Microsoft Defender External Attack Surface Management Alternatives (September 2025)

Microsoft Defender Vulnerability Management delivers asset visibility, risk-based prioritization, and remediation tools to help your teams address critical vulnerabilities.

Microsoft Defender for Cloud is a cloud security posture management (CSPM), cloud workload protection (CWP) and DevOps security solution for multicloud and hybrid environments

Get full visibility of your SaaS app landscape and take control of your apps with Microsoft Defender for Cloud Apps, a comprehensive SaaS security solution.

Microsoft Defender for IoT is an IoT security solution that offers asset discovery, vulnerability management, and threat protection for IoT and ICS/OT devices.

Explore how Microsoft Defender XDR helps identify and stop cyberattacks across endpoints, identities, email, collaborations tools, SaaS apps, cloud workloads, data loss insights, and more.

Attack Surface Management solutions from Censys. Attack Surface Management is the monitoring of sensitive external assets.

Gain full attack surface visibility, assess and prioritize exposures, and automate responses to outpace adversaries with CrowdStrike Falcon® Exposure Management.

Use Detectify to get complete coverage of your growing attack surface with Surface Monitoring and Application Scanning.

Protect your data, apps, and infrastructure against rapidly evolving cyberthreats with cloud security services from Microsoft Security.

Discover the risks across your attack surface with Halo Security's complete attack surface management platform.

Microsoft Defender Threat Intelligence is a dynamic threat intelligence solution that helps protect your organization from modern cyberthreats and exposure.

Discover Qualys VMDR, the powerful, cloud-based, vulnerability management software redefining cyber risk management. Try it today!

Illuminate and disrupt the attack paths leading to your critical assets, in the cloud or on-premises.

Optimize business performance by gaining visibility and preventing likely attacks with Tenable One. Click here to protect your attack surface with Tenable One.

Learn about Azure Web Application Firewall, a firewall service that helps improve web app security.

The unified ZeroFox External Cybersecurity Platform exposes, disrupts, and responds to threats outside the perimeter.

Armis, the asset intelligence and cybersecurity company.

Discover how the Qualys Cloud Security Posture Management (CSPM) tool enables you to continuously discover, monitor, and analyze your cloud assets.

Explore uninterrupted Attack Surface Discovery and Penetration Testing services for robust security measures. Identify vulnerabilities and fortify your defenses with our comprehensive solutions.

Understand your risk and know which vulnerabilities and assets to prioritize first with Tenable Security Center. Prioritize and investigate vulnerabilities with Tenable Security Center.

Microsoft Defender for Identity helps protect your organization’s on-premises identities from advanced threats and manage identity risk.

Third-party risk and attack surface management software. UpGuard is the best platform for securing your organization’s sensitive data. Our security ratings engine monitors millions of companies and billions of data points every day.

Continuously expose and mitigate your most relevant known and unknown risks with threat intelligence, tailored to your attack surface.

Our penetration testing simulates a real-world attack on your digital assets to determine the strength of your security & defenses.

Microsoft Defender for Endpoint helps stop attacks, scales endpoint security resources, and evolves defenses. Learn more about cloud-powered endpoint protection.

Cavelo helps businesses proactively reduce cybersecurity data risk and stay compliant with automated data discovery, classification and reporting.

Learn about Microsoft Defender for Business, an endpoint security solution built to help protect small businesses against cybersecurity threats.

Take control of your online attack surface; quickly identify the scale and severity of your issues with FractalScan Surface attack surface management.

Microsoft Sentinel is a cloud-native SIEM that provides intelligent security analytics for your entire enterprise, powered by AI.

2024 Gartner Peer Insights "Customers’ Choice" for CAASM. Complete visibility. Uncover exposures in minutes - no agents, credentials, or hardware required!

Get advanced threat protection with Microsoft Defender for Office 365 and protect against cyber threats like business email compromise and phishing.

Secure your attack surface with automated vulnerability scanning, continuous network monitoring, and proactive threat response in one platform. Try for free.

Attack Surface Management & Dark Web Monitoring made simple. Enter your company name to see what attackers know about you.

Microsoft Purview Data Loss Prevention provides unified data loss prevention capabilities across endpoints, apps, and services.

Put preventive security into practice with Tenable Cloud Security

Akamai API Security enables organizations to gain full visibility into their entire API estate with continuous detection and real-time analysis.

Protect data and personal information across on-premises, SharePoint, OneDrive, Exchange, Microsoft Teams, endpoints, and non-Microsoft clouds with Microsoft Purview Information Protection.

Defend against Distributed Denial of Service (DDoS) attacks on your applications and network with integrated DDoS protection and mitigation services from Azure.

Upgrade your VM strategy with Tenable Vulnerability Management. Try it for free here to find out why Tenable is different from other tools in the market!

Find out more about Nessus - the trusted gold standard for vulnerability assessment, designed for modern attack surfaces - used by thousands of organizations.

Learn how our experts can make your security program relevant, actionable, and sustainable with a combination of cybersecurity services.

Confidently and quickly identify threats and maintain cloud security for hybrid environments by using Trend Vision One.

Discover Qualys Web Application Firewall, our web app firewall cloud service for scalable, simple, and powerful protection of web applications. Try it today!

Augmentt's multi-tenant platform gives MSPs visibility into SaaS apps and M365 environments so you can easily audit, protect and detect security threats for all end users.

Protect, monitor, and report on your Azure Virtual Network resources using Azure Firewall, a cloud-native network security and analytics solution.

Unified Platform for managing your Third-Party Risk, Attack Surface Management, and Automated Vendor Questionnaire Assessments

WithSecure™ (formerly F-Secure) Elements Collaboration Protection adds comprehensive protection beyond your Microsoft 365 security features. Learn more here.

Protect your data with Azure Sphere, a turnkey IoT device security and IoT platform solution for intelligent edge devices and microcontrollers.

Prioritize critical issues across siloed data sources, validate exposures in real-time, and deploy one-click mitigations to close gaps fast.

Learn why IT and security teams trust Axonius to manage and secure their cybersecurity assets and SaaS apps with SSPM and CAASM solutions in one platform.

Gain end-to-end observability into your applications, infrastructure, and network both on cloud and hybrid environments with Azure Monitor.

Challenge, assess, and optimize your enterprise's cybersecurity posture with the number one Exposure Management & Security Validation platform.

Cequence API security and bot management solutions unify API discovery, compliance, and protection capabilities to defend against attacks, abuse, and fraud.

Engage with your customers across multiple platforms and simplify the sign-in experience with Azure Active Directory B2C.

Easily manage assets and their vulnerabilities across your security tools, programs and attack surface with the Brinqa platform.

Discover superior security solutions with Edgescan. From PTaaS to continuous security testing, we have your back. Learn more about our services.

Directory Services Protector (DSP) provides continuous Active Directory threat detection and response, including automated remediation.

With Rapid7's vulnerability management tool you will be able to understand and prioritize risk with clarity. Learn more about InsightVM and start a free trial today.

Stay vigilant with LevelBlue's Network Security Monitoring. Real-time insights and proactive defense against threats targeting your network.

Invent with purpose, realize cost savings, and make your organization more efficient with Microsoft Azure’s open and flexible cloud computing platform.

Wallarm automates real-time application protection and security testing for APIs, apps, and microservices and APIs across multi-cloud and K8s environments.

Azure Policy is a service in Azure, that you use to create, assign and, manage policy definitions in your Azure environment.

Take a risk-based approach to application vulnerability management with Ivanti Neurons for Application Security Orchestration and Correlation (ASOC).

Bitsight is a global cyber risk management leader transforming how companies manage exposure, performance, and risk for themselves and their third parties.

Reduce third-party incidents by 75% and transform how your team identifies, monitors, mitigates, and reports on risk.

Powered by technology from Threat Stack, F5 Distributed Cloud AIP delivers comprehensive telemetry and high-efficacy intrusion detection for cloud-native workloads. Customers can now better address a larger threat surface with increased visibility and support in securing both modern applications and the infrastructure they run on.

Fortra Vulnerabilty Management (formerly Frontline VM™) lets companies leverage a full suite of vulnerability assessment applications with our SaaS platform. ✔Get a quote today!

Imperva's Web Application Firewall is the industry-leading solution to help defend your web application from external and internal threats.

The growing attack surface is challenging - get a comprehensive single and unified cybersecurity platform for your environments.

Identify insider risks and take action with Microsoft Purview Insider Risk Management. Evaluate potential risks using machine learning for end-to-end investigations.

Learn how F5 Distributed Cloud WAF combines F5’s industry leading web application firewall in an easy-to-use SaaS format.

Using the right application security solution helps protect your apps and websites. Learn more about application security and performance solutions.

Microsoft Purview Compliance Manager helps organizations automatically assess and manage compliance across their multicloud environment.

Scale your AppSec practices by continuously scanning and analyzing each risk's internal context— all enabled by Active ASPM.

Automation to detect, remediate, investigate, and analyze risk data with Microsoft Entra ID Protection

Introducing Microsoft Purview Data Governance, a comprehensive tool leveraging AI and machine learning for more effective data visibility, data management, and data governance.

Discover Qualys Web Application Scanning, our cloud solution for continuous web app discovery and detection of vulnerabilities. Try it today!

Cyberheals - NextGen Cybersecurity Company Protect your assets with CyberHeals cutting-edge cybersecurity products and services. Safeguard your business today!

Discover Indusface WAS, our AI-powered DAST scanner ensuring ZERO false positives, scans OWASP top 10 & zero-day threats and integrates with DevSecOps CI/CD.

This article provides an overview of Azure Front Door.

Explains what Microsoft Advanced Threat Analytics (ATA) is and what kinds of suspicious activities it can detect

Continuously minimize cloud attack surface based on runtime insights, while actively adapting runtime security with real risk context.

Force-multiply your AppSec program with Apiiro’s diamond-grade application security posture management (ASPM) platform.

Use Azure Arc solutions for hybrid and multi-cloud management to run Azure services anywhere. Accelerate innovation with Azure Arc–enabled data services.

Catch hidden threats on your networks before it's too late with network visibility and advanced analytics from IBM QRadar NDR

Cisco Defense Orchestrator is a cloud-based security policy manager that simplifies and unifies policy across your Cisco firewalls and IOS devices.

Transform your approach to API and AppSec with a single platform approach to detect and remediate vulnerabilities, while protecting vulnerable APIs and web apps.

Get the Qualys EDR tool - our dynamic endpoint detection and response software powered by the Enterprise TruRisk Platform. Try it today!

Secure your network and devices, manage device and application updates, and receive long-term OS support with Windows 10 IoT Core Services.

Reduce costs using cost optimization and analysis through Microsoft Cost Management. Increase transparency, accuracy, and efficiency in cost management.

Protect your clients' critical data in the Microsoft Cloud and provide 24/7 security monitoring for Microsoft SaaS apps. Fortify, a cybersecurity SaaS solution.

Buster.Ai is your digital shield against misleading and deepfake contents that threaten your company's security and finances. Thanks to our SaaS platform with Generative AI and award-winning Large Language Models, we protect companies and governments against informational threats in two steps: preemptively alerting on risks before damage occurs and automatically taking counter-actions to contain and prevent new attacks. Thanks to Buster.Ai's B2B SaaS platform, CISOs and CMOs can take a preventive approach to crisis management before financial or reputational damage occurs.

Explore NetSPI's Penetration Testing as a Service (PTaaS) offering. Enhance your organization's security with expert assessments and actionable insights.

Salt Security's API Security Platform discovers all APIs and their exposed data, stops attackers in their tracks, and provides remediation insights.

Discover our complete, efficient, integrated PCI compliance solution that delivers one holistic view of your IT assets and PCI compliance posture.

RedShield Web Application & API Vulnerability Shielding | RedShield Detects, Prevents, and Mitigates Your Web App Vulnerabilities At Speed And Scale | Learn More

Experience unparalleled penetration testing with our elite team, dedicated to uncovering vulnerabilities and safeguarding your business assets.

Azure Advisor is a recommendation service that analyzes your configurations and usage, then helps you follow Azure best practices to optimize your deployments.

Automatically discover and whitelist API connections across distributed cloud applications with active monitoring for anomalous behavior, using F5 API Security.