CVE-2023-44487: HTTP/2 Rapid Reset Attack Vulnerability
In CISA’s Known Exploited Vulnerabilities catalog: HTTP/2 Rapid Reset Attack Vulnerability.
Added , federal remediation due . Known ransomware use: Unknown.
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Description
The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
ietf: httpSiemens: RUGGEDCOM APE1808Siemens: SIMATIC S7-1500 CPU 1518-4 PN/DP MFPSiemens: SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPSiemens: SINEC NMSSiemens: SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- aws.amazon.com/security/security-bulletins/AWS-2023-011/ (opens in new tab)
- blog.cloudflare.com/technical-breakdown-http2-rapid-reset-ddos-attack/ (opens in new tab)
- blog.cloudflare.com/zero-day-rapid-reset-http2-record-breaking-ddos-attack/ (opens in new tab)
- bugzilla.proxmox.com/show_bug.cgi (opens in new tab)
- cgit.freebsd.org/ports/commit/ (opens in new tab)
- cloud.google.com/blog/products/identity-security/google-cloud-mitigated-largest-ddos-a… (opens in new tab)
- cloud.google.com/blog/products/identity-security/how-it-works-the-novel-http2-rapid-re… (opens in new tab)
- edg.io/lp/blog/resets-leaks-ddos-and-the-tale-of-a-hidden-cve (opens in new tab)
- forums.swift.org/t/swift-nio-http2-security-update-cve-2023-44487-http-2-dos/67764 (opens in new tab)
- gist.github.com/adulau/7c2bfb8e9cdbe4b35a5e131c66a0c088 (opens in new tab)
- github.com/alibaba/tengine/issues/1872 (opens in new tab)
- github.com/apache/tomcat/tree/main/java/org/apache/coyote/http2 (opens in new tab)
- github.com/bcdannyboy/CVE-2023-44487 (opens in new tab)
- github.com/caddyserver/caddy/issues/5877 (opens in new tab)
- github.com/dotnet/core/blob/e4613450ea0da7fd2fc6b61dfb2c1c1dec1ce9ec/release-not… (opens in new tab)
- github.com/eclipse/jetty.project/issues/10679 (opens in new tab)
- github.com/envoyproxy/envoy/pull/30055 (opens in new tab)
- github.com/facebook/proxygen/pull/466 (opens in new tab)
- github.com/grpc/grpc-go/pull/6703 (opens in new tab)
- github.com/haproxy/haproxy/issues/2312 (opens in new tab)
- github.com/icing/mod_h2/blob/0a864782af0a942aa2ad4ed960a6b32cd35bcf0a/mod_http2/… (opens in new tab)
- github.com/micrictor/http2-rst-stream (opens in new tab)
- github.com/microsoft/CBL-Mariner/pull/6381 (opens in new tab)
- github.com/netty/netty/commit/58f75f665aa81a8cbcf6ffa74820042a285c5e61 (opens in new tab)
- github.com/nghttp2/nghttp2/pull/1961 (opens in new tab)
- github.com/nghttp2/nghttp2/releases/tag/v1.57.0 (opens in new tab)
- groups.google.com/g/golang-announce/c/iNNxDTCjZvo (opens in new tab)
- mailman.nginx.org/pipermail/nginx-devel/2023-October/S36Q5HBXR7CAIMPLLPRSSSYR4PCMWILK.h… (opens in new tab)
- msrc.microsoft.com/blog/2023/10/microsoft-response-to-distributed-denial-of-service-ddos… (opens in new tab)
- my.f5.com/manage/s/article/K000137106 (opens in new tab)
- news.ycombinator.com/item (opens in new tab)
- news.ycombinator.com/item (opens in new tab)
- news.ycombinator.com/item (opens in new tab)
- openssf.org/blog/2023/10/10/http-2-rapid-reset-vulnerability-highlights-need-for-… (opens in new tab)
- seanmonstar.com/post/730794151136935936/hyper-http2-rapid-reset-unaffected (opens in new tab)
- www.bleepingcomputer.com/news/security/new-http-2-rapid-reset-zero-day-attack-breaks-ddos-reco… (opens in new tab)
- www.nginx.com/blog/http-2-rapid-reset-attack-impacting-f5-nginx-products/ (opens in new tab)
- www.phoronix.com/news/HTTP2-Rapid-Reset-Attack (opens in new tab)
- www.openwall.com/lists/oss-security/2023/10/10/6 (opens in new tab)
- www.openwall.com/lists/oss-security/2023/10/10/7 (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)