CVEvulnerability
CVE-2023-44487
CISA Known Exploited Vulnerability
HTTP/2 Rapid Reset Attack Vulnerability — IETF HTTP/2
HTTP/2 contains a rapid reset vulnerability that allows for a distributed denial-of-service attack (DDoS).
- Added to KEV
- 2023-10-10
- Remediation due
- 2023-10-31
- 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.
- Notes
- This vulnerability affects a common open-source component, third-party library, or protocol used by different products. For more information, please see: HTTP/2 Rapid Reset Vulnerability, CVE-2023-44487 | CISA: https://www.cisa.gov/news-events/alerts/2023/10/10/http2-rapid-reset-vulnerability-cve-2023-44487; https://blog.cloudflare.com/technical-breakdown-http2-rapid-reset-ddos-attack/; https://nvd.nist.gov/vuln/detail/CVE-2023-44487
- Status
- Analyzed
- Published
- 2023-10-10
- Last modified
- 2026-08-11
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-400
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.
Affected configurations
• siemens simatic s7-1500 cpu 1518f-4 pn\/dp mfp firmware (>= 3.1.5)
• siemens sinec ins (< 1.0)
• siemens sinec ins 1.0
• siemens sinec nms (< 3.0)
• siemens st7 scadaconnect (< 1.1)
• siemens ruggedcom ape1808 firmware
• siemens simatic s7-1500 cpu 1518-4 pn\/dp mfp firmware (>= 3.1.5)
• siemens siplus s7-1500 cpu 1518-4 pn\/dp mfp firmware (>= 3.1.5)
• ietf http 2.0
• nghttp2 nghttp2 (< 1.57.0)
• netty netty (< 4.1.100)
• envoyproxy envoy 1.24.10
• envoyproxy envoy 1.25.9
• envoyproxy envoy 1.26.4
• envoyproxy envoy 1.27.0
• eclipse jetty (< 9.4.53)
• eclipse jetty (>= 10.0.0 < 10.0.17)
• eclipse jetty (>= 11.0.0 < 11.0.17)
• eclipse jetty (>= 12.0.0 < 12.0.2)
• caddyserver caddy (< 2.7.5)
• golang go (< 1.20.10)
• golang go (>= 1.21.0 < 1.21.3)
• golang http2 (< 0.17.0)
• golang networking (< 0.17.0)
• f5 big-ip access policy manager (>= 13.1.0 <= 13.1.5)
• f5 big-ip access policy manager (>= 14.1.0 <= 14.1.5)
• f5 big-ip access policy manager (>= 15.1.0 <= 15.1.10)
• f5 big-ip access policy manager (>= 16.1.0 <= 16.1.4)
• f5 big-ip access policy manager 17.1.0
• f5 big-ip advanced firewall manager (>= 13.1.0 <= 13.1.5)
• f5 big-ip advanced firewall manager (>= 14.1.0 <= 14.1.5)
• f5 big-ip advanced firewall manager (>= 15.1.0 <= 15.1.10)
• f5 big-ip advanced firewall manager (>= 16.1.0 <= 16.1.4)
• f5 big-ip advanced firewall manager 17.1.0
• f5 big-ip advanced web application firewall (>= 13.1.0 <= 13.1.5)
• f5 big-ip advanced web application firewall (>= 14.1.0 <= 14.1.5)
• f5 big-ip advanced web application firewall (>= 15.1.0 <= 15.1.10)
• f5 big-ip advanced web application firewall (>= 16.1.0 <= 16.1.4)
• f5 big-ip advanced web application firewall 17.1.0
• f5 big-ip analytics (>= 13.1.0 <= 13.1.5)
• f5 big-ip analytics (>= 14.1.0 <= 14.1.5)
• f5 big-ip analytics (>= 15.1.0 <= 15.1.10)
• f5 big-ip analytics (>= 16.1.0 <= 16.1.4)
• f5 big-ip analytics 17.1.0
• f5 big-ip application acceleration manager (>= 13.1.0 <= 13.1.5)
• f5 big-ip application acceleration manager (>= 14.1.0 <= 14.1.5)
• f5 big-ip application acceleration manager (>= 15.1.0 <= 15.1.10)
• f5 big-ip application acceleration manager (>= 16.1.0 <= 16.1.4)
• f5 big-ip application acceleration manager 17.1.0
• f5 big-ip application security manager (>= 13.1.0 <= 13.1.5)
• f5 big-ip application security manager (>= 14.1.0 <= 14.1.5)
• f5 big-ip application security manager (>= 15.1.0 <= 15.1.10)
• f5 big-ip application security manager (>= 16.1.0 <= 16.1.4)
• f5 big-ip application security manager 17.1.0
• f5 big-ip application visibility and reporting (>= 13.1.0 <= 13.1.5)
• f5 big-ip application visibility and reporting (>= 14.1.0 <= 14.1.5)
• f5 big-ip application visibility and reporting (>= 15.1.0 <= 15.1.10)
• f5 big-ip application visibility and reporting (>= 16.1.0 <= 16.1.4)
• f5 big-ip application visibility and reporting 17.1.0
• f5 big-ip carrier-grade nat (>= 13.1.0 <= 13.1.5)
… and 224 more
Related
Weakness · CWE (1)
- CWE-400 Uncontrolled Resource Consumption weakness
References
- http://www.openwall.com/lists/oss-security/2023/10/10/6 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/10/10/7 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/10/13/4 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/10/13/9 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/10/18/4 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/10/18/8 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/10/19/6 Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2023/10/20/8 Mailing List, Third Party Advisory
- https://access.redhat.com/security/cve/cve-2023-44487 Vendor Advisory
- https://arstechnica.com/security/2023/10/how-ddosers-used-the-http-2-protocol-to-deliver-attacks-of-unprecedented-size/ Press/Media Coverage, Third Party Advisory
- https://aws.amazon.com/security/security-bulletins/AWS-2023-011/ Third Party Advisory
- https://blog.cloudflare.com/technical-breakdown-http2-rapid-reset-ddos-attack/ Technical Description, Vendor Advisory
- https://blog.cloudflare.com/zero-day-rapid-reset-http2-record-breaking-ddos-attack/ Third Party Advisory, Vendor Advisory
- https://blog.litespeedtech.com/2023/10/11/rapid-reset-http-2-vulnerablilty/ Vendor Advisory
- https://blog.qualys.com/vulnerabilities-threat-research/2023/10/10/cve-2023-44487-http-2-rapid-reset-attack Press/Media Coverage, Third Party Advisory
- https://blog.vespa.ai/cve-2023-44487/ Vendor Advisory
- https://bugzilla.proxmox.com/show_bug.cgi?id=4988 Issue Tracking, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2242803 Issue Tracking, Vendor Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=1216123 Issue Tracking, Vendor Advisory
- https://cgit.freebsd.org/ports/commit/?id=c64c329c2c1752f46b73e3e6ce9f4329be6629f9 Mailing List, Patch, Vendor Advisory
- https://cloud.google.com/blog/products/identity-security/google-cloud-mitigated-largest-ddos-attack-peaking-above-398-million-rps/ Technical Description, Vendor Advisory
- https://cloud.google.com/blog/products/identity-security/how-it-works-the-novel-http2-rapid-reset-ddos-attack Technical Description, Vendor Advisory
- https://community.traefik.io/t/is-traefik-vulnerable-to-cve-2023-44487/20125 Vendor Advisory
- https://discuss.hashicorp.com/t/hcsec-2023-32-vault-consul-and-boundary-affected-by-http-2-rapid-reset-denial-of-service-vulnerability-cve-2023-44487/59715 Third Party Advisory
- https://edg.io/lp/blog/resets-leaks-ddos-and-the-tale-of-a-hidden-cve Broken Link
- https://forums.swift.org/t/swift-nio-http2-security-update-cve-2023-44487-http-2-dos/67764 Vendor Advisory
- https://gist.github.com/adulau/7c2bfb8e9cdbe4b35a5e131c66a0c088 Issue Tracking, Patch
- https://github.com/Azure/AKS/issues/3947 Issue Tracking
- https://github.com/Kong/kong/discussions/11741 Issue Tracking
- https://github.com/advisories/GHSA-qppj-fm5r-hxr3 Vendor Advisory
- https://github.com/advisories/GHSA-vx74-f528-fxqg Mitigation, Patch, Vendor Advisory
- https://github.com/advisories/GHSA-xpw8-rcwv-8f8p Patch, Vendor Advisory
- https://github.com/akka/akka-http/issues/4323 Issue Tracking
- https://github.com/alibaba/tengine/issues/1872 Issue Tracking
- https://github.com/apache/apisix/issues/10320 Issue Tracking
- https://github.com/apache/httpd-site/pull/10 Issue Tracking
- https://github.com/apache/httpd/blob/afcdbeebbff4b0c50ea26cdd16e178c0d1f24152/modules/http2/h2_mplx.c#L1101-L1113 Product
- https://github.com/apache/tomcat/tree/main/java/org/apache/coyote/http2 Product, Third Party Advisory
- https://github.com/apache/trafficserver/pull/10564 Issue Tracking, Patch
- https://github.com/arkrwn/PoC/tree/main/CVE-2023-44487 Vendor Advisory
- https://github.com/bcdannyboy/CVE-2023-44487 Third Party Advisory
- https://github.com/caddyserver/caddy/issues/5877 Issue Tracking, Vendor Advisory
- https://github.com/caddyserver/caddy/releases/tag/v2.7.5 Release Notes, Third Party Advisory
- https://github.com/dotnet/announcements/issues/277 Issue Tracking, Mitigation, Vendor Advisory
- https://github.com/dotnet/core/blob/e4613450ea0da7fd2fc6b61dfb2c1c1dec1ce9ec/release-notes/6.0/6.0.23/6.0.23.md?plain=1#L73 Product, Release Notes
- https://github.com/eclipse/jetty.project/issues/10679 Issue Tracking
- https://github.com/envoyproxy/envoy/pull/30055 Issue Tracking, Patch
- https://github.com/etcd-io/etcd/issues/16740 Issue Tracking, Patch
- https://github.com/facebook/proxygen/pull/466 Issue Tracking, Patch
- https://github.com/golang/go/issues/63417 Issue Tracking
- https://github.com/grpc/grpc-go/pull/6703 Issue Tracking, Patch
- https://github.com/grpc/grpc/releases/tag/v1.59.2 Mailing List
- https://github.com/h2o/h2o/pull/3291 Issue Tracking, Patch
- https://github.com/h2o/h2o/security/advisories/GHSA-2m7v-gc89-fjqf Vendor Advisory
- https://github.com/haproxy/haproxy/issues/2312 Issue Tracking
- https://github.com/icing/mod_h2/blob/0a864782af0a942aa2ad4ed960a6b32cd35bcf0a/mod_http2/README.md?plain=1#L239-L244 Product
- https://github.com/junkurihara/rust-rpxy/issues/97 Issue Tracking
- https://github.com/kazu-yamamoto/http2/commit/f61d41a502bd0f60eb24e1ce14edc7b6df6722a1 Patch
- https://github.com/kazu-yamamoto/http2/issues/93 Issue Tracking
- https://github.com/kubernetes/kubernetes/pull/121120 Issue Tracking, Patch
- https://github.com/line/armeria/pull/5232 Issue Tracking, Patch
- https://github.com/linkerd/website/pull/1695/commits/4b9c6836471bc8270ab48aae6fd2181bc73fd632 Patch
- https://github.com/micrictor/http2-rst-stream Exploit, Third Party Advisory
- https://github.com/microsoft/CBL-Mariner/pull/6381 Issue Tracking, Patch
- https://github.com/netty/netty/commit/58f75f665aa81a8cbcf6ffa74820042a285c5e61 Patch
- https://github.com/nghttp2/nghttp2/pull/1961 Issue Tracking, Patch
- https://github.com/nghttp2/nghttp2/releases/tag/v1.57.0 Release Notes
- https://github.com/ninenines/cowboy/issues/1615 Issue Tracking
- https://github.com/nodejs/node/pull/50121 Issue Tracking
- https://github.com/openresty/openresty/issues/930 Issue Tracking
- https://github.com/opensearch-project/data-prepper/issues/3474 Issue Tracking, Patch
- https://github.com/oqtane/oqtane.framework/discussions/3367 Issue Tracking
- https://github.com/projectcontour/contour/pull/5826 Issue Tracking, Patch
- https://github.com/tempesta-tech/tempesta/issues/1986 Issue Tracking
- https://github.com/varnishcache/varnish-cache/issues/3996 Issue Tracking
- https://groups.google.com/g/golang-announce/c/iNNxDTCjZvo Mailing List, Release Notes, Vendor Advisory
- https://istio.io/latest/news/security/istio-security-2023-004/ Vendor Advisory
- https://linkerd.io/2023/10/12/linkerd-cve-2023-44487/ Vendor Advisory
- https://lists.apache.org/thread/5py8h42mxfsn8l1wy6o41xwhsjlsd87q Mailing List
- https://lists.debian.org/debian-lts-announce/2023/10/msg00020.html Mailing List, Third Party Advisory