compliance becomes a matter of showing the policy rather than auditing every environment separately.
The Bottom Line
Multi-cloud environments drift because each platform brings its own security model and each project configures it a little differently. The answer is a consistent enforcement layer, one policy language across every environment, centralized management and logging, and application protection that travels with the workload.
IT Builders is an authorized Fortinet Engage Partner holding the Cloud Security specialization. Our engineers audit security policy across cloud and on-premises environments, design a single enforcement model that fits how your teams deploy, and protect the web applications and APIs your business runs on.
Ready to see one security picture across every cloud?
