What is AWS security?
Amazon Web Services Security or AWS security in short, refers to a comprehensive set of tools, services, and practices offered by Amazon Web Services (AWS) to safeguard cloud environments. These solutions ensure data protection, applications, and workloads running on the AWS cloud while adhering to stringent AWS security and compliance standards.
Why this matters right now: IBM’s Cost of a Data Breach Report[1] 2026 puts the global average cost of a data breach at $4.99 million, a 12% year-over-year increase and a record high. Verizon’s 2026 Data Breach Investigations Report[2] adds a cloud-specific warning: in a snapshot of cloud accounts across its dataset, 37% of organizations had an admin account with MFA disabled on an infrastructure-as-a-service (IaaS) offering, and the root cause behind many of the year’s most publicized cloud-based, third-party breaches came down to exactly that, missing or misconfigured MFA and excessive access permissions, not a sophisticated exploit.
AWS employs a shared responsibility model, also referred to as AWS Shared Responsibility and Security, which makes it secure.
With shared responsibility, amazon web services security focuses on securing the cloud infrastructure’s security, while customers are responsible for security in the cloud. This allows users to have a secure, scalable, and flexible environment customized for leveraging the actual needs of an organization.
AWS Security Features:
- Identity and Access Management (IAM): Enables controlled user access and role-based policies.
- Encryption: Provides services such as AWS Key Management Service (KMS) for encrypting sensitive information.
- Threat and anomaly detection: Cloud services such as Amazon GuardDuty look for suspicious activity.
- Network Protection: Virtual Private Cloud (VPC) and AWS Shield provide robust network defenses.
- Cost and Resource Visibility: AWS Cost Explorer and Trusted Advisor support AWS cost optimization best practices alongside security controls, since unused or overprovisioned resources widen the attack surface.
How to Secure AWS Cloud Infrastructure Effectively: Where Most Gaps Start
Before the 15 practices below, it helps to know where AWS environments actually break down, based on the most current breach data available. Three patterns account for most of the damage:
- Unpatched, internet-facing services: Verizon’s 2026 DBIR found that exploiting a known vulnerability is now the single most common way attackers get in, responsible for 31% of breaches, up from 20% the year before and the first time in the report’s 19-year history that it has overtaken stolen credentials. Compounding the problem, only 26% of critical vulnerabilities tracked in CISA’s Known Exploited Vulnerabilities catalog were fully remediated by organizations in 2025, down from 38% the year before, and the median time to fully patch one rose to 43 days.
- Identity and permission sprawl: Verizon’s researchers describe excessive privileges in cloud environments, across IaaS, PaaS, and SaaS alike, as a pervasive issue, and their cloud account snapshot found 37% of organizations had an admin account with MFA disabled on an IaaS offering.
- Third-party and vendor access: Breaches involving a third party grew 60% year over year and now make up 48% of all breaches. Only 23% of third-party organizations in Verizon’s dataset had fully remediated missing or misconfigured MFA on their cloud accounts, and weak passwords or permission misconfigurations took a median of nearly eight months to resolve.
None of these are exotic attacks. They are the same gaps AWS’s shared responsibility model puts on the customer’s side of the line, which is the practical answer to how to secure AWS cloud infrastructure effectively: treat identity, patching, and third-party access as the first three things to get right, not the last three.
15 AWS cloud security best practices
1. Plan and Define a Security Baseline
An effective AWS security solution starts with planning and the setting up a security baseline. Understand the compliance requirements, potential risks, or even focus on the needs for your AWS environment. Use industry standards such as CIS Benchmarks for cloud security. A baseline is also where AWS architecture best practices and AWS infrastructure security best practices start, since a misconfiguration written into the baseline gets copied into every workload built on top of it.
Fidelis Halo®, CNAPP, can help your organization by consistently evaluating the AWS security posture of your AWS cloud environment, identifying and reporting misconfigurations, and suggesting what can be done to conform to baseline standards.
2. Establish Strong Identity and Access Management (IAM)
Implementing a well-defined Identity and Access Management (IAM) policy is a key to having a secure cloud environment. With IAM, users can set more specific permissions, meaning users, groups, and roles only have access to the resources and actions that they absolutely need to work. Start with implementing precise IAM policies in place to reduce over-permissioning.
Verizon’s 2026 DBIR calls out excessive privileges in cloud environments as a pervasive issue across IaaS, PaaS, and SaaS alike, and notes that authentication, secret management, and MFA configuration are the strongest points of attention for any cloud environment. In practice, an over-permissioned IAM role often gives an attacker most of what they need without exploiting a single vulnerability. This is rarely deliberate. Broad permissions usually get granted to unblock a deadline and are never revisited once the project ships, which is exactly the kind of drift that shows up as an exploitable gap a year later.
- Implement the Principle of Least Privilege: Assign permissions on a need-to-know basis to minimize risk of misuse or error.
- Force Strong Passwords: Organizations should have strong password policies so that passwords are complex, difficult to guess, and are periodically changed.
- Regularly Rotate Access Keys: Rotate your access keys every 90 days and use the IAM credentials report to monitor user credentials and to proactively address risks.
- Centralize Access with AWS IAM Identity Center: Use AWS IAM Identity Center (formerly AWS SSO) to manage workforce access to multiple AWS accounts from a single place, reflecting current AWS sso best practices and cutting down on long-lived credentials.
- Frictionless Operation at Any Scale
- Rapid Issue Remediation
- Seamless DevSecOps Automation
3. Use Multi-Factor Authentication (MFA)
Protect accounts by enabling MFA for all users. AWS provides virtual MFA devices that integrate seamlessly with IAM. Ensure that the root account has always enabled MFA.
This is not a formality. Verizon’s 2026 DBIR found that 37% of organizations had an admin account with MFA disabled on an IaaS offering, and among third-party cloud accounts specifically, only 23% had fully remediated missing or misconfigured MFA, with the remaining findings taking a median of almost eight months to resolve.
4. Secure the Root Account
The root account has unrestricted access to your AWS cloud environment and should only be used for critical operations. Limit its use and create individual IAM accounts with administrative privileges. Apply stringent AWS security controls like MFA, activity monitoring, and IP address restrictions.
5. Data Protection at Rest and in Transit
Sensitive data in AWS should be encrypted to make it unreadable by an unauthorized user, a core requirement across both AWS data security best practices and AWS s3 security best practices. Use AWS Key Management Service (KMS) to manage keys and HTTPS for data transmission. To help ensure AWS data security, Fidelis CNAPP solution continuously monitors configurations, identifies misconfigured storage, and flags potential data exposure risks.
6. Continuous Threat Detection and Remediation
Implement tools like Amazon GuardDuty, to look for unusual account activity, such as API anomalies, malicious IP traffic, or detections of privilege escalations. Consistent AWS cloud security monitoring is what turns an isolated alert into an early warning, especially given how much faster attackers now move from a disclosed vulnerability to active exploitation.
Fidelis Halo® complements AWS threat detection with advanced behavior analytics and contextual intelligence, enabling faster response to suspicious activities and tailored threat remediation across multi-cloud environments.
7. Adopt Zero Trust Principles
In Zero Trust, no user or entity is trusted by default, even from inside the network. Use strong identity verification, least privilege access and continuous monitoring, the same principles that underpin modern AWS network security design. Most teams that skip this don’t disagree with the principle, they just default to trusting anything already inside the VPC, which is precisely the assumption attackers rely on once they get past the perimeter once.
8. Monitor Activity with AWS CloudTrail
AWS CloudTrail captures and logs all API calls made in your AWS environment. Use it to track changes, monitor user activities, and investigate anomalies. Integrating Fidelis Halo® CNAPP with CloudTrail amplifies AWS security by identifying potentially malicious activities, providing granular insights, and automating compliance reporting.
9. Enforce Robust Network Security
AWS allows fine-grained traffic control with Security Groups and Network ACLs. Use these to restrict unauthorized access and manage traffic flow to and from resources.
- Configure Virtual Private Clouds (VPCs) to segment workloads and improve isolation.
- Fidelis Halo® CNAPP can be instrumental in visualizing traffic, detecting unusual patterns, and automating responses to potential intrusions.
A security group left open on the wrong port is one of the simplest AWS misconfiguration risks for an attacker to find and one of the cheapest to fix, which is why AWS security group best practices tend to deliver the fastest return of anything on this list.
10. AWS Cloud Storage Security and Data Backups
Ensure that storage resources such as Amazon S3 buckets are secured against unauthorized access. Avoid public access unless explicitly required, and define bucket policies that restrict permissions. Enabling S3 Block Public Access at the account level is one of the most direct AWS s3 security best practices available and closes off one of the most common AWS misconfiguration risks in a single setting.
Public buckets rarely happen on purpose, they’re usually left open during testing or a one-time data share and never locked back down, which is why an account-level default is more reliable than trusting every bucket policy to be set correctly by hand. Enable automated backups for resources like Amazon RDS to ensure business continuity in case of data loss. Fidelis CNAPP solution helps monitor storage configurations and prevents inadvertent exposure of sensitive information.
11. Conduct AWS Cloud Security Assessments
Regularly scan your AWS environment for vulnerabilities with tools like AWS Inspector. These scans help identify outdated software, unpatched instances, and configuration issues. Fidelis CNAPP solution goes further by providing prioritized remediation insights and tracking AWS security posture across hybrid and multi-cloud deployments.
12. Patch and Update Systems Regularly
Outdated instances and cloud services often expose vulnerabilities that attackers exploit. Implement a routine patching schedule to ensure your systems are up to date with the latest security releases.
Patching capacity, not awareness, appears to be the real gap. Verizon’s 2026 DBIR found that only 26% of critical CISA KEV-listed vulnerabilities were fully remediated by organizations in 2025, down from 38% the year before, with the median time to full remediation rising to 43 days. Folding patch management into CI/CD pipelines is one of the few approaches that scales fast enough to keep up, and it’s a practical, working example of AWS devops security best practices rather than a theoretical one.
Use AWS Systems Manager Patch Manager or Fidelis CNAPP solution for centralized tracking and automated patch management.
13. Enable Real-Time Threat Intelligence Feeds
Threat intelligence enables you to stay one step ahead of evolving attack techniques. While AWS does offer integrated feeds, combining them with CNAPP solutions like Fidelis Halo® can enrich analytics, provide real-time context, and empower effective actionable intelligence to reinforce defense.
Without that context, an alert is just noise: knowing whether a flagged IP is a known scanner or an active campaign is what turns a GuardDuty finding into a decision to act now instead of watching and waiting.
14. Automate Security with cloud Infrastructure as Code (IaC)
Standardize cloud security by using tools like AWS CloudFormation to define resource configurations as code. This approach reduces manual errors and ensures consistent AWS security standards across environments. It underpins AWS devops security best practices and AWS architecture best practices at scale: every environment is provisioned from the same reviewed template instead of hand-built and left to drift.
Fidelis CNAPP solution can analyze cloud Infrastructure as Code templates for compliance and flag risks before deployment.
15. Conduct Regular Security Reviews
Review your AWS environment periodically to ensure adherence to security policies and identify potential gaps. Use AWS Trusted Advisor for recommendations. Fidelis CNAPP solution complements these efforts by continuously tracking your organization’s compliance posture and suggesting improvements tailored to your AWS cloud security architecture.
Inculcating these AWS cloud security best practices can harden your cloud security against unauthorized access. Beyond implementing these AWS cloud security best practices, organizations should also consider using tools to supplement IAM management, such as Fidelis CNAPP, that are capable of detecting misconfigurations and providing visibility and controls to help protect identities across cloud resources.
AWS Cloud Security Best Practices for Migration and Containers
Security requirements shift again once workloads move into AWS or run inside containers. Following AWS cloud migration best practices means classifying data and validating IAM permissions before a workload goes live in AWS, not after, so the same permission sprawl described above is not simply carried into the cloud.
Containerized workloads bring their own version of AWS workload security risk, from vulnerable base images to overly permissive task roles. AWS container security best practices call for scanning images before deployment, applying least privilege to ECS and EKS task roles, and monitoring runtime behavior for drift. Fidelis Container Secure™ covers this same lifecycle end to end: build-time image scanning to catch a vulnerable base image before it ships, and runtime protection to catch a task role or workload behaving outside its expected pattern after deployment, the same detect-plus-context approach Fidelis Halo® applies elsewhere in this guide.
10 Common Mistakes to Avoid in AWS Security
In order for your AWS environment to be secure, there are AWS cloud security best practices to follow, as well as common mistakes to avoid. To help, here are some mistakes to look out for and what to do to avoid them:
Using the Root Account for Routine Activities
The root account has full administrative privileges and should be reserved for critical tasks. Using it regularly increases the risk of accidental misconfigurations or AWS security breaches. Instead, create IAM users with specific roles and enable Multi-Factor Authentication (MFA) for the root account.
Misconfiguring Security Groups and S3 Buckets
Your AWS environment is vulnerable to attack if you have overly permissive security groups or public S3 buckets. Regularly audit the rules for the AWS security groups and avoiding granting wide access. Similarly, restrict S3 bucket access unless explicitly needed and configure proper bucket policies.
Neglecting Identity and Access Management (IAM)
Poorly defined IAM roles or broad permissions can lead to unauthorized access. Always apply the Principle of Least Privilege, require strong passwords, rotate access keys regularly, and monitor IAM credentials.
Ignoring Security Monitoring and Threat Detection
Without proper monitoring, security incidents can go unnoticed. Failing to enable services like AWS CloudTrail or Amazon GuardDuty can leave your environment blind to anomalies and attacks. Use tools like Fidelis Halo® for enhanced visibility and proactive threat detection.
Delaying Patch Management
Unpatched instances and cloud services are a common entry point for attackers, and 2026 breach data backs this up directly: vulnerability exploitation is now the top initial access vector at 31% of breaches. Ensure timely updates to avoid exposing vulnerabilities. Automate this process using AWS Systems Manager or similar tools.
Overlooking Shared Responsibility
AWS operates under a shared responsibility model, meaning AWS secures the cloud infrastructure, but you must secure what’s in the cloud. Misunderstanding this split can leave critical gaps in your AWS cloud security strategy, and it is exactly the gap Verizon’s researchers point to when describing why so many 2025’s highest-profile cloud breaches traced back to missing MFA or excessive permissions rather than a novel attack technique.
Failing to Conduct Regular Security Reviews
A static AWS security setup cannot keep up with evolving threats. Neglecting periodic reviews of configurations, policies, and logs can leave your environment vulnerable to exploitation.
Overlooking Automation for AWS Security Tasks
Relying heavily on manual processes increases the risk of human error. Leverage Infrastructure as Code (IaC) and automated monitoring tools to maintain consistency and reduce risks.
Not Planning for Incident Response
Failure to plan for potential breaches can lead to delayed responses. Develop a detailed incident response plan and test it regularly to ensure rapid action when needed.
Utilizing AWS-native tools and AWS security best practices in conjunction with the advanced features of the Fidelis CNAPP solution can build a multi-layered response strategy that secures your cloud environment while ensuring compliance and reducing the risk of breaches.
Outpace Adversaries with Limitless Cloud-Scale Security
- Cloud-friendly Deployment
- Hyper-scalable Workload Protection
- Agentless Cloud Posture Management
In conclusion
None of the 15 practices above are exotic. What separates a secure AWS environment from an exposed one is rarely sophistication, it’s consistency: patching on a schedule instead of a backlog, reviewing IAM permissions on a calendar instead of after an incident, and treating the shared responsibility model as a working checklist rather than something read once at onboarding. That is the pattern the 2026 breach data keeps pointing back to, and it’s the fastest place to start if you are prioritizing rather than doing all 15 at once.
It’s important to take a proactive approach by following AWS cloud security best practices and avoiding common mistakes to securing your AWS environment in order to mitigate potential vulnerabilities. Fidelis Halo® is a Cloud Native Application Protection Platform (CNAPP) that empowers organizations with a range of tools to enhance AWS security, including real-time threat detection, automated compliance, and advanced cloud security posture management. Fidelis Halo® gives you the ability to protect your entire cloud infrastructure now and scale seamlessly as your workloads in AWS grow.
Frequently Asked Questions
Can you explain the importance of AWS security services for data protection?
Services like KMS, GuardDuty, and IAM protect data in storage, in transit, and during processing. Without them properly configured, data in S3, RDS, or EBS is exposed to unauthorized access and compliance violations.
How can I ensure my data is secure in AWS considering shared responsibilities?
Know exactly where AWS’s job ends and yours begins. AWS secures the underlying infrastructure; you secure your IAM configuration, encryption, network, and patching. Audit your side of that split regularly.
Are there best practices for managing security responsibilities in AWS?
Document which team owns which control, automate configuration checks with AWS Config, and revisit the split whenever you adopt a new service, since it shifts depending on whether you’re using IaaS, PaaS, or SaaS.
Which security aspects are the customers responsible for in AWS?
IAM policies and access management, data encryption and classification, security group and network ACL configuration, patching on unmanaged services, and monitoring your own activity logs.
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