Moving to Amazon Web Services isn’t just a technical decision anymore—it’s become essential for staying competitive. The cloud migration market is projected to grow from $232.51 billion in 2024 to $806.41 billion by 2029, with a CAGR of 28.24%, and AWS leads the pack with roughly a third of the global cloud market. But here’s what nobody tells you at the sales pitch: migration is rarely straightforward, and the cloud brings its own unique security headaches.
When Planning Goes Wrong
A Cloud Security Alliance (CSA) report revealed that 90% of CIOs had faced failure or disruption during their cloud migration journeys. That’s a staggering failure rate for something that’s supposed to make life easier. The culprit? Most organizations treat AWS migration like a purely technical task when it’s actually a fundamental transformation of how IT operates.
Teams often miss the critical step of creating a cloud migration strategy that accounts for application dependencies, data volumes, and business continuity requirements. You can’t just lift your servers and drop them in the cloud—you need to understand what talks to what, how data flows, and what happens when things inevitably break during the transition.
Take Airbnb as a counterexample. After migrating to AWS, they were able to handle massive influx of traffic and bookings by leveraging AWS’s cloud infrastructure to scale resources up or down based on demand. But that success came from meticulous planning, not luck.
The Data Migration Nightmare
Here’s where things get real: moving large datasets to AWS presents challenges including network bandwidth constraints that substantially impact transfer speeds, maintaining data consistency, navigating intricate data dependencies and relationships, and demanding robust encryption protocols throughout.
Think about trying to move terabytes of customer data while your business is running. It’s like changing the tires on a car while driving down the highway. For online data transfer, services like AWS DataSync employ optimized protocols to maximize data transfer speeds, but this method might be insufficient for extremely large datasets or environments with limited bandwidth.
Legacy Applications Don’t Play Nice
Legacy applications often depend on local filesystems or specific network resources with hard-coded configurations that don’t translate well to cloud environments. That ERP system running on Windows Server 2008? It’s going to need serious work before it’s cloud-ready.
The problem compounds when you discover that applications built for on-premise environments may not be directly compatible with cloud infrastructure, potentially requiring significant modifications or complete re-architecting. Sometimes refactoring costs more than the migration saves.
Security: The AWS Achilles’ Heel
Now let’s talk about what keeps security teams up at night. AWS might be secure by design, but that doesn’t mean your implementation will be. AWS data breaches frequently result from incorrect configurations, unauthorized access, and inadequate security measures, with human error being a common cause.
The Misconfiguration Problem
The most embarrassing breaches often come from simple mistakes. In 2017, Accenture accidentally exposed sensitive data due to improperly secured AWS S3 buckets, a mistake that could have allowed attackers to access internal credentials and encryption keys. These aren’t sophisticated attacks—they’re basic configurations that someone forgot to check.
When an S3 bucket is deleted, many organizations forget to remove references to it across all subdomains, and if a subdomain’s DNS records stay pointed to a deleted S3 bucket, an attacker can use subdomain enumeration to identify the issue and simply take over the subdomain. The fix? Keep a spreadsheet. Seriously. Sometimes the best security is boring documentation.
Recent Vulnerabilities That Should Concern You
In January 2025, a ransomware group known as Codefinger targeted AWS users by exploiting compromised AWS credentials, utilizing AWS’s server-side encryption with customer-provided keys (SSE-C) to encrypt data stored in Amazon S3 buckets. The attackers generated their own encryption keys, making decryption impossible without paying the ransom.
In August 2024, Aqua Security unveiled research addressing critical vulnerabilities in six AWS services including CloudFormation, Glue, EMR, SageMaker, ServiceCatalog and CodeStar, with potential impacts including remote code execution, full-service user takeover, manipulation of AI modules, and data exfiltration. AWS patched these quickly, but it highlights how complex cloud services create unexpected attack vectors.
The “Shadow Resource” problem is particularly insidious. Shadow resources are automatically generated by AWS services, often without user awareness—for example, CloudFormation creates an S3 bucket with a predictable naming pattern when creating a new stack. Attackers who understand these patterns can claim buckets before you do.
The SSRF Vulnerability You Can Fix Today
Only version one of the Instance Metadata Service (IMDSv1) is vulnerable to SSRF attacks, so simply update to version two (IMDSv2). If you take one action after reading this article, make it this one. It’s straightforward and eliminates a major attack vector.
The Cost Surprise Nobody Expects
Startups often find the variable cost model of cloud services challenging to predict and manage, with unexpected spikes in usage leading to significant increases in costs that can disrupt financial planning. That $500 monthly bill can suddenly become $5,000 if someone forgets to shut down test environments or misconfigures auto-scaling.
AWS offers more than 200 services with different pricing models, configuration options, and use cases, and teams often struggle to choose the right services for their workloads. Do you need EC2, ECS, EKS, or Lambda? Each choice has different cost implications that might not be apparent until the bill arrives.
How to Actually Succeed
Let’s get practical. Start with a detailed migration roadmap, break down the migration into phases such as discovery, planning, pilot testing, migration, and optimization, and categorize applications using the 6 R’s of migration: Rehost, Replatform, Refactor, Repurchase, Retire, and Retain.
The skills gap is real. Migrating to and managing AWS requires specific skills that may not be present in the current team. You can either train your people (expensive and time-consuming) or partner with experts who’ve done this before. There’s no shame in the latter—it’s usually faster and cheaper.
For security specifically: Implement strong identity and access management policies, use AWS WAF for an extra layer of security protecting web applications from common vulnerabilities such as SQL Injection and XSS, and enable AWS CloudTrail to log all API calls across your infrastructure.
The Bottom Line
AWS migration isn’t impossible, but it’s not the simple lift-and-shift that sales materials suggest. Capital One incurred over $150 million in breach-related expenses after an AWS security incident, including legal fees and fines. That’s the cost of getting security wrong.
The good news? These problems are known and solvable. The organizations that succeed are the ones that plan obsessively, test thoroughly, and never assume that “the cloud is secure” means their specific implementation is secure. AWS provides the tools for security—but you still have to use them correctly.
Remember: Cloud providers aren’t responsible for the security of anything you build in the cloud—AWS is just any other computer network, and you should be just as diligent with the security and privacy of your AWS network as with your internal network.
Most Useful Links
AWS Official Resources:
Security Tools & Guidance:
Research & Analysis:
