{"id":54054,"date":"2023-10-10T13:49:01","date_gmt":"2023-10-10T13:49:01","guid":{"rendered":"https:\/\/packetstormsecurity.com\/news\/view\/35108\/Rapid-Reset-Zero-Day-Exploited-To-Launch-Largest-DDoS-Attacks-In-History.html"},"modified":"2023-10-10T13:49:01","modified_gmt":"2023-10-10T13:49:01","slug":"rapid-reset-zero-day-exploited-to-launch-largest-ddos-attacks-in-history","status":"publish","type":"post","link":"https:\/\/www.threatshub.org\/blog\/rapid-reset-zero-day-exploited-to-launch-largest-ddos-attacks-in-history\/","title":{"rendered":"Rapid Reset Zero Day Exploited To Launch Largest DDoS Attacks In History"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/www.securityweek.com\/wp-content\/uploads\/2023\/10\/HTTP2-Rapid-Reset.png\" class=\"ff-og-image-inserted\"><\/div>\n<p><strong>Cloudflare, Google and AWS revealed on Tuesday that a new zero-day vulnerability named \u2018HTTP\/2 Rapid Reset\u2019 has been exploited by malicious actors to launch the largest distributed denial-of-service (DDoS) attacks in internet history.<\/strong>\n<\/p>\n<p>Cloudflare started analyzing the attack method and the underlying vulnerability in late August. The company says an unknown threat actor has exploited a weakness in the widely used HTTP\/2 protocol to launch \u201cenormous, hyper-volumetric\u201d DDoS attacks.&nbsp;\n<\/p>\n<p>One of the attacks seen by Cloudflare was three times larger than the record-breaking <a href=\"https:\/\/www.securityweek.com\/record-breaking-71-million-rps-ddos-attack-seen-by-cloudflare\/\">71 million requests per second (RPS) attack<\/a> reported by company in February. Specifically, the HTTP\/2 Rapid Reset DDoS campaign peaked at 201 million RPS.&nbsp;\n<\/p>\n<p>In Google\u2019s case, the company observed a DDoS attack that peaked at 398 million RPS, more than seven times the largest attack the internet giant had <a href=\"https:\/\/www.securityweek.com\/google-blocks-record-setting-ddos-attack-peaked-46-million-rps\/\">previously seen<\/a>.&nbsp;\n<\/p>\n<p>Amazon saw over a dozen HTTP\/2 Rapid Reset attacks over the course of two days in late August, with the largest peaking at 155 million RPS.&nbsp;\n<\/p>\n<p>The new attack method abuses an HTTP\/2 feature called \u2018stream cancellation\u2019, by repeatedly sending a request and immediately canceling it.&nbsp;\n<\/p>\n<p>\u201cBy automating this trivial \u2018request, cancel, request, cancel\u2019 pattern at scale, threat actors are able to create a denial of service and take down any server or application running the standard implementation of HTTP\/2,\u201d Cloudflare explained.&nbsp;<\/p>\n<div class=\"zox-post-ad-wrap\"><span class=\"zox-ad-label\">Advertisement. Scroll to continue reading.<\/span><\/div>\n<p>The company noted that the record-breaking attack aimed at its customers leveraged a botnet of only 20,000 compromised devices.&nbsp;The web security firm regularly sees attacks launched by botnets powered by hundreds of thousands and even millions of machines.\n<\/p>\n<p>The underlying vulnerability, which is believed to impact every web server implementing HTTP\/2, is tracked as CVE-2023-44487 and it has been assigned a \u2018high severity\u2019 rating with a CVSS score of 7.5.\n<\/p>\n<p><a href=\"https:\/\/blog.cloudflare.com\/technical-breakdown-http2-rapid-reset-ddos-attack\/\">Cloudflare<\/a> and <a href=\"https:\/\/cloud.google.com\/blog\/products\/identity-security\/how-it-works-the-novel-http2-rapid-reset-ddos-attack\">Google<\/a> have published blog posts providing technical details on the HTTP\/2 Rapid Reset attack. <a href=\"https:\/\/aws.amazon.com\/blogs\/security\/how-aws-protects-customers-from-ddos-events\/\">AWS<\/a> has also published a blog post describing the HTTP\/2 Rapid Reset attacks it has observed.&nbsp;\n<\/p>\n<p>The companies said their existing DDoS protections were largely able to handle HTTP\/2 Rapid Reset, but they have implemented additional mitigations for this attack method. Web server software companies have been warned and they have started developing patches that should prevent exploitation of the vulnerability.&nbsp;\n<\/p>\n<p>\u201cAny enterprise or individual that is serving an HTTP-based workload to the Internet may be at risk from this attack,\u201d Google warned. \u201cWeb applications, services, and APIs on a server or proxy able to communicate using the HTTP\/2 protocol could be vulnerable. Organizations should verify that any servers they run that support HTTP\/2 are not vulnerable, or apply vendor patches for CVE-2023-44487 to limit impact from this attack vector.\u201d\n<\/p>\n<p><strong>Related<\/strong>: <a href=\"https:\/\/www.securityweek.com\/canadian-government-targeted-with-ddos-attacks-by-pro-russia-group\/\">Canadian Government Targeted With DDoS Attacks by Pro-Russia Group<\/a>\n<\/p>\n<p><strong>Related<\/strong>: <a href=\"https:\/\/www.securityweek.com\/after-microsoft-and-x-hackers-launch-ddos-attack-on-telegram\/\">After Microsoft and X, Hackers Launch DDoS Attack on Telegram<\/a>\n<\/p>\n<p><strong>Related<\/strong>: <a href=\"https:\/\/www.securityweek.com\/cisa-releases-guidance-on-adopting-ddos-mitigations\/\">CISA Releases Guidance on Adopting DDoS Mitigations<\/a>\n<\/p>\n<p>READ MORE <a href=\"https:\/\/packetstormsecurity.com\/news\/view\/35108\/Rapid-Reset-Zero-Day-Exploited-To-Launch-Largest-DDoS-Attacks-In-History.html\">HERE<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>READ MORE HERE&#8230;<\/p>\n","protected":false},"author":2,"featured_media":54055,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[60],"tags":[10735],"class_list":["post-54054","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-packet-storm","tag-headlinehackerdenial-of-serviceflawzero-day"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Rapid Reset Zero Day Exploited To Launch Largest DDoS Attacks In History 2026 | ThreatsHub Cybersecurity News<\/title>\n<meta name=\"description\" content=\"ThreatsHub Cybersecurity News | 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