Cloud Security in 2025: Threats, Technologies & Best Practices

What Is Cloud Security?

Cloud security refers to the discipline of protecting cloud-based infrastructure, applications, and data from internal and external threats. It includes a set of technologies, controls, processes, and best practices that work together to ensure the confidentiality, integrity, and availability of cloud resources.

Unlike traditional IT environments, cloud security operates under a shared responsibility model. The cloud provider is responsible for securing the infrastructure, while customers must secure what they deploy in the cloud—such as applications, data, and access policies. The division of responsibilities varies depending on the cloud service model (IaaS, PaaS, or SaaS).

Cloud security strategies often incorporate identity and access management (IAM), data encryption, workload protection, and continuous monitoring. These are supported by tools such as security information and event management (SIEM), cloud-native firewalls, and endpoint protection. Security should also be automated and integrated with CI/CD pipelines.

This is part of a series of articles about information security.

Common Security Threats in Cloud Computing

There are several factors that often contribute to security threats in cloud environments.

Cloud Misconfigurations

Cloud misconfigurations occur when cloud settings are incorrectly set by users, leading to vulnerabilities. Common misconfigurations include improperly set permissions and exposed data storage buckets. Such errors can expose sensitive data to unauthorized access and compromise system integrity. The dynamic nature of cloud environments often complicates security management, increasing the likelihood of these mistakes.

To address this, automated tools can scan configurations and alert administrators to discrepancies. Regular audits are crucial to rectify misconfigurations promptly. Many cases of data exposure in the cloud can be traced back to oversight or lack of compliance with best practices.

Data Breaches

Data breaches in the cloud often stem from weak access controls, vulnerabilities in software, and inadequate monitoring. Such breaches can lead to the exposure of personal and sensitive information, causing damage to organizations and their customers. In cloud environments, the interconnectedness and shared resources increase the impact of any single intrusion.

Preventing data breaches requires implementing access management, encryption, and continuous monitoring. Since cloud environments are constantly evolving, these measures need updating to address new and emerging threats. Additionally, educating employees about phishing and social engineering can prevent credential-based breaches.

Data Loss

Data loss in cloud environments occurs due to accidental deletion, ransomware attacks, or natural disasters. Unlike on-premises solutions, cloud data might not be directly retrievable without backups. Cloud providers typically offer redundancy and failover mechanisms, but sole reliance on them can be risky. Organizations must have robust data backup strategies to ensure continuity and availability.

Implementing a data backup and recovery plan can mitigate data loss risks. Regular testing of backup processes ensures that data can be recovered during incidents. Deploying version control and maintaining copies of critical data in different geographic locations improves recovery resilience.

Account Hijacking

Account hijacking involves gaining unauthorized access to user accounts in the cloud, often through phishing or credential theft. Once the attacker gains control, sensitive data can be accessed, and malicious activities can be carried out. Methods like multifactor authentication (MFA) reduce the risk of account hijacking but require proper implementation and user compliance.

To combat account hijacking, organizations must go beyond basic password security. Incorporating MFA provides an additional layer beyond passwords, improving protection. Monitoring account activities and unusual access patterns can help identify potential compromises early.

Insecure Interfaces and APIs

APIs are essential for cloud services, allowing interaction between applications. However, insecure APIs can be entry points for attackers. Poorly designed APIs can expose data or enable unauthorized access to cloud resources. The complexity of APIs, if not managed properly, can lead to vulnerabilities that are difficult to detect and exploit. Securing APIs involves adopting strong authentication and authorization mechanisms.

Implementing rate limiting, encryption, and regular security testing further improves their security. Developers must adhere to secure coding practices. API gateways can provide central control and monitoring, ensuring consistent security policies are applied across all interfaces.

Denial of Service (DoS) Attacks

Denial of Service (DoS) attacks involve overwhelming a service to render it unavailable to legitimate users. In cloud environments, these attacks can become amplified due to the scalability nature of cloud resources, making it easier to exhaust resources. Cloud providers may mitigate these attacks by offering distributed denial of service (DDoS) protection services, helping to absorb and manage traffic flow.

To counter DoS attacks, organizations should implement rate limiting and traffic filtering to block malicious requests. Utilizing cloud-native security tools can prevent and respond to such attacks efficiently. Contractual security provisions from cloud providers must include DDoS mitigation capabilities.

Malicious Insiders

Malicious insiders pose a threat from within the organization, leveraging authorized access to cause harm or steal data. Cloud environments can exacerbate this risk due to extensive data access across services and locations. Without proper monitoring, identifying malicious activity can be challenging until damage is done.

Implementing stringent access controls and regular activity audits help detect abnormal actions indicative of insider threats. Companies should apply the principle of least privilege, giving users only necessary permissions. Logging and monitoring can alert administrators to suspicious behaviors, allowing timely intervention.

Cloud Security Across Different Providers

Cloud Security on AWS

Amazon Web Services (AWS) is one of the largest and most widely adopted cloud platforms, offering a set of global services including compute, storage, networking, and databases. AWS's approach to security is built on a shared responsibility model, where AWS manages the security of the cloud infrastructure, and customers manage security in the cloud.

AWS provides the following security tools and services:

• Identity and Access Management (IAM) for granular permission control
• AWS Shield for DDoS protection
• Amazon GuardDuty for threat detection and continuous monitoring
• Encryption at rest and in transit using AWS Key Management Service (KMS)
• Virtual Private Cloud (VPC) for network isolation
• Security groups and network ACLs for traffic filtering

Cloud Security on Azure

Microsoft Azure is a cloud computing platform offering services for analytics, virtual computing, storage, and networking. Known for its integration with Microsoft’s enterprise ecosystem, Azure emphasizes security through a layered approach and provides tools to protect identities, data, and workloads.

Azure provides the following security tools and services:

• Azure Active Directory (AD) for identity and access management
• Azure Security Center for unified threat protection and compliance
• Azure Key Vault for secure key and secret management
• Network Security Groups (NSGs) for traffic control
• Azure Firewall for centralized traffic inspection and filtering
• Encryption for data at rest and in transit

Cloud Security on Google Cloud

Google Cloud delivers a suite of cloud services backed by Google’s global infrastructure. It focuses on delivering security through custom-built infrastructure, secure-by-default services, and advanced threat intelligence.

Google Cloud provides the following security tools and services:

• Identity and Access Management (IAM) with fine-grained role controls
• Encryption by default with support for customer-managed and supplied keys
• Security Command Center for visibility into risks and threats
• Google Cloud Armor for DDoS defense and web application protection
• VPC Service Controls to prevent data exfiltration
• Custom hardware security using Google’s Titan chips

Cloud Security on Other Cloud Providers

Beyond the major players, most other cloud providers offer specialized cloud security features tailored to use cases or industries:

• IBM Cloud integrates security across its hybrid and multicloud environments, leveraging its heritage in enterprise IT. Key features include IBM Cloud Security Advisor for risk identification, data encryption with IBM Key Protect, and support for confidential computing using secure enclaves. IBM emphasizes regulatory compliance, supporting standards like FIPS 140-2 and HIPAA.
• Oracle Cloud Infrastructure (OCI) emphasizes built-in security and database protection. OCI offers services such as Oracle Identity Cloud Service for identity management, Data Safe for database security assessment, and Vault for encryption key management. Its architecture separates network and compute resources for improved isolation.
• Alibaba Cloud, dominant in the Asia-Pacific region, provides services like Anti-DDoS Pro, Web Application Firewall (WAF), and ActionTrail for activity auditing. It offers encryption tools and adheres to compliance standards such as ISO 27001 and China’s Cybersecurity Law, making it a strong choice for organizations operating in China.

Key Technologies Supporting Cloud Security

Multi-Factor Authentication

Multi-Factor Authentication (MFA) improves security by requiring multiple verification methods before granting access. Typically involving something you know (password) and something you have (a code sent to a device), MFA protects against unauthorized access.

MFA’s adoption can be simplified with tools that simplify user experience without compromising security. Organizations should ensure systems support MFA and educate users about its use and purpose. Effective implementation involves selecting the right MFA option that balances security needs with usability.

Identity and Access Management

Identity and Access Management (IAM) involves processes and tools to manage digital identities and control access to resources. It is fundamental in cloud environments, ensuring that only authorized users can access data and applications. By implementing IAM, organizations can reduce insider threats and improve compliance.

IAM systems automate the onboarding and offboarding of users, granting and revoking access as roles change. This automation ensures a swift response to security needs, maintaining a secure access protocol. Combining IAM with policies like least privilege helps prevent unauthorized access.

Cloud Firewalls

Firewalls are crucial in monitoring and controlling incoming and outgoing network traffic based on security rules. They form a foundational element in cloud security architectures, preventing unauthorized access while allowing legitimate communication. In the cloud, deploying cloud-native firewalls effectively guards workloads and applications from various threats.

Cloud firewalls allow dynamic adaptation to network changes, scaling automatically with cloud infrastructure. Their integration into cloud environments enables centralized management of security policies, improving network defense measures. Implementing effective firewall rules requires understanding application communication needs, ensuring they enforce security without hindering legitimate traffic.

Intrusion Detection and Prevention Systems

Intrusion Detection and Prevention Systems (IDPS) monitor cloud environments for suspicious activities, identifying and responding to threats. These systems deploy rule-based and anomaly-based detection techniques to identify potential security breaches. The real-time nature of IDPS ensures swift actions against detected threats, minimizing potential damage.

In the cloud, IDPS solutions often integrate seamlessly with other security measures, improving overall security posture. Configuring IDPS appropriately to balance sensitivity and noise is crucial, avoiding alarm fatigue while staying vigilant against legitimate threats. Regular review and refinement of detection strategies ensure IDPS remains effective against evolving attack vectors.

Exposure Management

Exposure management refers to the continuous process of identifying, evaluating, and reducing an organization’s attack surface across its cloud environments. Unlike traditional vulnerability management, which focuses on known software flaws, exposure management looks at how assets—such as misconfigured services, public-facing endpoints, and unused identities—can be exploited in real-world attack scenarios.

Effective exposure management combines asset discovery, contextual risk assessment, and attack path analysis. Tools should automatically inventory cloud resources, classify them by sensitivity, and detect changes such as new internet-exposed services or privilege escalations.

Security Information and Event Management

Security Information and Event Management (SIEM) systems provide security visibility by aggregating and analyzing security data from across the cloud infrastructure. SIEM is integral for detecting, responding, and investigating incidents, offering insight into cloud security. Advanced analytics and machine learning improve SIEM's capacity to identify emerging threats.

Deploying SIEM requires integration with existing security tools, enabling consolidated monitoring and alerting. The automation of threat detection and incident response simplifies operations, reducing response time to potential threats. SIEM's centralized approach aids compliance efforts, maintaining detailed logs essential for audits and investigations.

Endpoint Protection

Endpoint protection secures devices connected to the cloud, covering laptops, smartphones, and tablets. By protecting endpoints, organizations reduce the risk of data breaches stemming from device-based attacks. Endpoint protection integrates antivirus, anti-malware, and other security measures to ensure device security.

Incorporating endpoint protection involves consistent software updates and patches to guard against vulnerabilities. Organizations should deploy solutions that offer real-time threat detection and endpoint visibility, ensuring defense coverage. Training users on secure practices and recognizing suspicious activities further bolster endpoint security.