{"id":27832,"date":"2024-02-20T09:46:00","date_gmt":"2024-02-20T08:46:00","guid":{"rendered":"https:\/\/perseus.de\/critical-vulnerability-in-microsoft-exchange-server\/"},"modified":"2026-03-31T07:23:13","modified_gmt":"2026-03-31T05:23:13","slug":"critical-vulnerability-in-microsoft-exchange-server","status":"publish","type":"post","link":"https:\/\/perseus.de\/en\/critical-vulnerability-in-microsoft-exchange-server\/","title":{"rendered":"Critical vulnerability in Microsoft Exchange Server"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"27832\" class=\"elementor elementor-27832 elementor-2917\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-dcf4ec4 e-flex e-con-boxed e-con e-parent\" data-id=\"dcf4ec4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e1db58c elementor-widget elementor-widget-image\" data-id=\"e1db58c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"200\" src=\"https:\/\/perseus.de\/wp-content\/uploads\/2025\/04\/Gefahrenwarnung-Headerbild-Website-2025-1024x256.png\" class=\"attachment-large size-large wp-image-27799\" alt=\"\" srcset=\"https:\/\/perseus.de\/wp-content\/uploads\/2025\/04\/Gefahrenwarnung-Headerbild-Website-2025-1024x256.png 1024w, https:\/\/perseus.de\/wp-content\/uploads\/2025\/04\/Gefahrenwarnung-Headerbild-Website-2025-300x75.png 300w, https:\/\/perseus.de\/wp-content\/uploads\/2025\/04\/Gefahrenwarnung-Headerbild-Website-2025-768x192.png 768w, https:\/\/perseus.de\/wp-content\/uploads\/2025\/04\/Gefahrenwarnung-Headerbild-Website-2025.png 1200w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1258a43 e-flex e-con-boxed e-con e-parent\" data-id=\"1258a43\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-2de4e88 e-con-full e-flex e-con e-child\" data-id=\"2de4e88\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4982c80 elementor-widget elementor-widget-text-editor\" data-id=\"4982c80\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h6>20.2.2024<\/h6>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8348bc5 elementor-widget elementor-widget-heading\" data-id=\"8348bc5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Critical vulnerability in Microsoft Exchange Server<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-eb03842 e-con-full e-flex e-con e-child\" data-id=\"eb03842\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-91d0988 elementor-widget elementor-widget-text-editor\" data-id=\"91d0988\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Microsoft&#8217;s latest update shows that, by exploiting a vulnerability (CVE-2024-21410), attackers are able to carry out a so-called NTLM relay attack, also known as &#8220;Pass the Hash&#8221;. NTLM is a set of security protocols that authenticate the identity of users and the confidentiality of their activities. <\/p><p>Threat actors target programs like Outlook that have a vulnerability to spy on NTLM credentials. The program is tricked into authenticating itself to a fake server that they control. Once the credentials are exposed, they can be used for malicious purposes.  <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ceb0f40 e-flex e-con-boxed e-con e-parent\" data-id=\"ceb0f40\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ffbdc12 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"ffbdc12\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-02dd0e9 e-flex e-con-boxed e-con e-parent\" data-id=\"02dd0e9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-16d621d e-con-full e-flex e-con e-child\" data-id=\"16d621d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-89904c7 elementor-widget elementor-widget-text-editor\" data-id=\"89904c7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>What is NTLM exactly?<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-fae461d e-con-full e-flex e-con e-child\" data-id=\"fae461d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0f04793 elementor-widget elementor-widget-text-editor\" data-id=\"0f04793\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>NTLM stands for <strong>N<\/strong>ew<strong> T<\/strong>echnology <strong>L<\/strong>AN <strong>M<\/strong>anager. This is a set of security protocols that authenticate the identity of users and the confidentiality of their activities (<a href=\"https:\/\/www.crowdstrike.de\/cybersecurity-101\/ntlm-windows-new-technology-lan-manager\/\">CrowdStrike<\/a>). By using this authentication method, single sign-on on web servers or proxy servers is possible using the credentials of the Windows user login (<a href=\"https:\/\/de.wikipedia.org\/wiki\/NTLM\">Wikipedia<\/a>).  <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cdadbd8 e-flex e-con-boxed e-con e-parent\" data-id=\"cdadbd8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-104dd95 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"104dd95\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-174b215 e-flex e-con-boxed e-con e-parent\" data-id=\"174b215\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-e560a6b e-con-full e-flex e-con e-child\" data-id=\"e560a6b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-013b67e elementor-widget elementor-widget-text-editor\" data-id=\"013b67e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>What should you do?<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a72ed48 e-con-full e-flex e-con e-child\" data-id=\"a72ed48\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-db8754f elementor-widget elementor-widget-text-editor\" data-id=\"db8754f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ol><li>Patch immediately: Install the <a href=\"https:\/\/techcommunity.microsoft.com\/t5\/exchange-team-blog\/released-2024-h1-cumulative-update-for-exchange-server\/ba-p\/4047506\">2024 H1 Cumulative Update<\/a> (CU14) for Exchange Server 2019 to close CVE-2024-21410 and other vulnerabilities.<\/li><li>Enable Extended-Protection-for-Authentication: Allow CU14 setup to enable EP on your Exchange 2019 servers. Ensure readiness by reviewing the prerequisites described in the Exchange Server Health Checker script and documentation. <\/li><li>In addition, check whether all clients in your network have the latest update status of the Office products used and update them as well.<\/li><li>Stay up to date: Keep an eye out for further updates and advisories from Microsoft about this vulnerability and related threats.<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-64c1003 e-flex e-con-boxed e-con e-parent\" data-id=\"64c1003\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ec9339f elementor-widget elementor-widget-text-editor\" data-id=\"ec9339f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The security of your organization&#8217;s Exchange server environment is paramount. Act quickly to protect against potential threats and ensure uninterrupted operations. <\/p><p>We will be happy to answer any questions you may have.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>20.2.2024 Critical vulnerability in Microsoft Exchange Server Microsoft&#8217;s latest update shows that, by exploiting a vulnerability (CVE-2024-21410), attackers are able to carry out a so-called NTLM relay attack, also known as &#8220;Pass the Hash&#8221;. NTLM is a set of security protocols that authenticate the identity of users and the confidentiality of their activities. Threat actors [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[64],"tags":[],"class_list":["post-27832","post","type-post","status-publish","format-standard","hentry","category-hazard-warning"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Critical vulnerability in Microsoft Exchange Server - Perseus Technologies<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/perseus.de\/en\/critical-vulnerability-in-microsoft-exchange-server\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Critical vulnerability in Microsoft Exchange Server - Perseus Technologies\" \/>\n<meta property=\"og:description\" content=\"20.2.2024 Critical vulnerability in Microsoft Exchange Server Microsoft&#8217;s latest update shows that, by exploiting a vulnerability (CVE-2024-21410), attackers are able to carry out a so-called NTLM relay attack, also known as &#8220;Pass the Hash&#8221;. NTLM is a set of security protocols that authenticate the identity of users and the confidentiality of their activities. 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NTLM is a set of security protocols that authenticate the identity of users and the confidentiality of their activities. 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