{"id":64111,"date":"2026-06-03T22:19:05","date_gmt":"2026-06-03T15:19:05","guid":{"rendered":"https:\/\/vhost.vn\/infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026\/"},"modified":"2026-06-04T18:28:51","modified_gmt":"2026-06-04T11:28:51","slug":"infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026","status":"publish","type":"post","link":"https:\/\/vhost.vn\/en\/infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026\/","title":{"rendered":"Infrastructure Incident Notice: Large-Scale DDoS Attack Since May 23th, 2026"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"64111\" class=\"elementor elementor-64111 elementor-64094\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4e090b5 e-flex e-con-boxed e-con e-parent\" data-id=\"4e090b5\" 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-655c9cb3 elementor-widget elementor-widget-text-editor\" data-id=\"655c9cb3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Dear Valued Customers,<\/p><p>vHost would like to provide details regarding the large-scale DDoS attack affecting our systems from <strong>May 23th to May 27th, 2026<\/strong>.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/vhost.vn\/en\/infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026\/#1_Incident_timeline\" >1. Incident timeline<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/vhost.vn\/en\/infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026\/#May_23_%E2%80%93_Attack_Outbreak\" >May 23 \u2013 Attack Outbreak<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/vhost.vn\/en\/infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026\/#May_24th_%E2%80%93_Urgent_Coordination_with_Partners\" >May 24th \u2013 Urgent Coordination with Partners<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/vhost.vn\/en\/infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026\/#May_27th_%E2%80%93_40_Gbps_Upgrade_Completed\" >May 27th \u2013 40 Gbps Upgrade Completed<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/vhost.vn\/en\/infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026\/#Current_Status_As_of_June_3_2026\" >Current Status (As of June 3, 2026)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/vhost.vn\/en\/infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026\/#2_Recorded_Attack_Types\" >2. Recorded Attack Types<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/vhost.vn\/en\/infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026\/#3_Temporary_Solutions_to_Ensure_Service_Security\" >3. Temporary Solutions to Ensure Service Security<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/vhost.vn\/en\/infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026\/#a_Block_all_ICMP_ping_across_vHost_IP_ranges\" >a. Block all ICMP (ping) across vHost IP ranges<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/vhost.vn\/en\/infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026\/#b_Change_DNS_Resolver_Action_required_before_June_5th_2026\" >b. Change DNS Resolver (Action required before June 5th, 2026)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/vhost.vn\/en\/infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026\/#c_Update_Time_Server\" >c. Update Time Server<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/vhost.vn\/en\/infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026\/#4_Commitments_from_vHost\" >4. Commitments from vHost<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Incident_timeline\"><\/span><strong>1. Incident timeline<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"May_23_%E2%80%93_Attack_Outbreak\"><\/span><strong>May 23 \u2013 Attack Outbreak<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>From May 23th, the system recorded a massive spike in DDoS attack traffic, exceeding <strong>10 Gbps.<\/strong> This caused <strong>uplink congestion<\/strong> and severely impacted BGP peering operations.<\/p><figure class=\"wp-block-image aligncenter size-full\"><a href=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image.png\" data-rel=\"lightbox-gallery-mnLFQQE7\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img fetchpriority=\"high\" decoding=\"async\" width=\"816\" height=\"349\" class=\"wp-image-64095\" src=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image.png\" alt=\"\" srcset=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image.png 816w, https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-300x128.png 300w, https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-768x328.png 768w\" sizes=\"(max-width: 816px) 100vw, 816px\" \/><\/a><\/figure><p>To ensure stability for other users, vHost <strong>rerouted traffic to redundant routers<\/strong>, mitigating the load and maintaining operations for most services.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"May_24th_%E2%80%93_Urgent_Coordination_with_Partners\"><\/span><strong>May 24th \u2013 Urgent Coordination with Partners<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>On Sunday morning, May 24th, vHost worked urgently with our infrastructure partners to deploy an uplink upgrade to <strong>40 Gbps<\/strong> to handle the escalating attack volume.<\/p><p>However, due to administrative procedures on the partner&#8217;s side, the deployment took longer than anticipated.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"May_27th_%E2%80%93_40_Gbps_Upgrade_Completed\"><\/span><strong>May 27th \u2013 40 Gbps Upgrade Completed<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>By Wednesday evening, May 27th, 2026, the upgrade was successfully completed, raising the total uplink bandwidth to <strong>40 Gbps<\/strong>. This enhanced the system&#8217;s capacity to absorb and mitigate larger attack volumes.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Current_Status_As_of_June_3_2026\"><\/span><strong>Current Status (As of June 3, 2026)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>vHost continues to record daily attacks on the system. The peak occurred on June 2, with 3 separate attack waves reaching over 22 Gbps per incident.<\/p><figure class=\"wp-block-image aligncenter size-full\"><a href=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-2.png\" data-rel=\"lightbox-gallery-mnLFQQE7\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img decoding=\"async\" width=\"818\" height=\"348\" class=\"wp-image-64097\" src=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-2.png\" alt=\"\" srcset=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-2.png 818w, https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-2-300x128.png 300w, https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-2-768x327.png 768w\" sizes=\"(max-width: 818px) 100vw, 818px\" \/><\/a><\/figure><figure class=\"wp-block-image aligncenter size-full\"><a href=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-1.png\" data-rel=\"lightbox-gallery-mnLFQQE7\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img decoding=\"async\" width=\"816\" height=\"345\" class=\"wp-image-64096\" src=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-1.png\" alt=\"\" srcset=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-1.png 816w, https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-1-300x127.png 300w, https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-1-768x325.png 768w\" sizes=\"(max-width: 816px) 100vw, 816px\" \/><\/a><\/figure><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Recorded_Attack_Types\"><\/span><strong>2. Recorded Attack Types<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2><p>Recent attacks have primarily focused on two vectors:<\/p><ul class=\"wp-block-list\"><li><strong>ICMP Flood Attack<\/strong><\/li><li><strong>UDP Flood Attack<\/strong>, including:<br><ul class=\"wp-block-list\"><li><strong>DNS Amplification Attack<\/strong><\/li><li><strong>DNS Amplification Attack<\/strong><\/li><\/ul><\/li><\/ul><figure class=\"wp-block-image aligncenter size-full\"><a href=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-3.png\" data-rel=\"lightbox-gallery-mnLFQQE7\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" width=\"342\" height=\"198\" class=\"wp-image-64113\" src=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-3.png\" alt=\"\" srcset=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-3.png 342w, https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-3-300x174.png 300w\" sizes=\"(max-width: 342px) 100vw, 342px\" \/><\/a><\/figure><p>When traffic exceeded 22\u201325 Gbps, the system had to process a massive volume of malicious traffic, leading to overloads. vHost utilized <strong>hardware offload on dedicated firewall appliances<\/strong> to scrub malicious traffic, successfully reducing the load on the OS level and maintaining the most stable operations possible. <\/p><p>Statistics show that the majority of the attack traffic over the past month originated primarily from two countries:<\/p><ul class=\"wp-block-list\"><li>United States: 38.16%<\/li><li>Vietnam: 29.76%<\/li><\/ul><figure class=\"wp-block-image aligncenter size-large\"><a href=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-4.png\" data-rel=\"lightbox-gallery-mnLFQQE7\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"443\" class=\"wp-image-64115\" src=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-4-1024x443.png\" alt=\"\" srcset=\"https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-4-1024x443.png 1024w, https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-4-300x130.png 300w, https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-4-768x332.png 768w, https:\/\/vhost.vn\/wp-content\/uploads\/2026\/06\/image-4.png 1469w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Temporary_Solutions_to_Ensure_Service_Security\"><\/span><strong>3. Temporary Solutions to Ensure Service Security<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"a_Block_all_ICMP_ping_across_vHost_IP_ranges\"><\/span><strong>a. Block all ICMP (ping) across vHost IP ranges<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>To minimize the impact of ICMP Floods, vHost has temporarily <strong>blocked all ping requests across our entire IP range<\/strong>. If you are monitoring your services via ping, please switch to alternative protocols: <\/p><ul class=\"wp-block-list\"><li>HTTP \/ HTTPS<\/li><li>TCP Port<\/li><li>DNS<\/li><li>Other end-services<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"b_Change_DNS_Resolver_Action_required_before_June_5th_2026\"><\/span><strong>b. Change DNS Resolver (Action required before June 5th, 2026)<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>To avoid DNS resolution disruptions while the system mitigates Amplification attacks by blocking UDP traffic, please switch the DNS Resolvers for your Servers\/VPS hosted at vHost to:<\/p><p><strong>\u27a1\ufe0f 103.143.145.6<\/strong><\/p><p><strong><em>Note: <\/em><\/strong><em>This DNS Resolver update only applies to Dedicated Servers and Cloud VPS services that you operate at vHost. For Email, Hosting, and other Managed Services, vHost will proactively update this for you. <\/em><\/p><p>DNS Resolver configuration guide: <a href=\"https:\/\/vhost.vn\/huong-dan-cau-hinh-dns-resolver\/\">https:\/\/vhost.vn\/huong-dan-cau-hinh-dns-resolver\/<\/a><\/p><p>To ensure your configuration is correct, you can contact us at support@vhost.vn for verification and support.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"c_Update_Time_Server\"><\/span><strong>c. Update Time Server<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>For services requiring time synchronization, please use:<\/p><p><strong>\u27a1\ufe0f time.vhost.vn<\/strong><\/p><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Commitments_from_vHost\"><\/span><strong>4. Commitments from vHost<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2><p>vHost will continuously:<\/p><ul class=\"wp-block-list\"><li>Closely monitor attack traffic volume.<\/li><li>Optimize filtering and traffic scrubbing systems, as well as routing management when necessary.<\/li><li>Coordinate with upstream providers to enhance resilience.<\/li><li>Ensure your services operate stably.<\/li><\/ul><p>We sincerely apologize for the inconvenience caused during this period and highly appreciate your understanding and cooperation.<\/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>Dear Valued Customers, vHost would like to provide details regarding the large-scale DDoS attack affecting our systems from May 23th to May 27th, 2026. 1. Incident timeline May 23 \u2013 Attack Outbreak From May 23th, the system recorded a massive spike in DDoS attack traffic, exceeding 10 Gbps. This caused uplink congestion and severely impacted [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":64110,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[479,118],"tags":[],"class_list":["post-64111","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bao-mat","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Infrastructure Incident Notice: Large-Scale DDoS Attack Since May 23th, 2026 - vHost<\/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:\/\/vhost.vn\/en\/infrastructure-incident-notice-large-scale-ddos-attack-since-may-23th-2026\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Infrastructure Incident Notice: Large-Scale DDoS Attack Since May 23th, 2026 - vHost\" \/>\n<meta property=\"og:description\" content=\"Dear Valued Customers, vHost would like to provide details regarding the large-scale DDoS attack affecting our systems from May 23th to May 27th, 2026. 1. 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