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Get instant help if you're under attack. [Read the Unit 42 Threat Brief](https://unit42.paloaltonetworks.com/microsoft-exchange-server-vulnerabilities/)[Request help now](#microsoft_exchange_inline_form) *** ** * ** *** ![](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/solarstorm/msft-optimized.jpg) ZERO-DAY VULNERABILITIES ### Microsoft Exchange Servers Under Attack On March 2, the world learned about four critical zero-day Microsoft Exchange Server vulnerabilities. These vulnerabilities let adversaries access Microsoft Exchange Servers and potentially gain long-term access to victims' environments. Multiple threat actors are currently exploiting these zero-day vulnerabilities in the wild. *** ** * ** *** ## Steps to mitigate Exchange Server vulnerabilities For detailed instructions on each of these steps, see our Unit 42^®^ blog, ["Remediation Steps for the Microsoft Exchange Server Vulnerabilities."](https://unit42.paloaltonetworks.com/remediation-steps-for-the-Microsoft-Exchange-Server-vulnerabilities/) {#elite\_incident\_responders} *** ** * ** *** UNIT 42 ## Elite Incident Responders ![Rapid Response Security Assessment](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/solarstorm/rapid-response-security-assessment.jpg) What we do The Unit 42 team offers world-class incident response, risk management and digital forensics services. Our unparalleled experience and expertise allows you to quickly recover from attacks and permanently eliminate adversaries from your organization. From rogue insiders to nation-state threats, Unit 42 is known for being a trusted security advisor in data breach response investigations. Everything we do, from deployment to analysis and delivery of findings, is built for speed. We activate our incident response teams within minutes, integrating the specialized skill sets needed -- from forensic consultants to malware analysts and team leaders. We move quickly to contain, investigate and coordinate our response. [Start your engagement now](#microsoft_exchange_inline_form) ![Rapid Response Security Assessment-2](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/solarstorm/rapid-response-security-assessment-2.jpg) How we do it We deliver solutions on time, on budget and designed for maximum impact. Our team's experience spans security monitoring within the intelligence community and advising at the national security level to performing high-profile data breach investigations and leading remediation efforts. Unit 42 consultants can help you: * Secure unpatched Microsoft Exchange Servers * Perform a thorough investigation to identify unauthorized activity * Contain active attacks and ensure threat actors do not return * Provide ongoing monitoring and proactive cyber risk services to prevent future attacks [Get help now](#microsoft_exchange_inline_form) ![Nikesh-Arora](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/solarstorm/nikesh-headshot.png) Nikesh-AroraCEO and Chairman ![quote](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/quote-orange.svg) ## Use the lessons of these attacks to prepare your infrastructure for the next one. The tools are there now. Deploy them. [Read the blog post](https://blog.paloaltonetworks.com/2021/03/exchange-server-new-playbook/) ![](https://www.paloaltonetworks.com/content/dam/pan/en_US/images/solarstorm/nikesh-headshot.png) Nikesh-AroraCEO and Chairman [Read the blog post](https://blog.paloaltonetworks.com/2021/03/exchange-server-new-playbook/) {#solarstorm-resources} RESOURCES BLOG ### Hunting for Recent Attacks Targeting Microsoft Exchange Leveraging existing alerts in Cortex XDR, it is possible to hunt for and rapidly identify key elements of the recent Microsoft Exchange Attack currently being observed in the wild. [Read now](https://blog.paloaltonetworks.com/security-operations/attacks-targeting-microsoft-exchange) BLOG ### Threat Assessment: Microsoft Exchange Server Vulnerabilities Unit 42 researchers assess the threat of four zero-day vulnerabilities in Microsoft Exchange Server and suggest courses of action for mitigation. [Read now](https://unit42.paloaltonetworks.com/microsoft-exchange-server-vulnerabilities/) BLOG ### Analyzing Microsoft Exchange Attacks Using China Chopper Webshells Providing insight into attackers' methodology, the Unit 42 research team analyzed incidental artifacts of China Chopper webshell attacks against Microsoft Exchange Server. [Read now](https://unit42.paloaltonetworks.com/china-chopper-webshell/) PreviousNext {#solarstorm\_inline\_form} {#solarstorm\_compromise\_assessment} Microsoft Exchange Server Incident Response --- Engage with Unit 42 to determine whether you've been impacted, shut down active threats, and quickly recover from the attack. 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View our [Privacy Statement.](https://www.paloaltonetworks.com/legal-notices/privacy?ts=markdown) Start now Thank you A Palo Alto Networks specialist will reach out to you shortly. ###### If you think you may have been impacted, and need immediate assistance, \[email us\](mailto:crypsis-investigations@paloaltonetworks.com.com?subject=Immediate request for Microsoft Exchange Server vulnerabilities) or call 855.875.4631 to get in touch with the Crypsis Incident Response team. {#footer} ## Products and Services * [AI-Powered Network Security Platform](https://www.paloaltonetworks.com/network-security?ts=markdown) * [Secure AI by Design](https://www.paloaltonetworks.com/precision-ai-security/secure-ai-by-design?ts=markdown) * [Prisma AIRS](https://www.paloaltonetworks.com/prisma/prisma-ai-runtime-security?ts=markdown) * [AI Access Security](https://www.paloaltonetworks.com/sase/ai-access-security?ts=markdown) * [Cloud Delivered Security 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