{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/http/2/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["medium"],"_cs_tags":["http/2","denial-of-service","webserver"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eA vulnerability exists in multiple HTTP/2 implementations that can be exploited by an unauthenticated, remote attacker to conduct a denial-of-service (DoS) attack. The specific details of the vulnerability aren\u0026rsquo;t disclosed in this brief, but the generic nature of the vulnerability means a wide array of servers are possibly vulnerable. Defenders need to focus on detecting anomalous HTTP/2 traffic patterns, given the lack of a specific CVE or patch information in the original source.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker establishes an HTTP/2 connection with a vulnerable server.\u003c/li\u003e\n\u003cli\u003eThe attacker sends a series of specially crafted HTTP/2 requests. Due to the vulnerability, these requests consume excessive server resources.\u003c/li\u003e\n\u003cli\u003eThe server begins to experience performance degradation due to resource exhaustion (CPU, memory, or network bandwidth).\u003c/li\u003e\n\u003cli\u003eLegitimate user requests are delayed or dropped as the server struggles to process the malicious traffic.\u003c/li\u003e\n\u003cli\u003eThe attacker continues to send malicious HTTP/2 requests, sustaining the resource exhaustion.\u003c/li\u003e\n\u003cli\u003eThe server becomes unresponsive, resulting in a denial-of-service condition for legitimate users.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability leads to a denial-of-service condition, rendering affected servers and services unavailable. The number of potential victims is broad, encompassing any system utilizing a vulnerable HTTP/2 implementation. The impact ranges from temporary service outages to prolonged periods of unavailability, causing business disruption and potential financial losses.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor web server logs for anomalous HTTP/2 traffic patterns, specifically focusing on request rates and resource consumption (CPU, memory, network) using the provided Sigma rule.\u003c/li\u003e\n\u003cli\u003eImplement rate limiting for HTTP/2 connections to mitigate the impact of excessive requests.\u003c/li\u003e\n\u003cli\u003eConsider deploying a Web Application Firewall (WAF) to inspect and filter HTTP/2 traffic for known malicious patterns.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-01T09:21:36Z","date_published":"2026-04-01T09:21:36Z","id":"/briefs/2026-04-http2-dos/","summary":"A remote, anonymous attacker can exploit a vulnerability in various HTTP/2 implementations to perform a denial-of-service attack.","title":"HTTP/2 Implementations Vulnerability Enables Denial of Service","url":"https://feed.craftedsignal.io/briefs/2026-04-http2-dos/"}],"language":"en","title":"CraftedSignal Threat Feed — Http/2","version":"https://jsonfeed.org/version/1.1"}