NVD Description

Note: Versions mentioned in the description apply only to the upstream nghttp2 package and not the nghttp2 package as distributed by Ubuntu.
See How to fix? for Ubuntu:22.04 relevant fixed versions and status.

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.

Remediation

Upgrade Ubuntu:22.04 nghttp2 to version 1.43.0-1ubuntu0.1 or higher.

References

• http://people.ubuntu.com/~ubuntu-security/cve/CVE-2023-44487
• https://chaos.social/@icing/111210915918780532
• hyper is not affected by CVE-2023-44487 hyperium/hyper#3337
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2MBEPPC36UBVOZZNAXFHKLFGSLCMN5LI/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3N4NJ7FR4X4FPZUGNTQAPSTVB2HB2Y4A/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFQD3KUEMFBHPAPBGLWQC34L4OWL5HAZ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CLB4TW7KALB3EEQWNWCN7OUIWWVWWCG2/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E72T67UPDRXHIDLO3OROR25YAMN4GGW5/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FNA62Q767CFAFHBCDKYNPBMZWB7TWYVU/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HT7T2R4MQKLIF4ODV4BDLPARWFPCJ5CZ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JIZSEFC3YKCGABA2BZW6ZJRMDZJMB7PJ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JMEXY22BFG5Q64HQCM5CK2Q7KDKVV4TY/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KSEGD2IWKNUO3DWY4KQGUQM5BISRWHQE/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LKYHSZQFDNR7RSA7LHVLLIAQMVYCUGBG/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LNMZJCDHGLJJLXO4OXWJMTVQRNWOC7UL/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VHUHTSXLXGXS7JYKBXTA3VINUPHTNGVU/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VSRDIV77HNKUSM7SJC5BKE5JSHLHU2NK/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WE2I52RHNNU42PX6NZ2RBUHSFFJ2LVZX/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WLPRQ5TWUQQXYWBJM7ECYDAIL2YVKIUH/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X6QXN4ORIVF6XBW4WWFE7VNPVC74S45Y/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XFOIBB4YFICHDM7IBOP7PWXW3FX4HLL2/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZB43REMKRQR62NJEI7I5NQ4FSXNLBKRT/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZKQSIKIAT5TJ3WSLU3RDBQ35YX4GY4V3/
• https://www.vicarius.io/vsociety/posts/rapid-reset-cve-2023-44487-dos-in-http2-understanding-the-root-cause
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLU6U2R2IC2K64NDPNMV55AUAO65MAF4/
• http://www.openwall.com/lists/oss-security/2023/10/10/6
• http://www.openwall.com/lists/oss-security/2023/10/10/7
• https://github.com/grpc/grpc/releases/tag/v1.59.2
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2MBEPPC36UBVOZZNAXFHKLFGSLCMN5LI/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3N4NJ7FR4X4FPZUGNTQAPSTVB2HB2Y4A/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BFQD3KUEMFBHPAPBGLWQC34L4OWL5HAZ/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CLB4TW7KALB3EEQWNWCN7OUIWWVWWCG2/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/E72T67UPDRXHIDLO3OROR25YAMN4GGW5/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FNA62Q767CFAFHBCDKYNPBMZWB7TWYVU/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HT7T2R4MQKLIF4ODV4BDLPARWFPCJ5CZ/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JIZSEFC3YKCGABA2BZW6ZJRMDZJMB7PJ/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JMEXY22BFG5Q64HQCM5CK2Q7KDKVV4TY/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KSEGD2IWKNUO3DWY4KQGUQM5BISRWHQE/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LKYHSZQFDNR7RSA7LHVLLIAQMVYCUGBG/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LNMZJCDHGLJJLXO4OXWJMTVQRNWOC7UL/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VHUHTSXLXGXS7JYKBXTA3VINUPHTNGVU/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VSRDIV77HNKUSM7SJC5BKE5JSHLHU2NK/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WE2I52RHNNU42PX6NZ2RBUHSFFJ2LVZX/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WLPRQ5TWUQQXYWBJM7ECYDAIL2YVKIUH/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X6QXN4ORIVF6XBW4WWFE7VNPVC74S45Y/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XFOIBB4YFICHDM7IBOP7PWXW3FX4HLL2/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZB43REMKRQR62NJEI7I5NQ4FSXNLBKRT/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZKQSIKIAT5TJ3WSLU3RDBQ35YX4GY4V3/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZLU6U2R2IC2K64NDPNMV55AUAO65MAF4/
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-http2-reset-d8Kf32vZ
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-44487
• http://www.openwall.com/lists/oss-security/2023/10/13/4
• http://www.openwall.com/lists/oss-security/2023/10/13/9
• http://www.openwall.com/lists/oss-security/2023/10/18/4
• http://www.openwall.com/lists/oss-security/2023/10/18/8
• http://www.openwall.com/lists/oss-security/2023/10/19/6
• http://www.openwall.com/lists/oss-security/2023/10/20/8
• http://www.openwall.com/lists/oss-security/2025/08/13/6
• https://access.redhat.com/security/cve/cve-2023-44487
• https://arstechnica.com/security/2023/10/how-ddosers-used-the-http-2-protocol-to-deliver-attacks-of-unprecedented-size/
• https://aws.amazon.com/security/security-bulletins/AWS-2023-011/
• https://blog.cloudflare.com/technical-breakdown-http2-rapid-reset-ddos-attack/
• https://blog.cloudflare.com/zero-day-rapid-reset-http2-record-breaking-ddos-attack/
• https://blog.litespeedtech.com/2023/10/11/rapid-reset-http-2-vulnerablilty/
• https://blog.qualys.com/vulnerabilities-threat-research/2023/10/10/cve-2023-44487-http-2-rapid-reset-attack
• https://blog.vespa.ai/cve-2023-44487/
• https://bugzilla.proxmox.com/show_bug.cgi?id=4988
• https://bugzilla.redhat.com/show_bug.cgi?id=2242803
• https://bugzilla.suse.com/show_bug.cgi?id=1216123
• https://cgit.freebsd.org/ports/commit/?id=c64c329c2c1752f46b73e3e6ce9f4329be6629f9
• https://cloud.google.com/blog/products/identity-security/google-cloud-mitigated-largest-ddos-attack-peaking-above-398-million-rps/
• https://cloud.google.com/blog/products/identity-security/how-it-works-the-novel-http2-rapid-reset-ddos-attack
• https://community.traefik.io/t/is-traefik-vulnerable-to-cve-2023-44487/20125
• 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
• https://edg.io/lp/blog/resets-leaks-ddos-and-the-tale-of-a-hidden-cve
• https://forums.swift.org/t/swift-nio-http2-security-update-cve-2023-44487-http-2-dos/67764
• https://gist.github.com/adulau/7c2bfb8e9cdbe4b35a5e131c66a0c088
• CVE-2023-44487: Distributed Denial of Service (DDoS) Attacks against HTTP/2 Azure/AKS#3947
• HTTP2 Rapid Reset - CVE-2023-44487 Kong/kong#11741
• GHSA-qppj-fm5r-hxr3
• GHSA-vx74-f528-fxqg
• GHSA-xpw8-rcwv-8f8p
• CVE-2023-44487  akka/akka-http#4323
• CVE-2023-44487: HTTP/2 Rapid Reset Attack alibaba/tengine#1872
• help request: What's the action for CVE-2023-44487 ? apache/apisix#10320
• Document non-impact of CVE-2023-44487 apache/httpd-site#10
• https://github.com/apache/httpd/blob/afcdbeebbff4b0c50ea26cdd16e178c0d1f24152/modules/http2/h2_mplx.c#L1101-L1113
• https://github.com/apache/tomcat/tree/main/java/org/apache/coyote/http2
• Add an HTTP/2 related rate limiting apache/trafficserver#10564
• https://github.com/arkrwn/PoC/tree/main/CVE-2023-44487
• https://github.com/bcdannyboy/CVE-2023-44487
• HTTP/2 Rapid Reset : CVE-2023-44487 caddyserver/caddy#5877
• https://github.com/caddyserver/caddy/releases/tag/v2.7.5
• Microsoft Security Advisory CVE-2023-44487: .NET Denial of Service Vulnerability dotnet/announcements#277
• https://github.com/dotnet/core/blob/e4613450ea0da7fd2fc6b61dfb2c1c1dec1ce9ec/release-notes/6.0/6.0.23/6.0.23.md?plain=1#L73
• Allow HTTP/2 rate control to mitigate HTTP/2 floods (CVE-2023-44487) jetty/jetty.project#10679
• http: Fix CVE CVE-2023-44487 envoyproxy/envoy#30055
• Resolve CVE-2023-44487 etcd-io/etcd#16740
• Re-sync with internal repository following CVE-2023-44487 facebook/proxygen#466
• net/http, x/net/http2: rapid stream resets can cause excessive work (CVE-2023-39325) golang/go#63417
• server: prohibit more than MaxConcurrentStreams handlers from running at once grpc/grpc-go#6703
• [http2] rapid reset attack h2o/h2o#3291
• GHSA-2m7v-gc89-fjqf
• H2 rapid reset aka CVE-2023-44487 haproxy/haproxy#2312
• https://github.com/icing/mod_h2/blob/0a864782af0a942aa2ad4ed960a6b32cd35bcf0a/mod_http2/README.md?plain=1#L239-L244
• [Announcement] CVE-2023-44487 (HTTP/2 Rapid Reset Attack) does not affect rpxy junkurihara/rust-rpxy#97
• kazu-yamamoto/http2@f61d41a
• Does this recent http2 CVE affect this package? kazu-yamamoto/http2#93
• Prevent rapid reset http2 DOS on API server kubernetes/kubernetes#121120
• Limit max reset frames to mitigate HTTP/2 RST floods line/armeria#5232
• linkerd/website@4b9c683
• https://github.com/micrictor/http2-rst-stream
• Fix for nginx and golang for CVE-2023-44487 microsoft/azurelinux#6381
• netty/netty@58f75f6
• Rework session management nghttp2/nghttp2#1961
• https://github.com/nghttp2/nghttp2/releases/tag/v1.57.0
• Is Cowboy affected by the HTTP/2 Rapid Reset attack? ninenines/cowboy#1615
• deps: update nghttp2 to 1.57.0 nodejs/node#50121
• CVE-2023-44487 issue/fix? openresty/openresty#930
• CVE-2023-44487 (High) detected in multiple libraries opensearch-project/data-prepper#3474
• .NET 7 security vulernability Kestrel Server HTTP/2 oqtane/oqtane.framework#3367
• Set stream limits for HTTP2 protocol - CVE CVE-2023-44487 projectcontour/contour#5826
• HTTP/2 Rapid Reset DDoS Mitigaton tempesta-tech/tempesta#1986
• Handling of CVE-2023-44487 / HTTP2 Rapid Reset varnishcache/varnish-cache#3996
• https://groups.google.com/g/golang-announce/c/iNNxDTCjZvo
• https://istio.io/latest/news/security/istio-security-2023-004/
• https://linkerd.io/2023/10/12/linkerd-cve-2023-44487/
• https://lists.apache.org/thread/5py8h42mxfsn8l1wy6o41xwhsjlsd87q
• https://lists.debian.org/debian-lts-announce/2023/10/msg00020.html
• https://lists.debian.org/debian-lts-announce/2023/10/msg00023.html
• https://lists.debian.org/debian-lts-announce/2023/10/msg00024.html
• https://lists.debian.org/debian-lts-announce/2023/10/msg00045.html
• https://lists.debian.org/debian-lts-announce/2023/10/msg00047.html
• https://lists.debian.org/debian-lts-announce/2023/11/msg00001.html
• https://lists.debian.org/debian-lts-announce/2023/11/msg00012.html
• https://lists.w3.org/Archives/Public/ietf-http-wg/2023OctDec/0025.html
• https://mailman.nginx.org/pipermail/nginx-devel/2023-October/S36Q5HBXR7CAIMPLLPRSSSYR4PCMWILK.html
• https://martinthomson.github.io/h2-stream-limits/draft-thomson-httpbis-h2-stream-limits.html
• https://msrc.microsoft.com/blog/2023/10/microsoft-response-to-distributed-denial-of-service-ddos-attacks-against-http/2/
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-44487
• https://my.f5.com/manage/s/article/K000137106
• https://netty.io/news/2023/10/10/4-1-100-Final.html
• https://news.ycombinator.com/item?id=37830987
• https://news.ycombinator.com/item?id=37830998
• https://news.ycombinator.com/item?id=37831062
• https://news.ycombinator.com/item?id=37837043
• https://openssf.org/blog/2023/10/10/http-2-rapid-reset-vulnerability-highlights-need-for-rapid-response/
• https://seanmonstar.com/post/730794151136935936/hyper-http2-rapid-reset-unaffected
• https://security.gentoo.org/glsa/202311-09
• https://security.netapp.com/advisory/ntap-20231016-0001/
• https://security.netapp.com/advisory/ntap-20240426-0007/
• https://security.netapp.com/advisory/ntap-20240621-0006/
• https://security.netapp.com/advisory/ntap-20240621-0007/
• https://security.paloaltonetworks.com/CVE-2023-44487
• https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.14
• https://ubuntu.com/security/CVE-2023-44487
• https://www.bleepingcomputer.com/news/security/new-http-2-rapid-reset-zero-day-attack-breaks-ddos-records/
• https://www.cisa.gov/news-events/alerts/2023/10/10/http2-rapid-reset-vulnerability-cve-2023-44487
• https://www.darkreading.com/cloud/internet-wide-zero-day-bug-fuels-largest-ever-ddos-event
• https://www.debian.org/security/2023/dsa-5521
• https://www.debian.org/security/2023/dsa-5522
• https://www.debian.org/security/2023/dsa-5540
• https://www.debian.org/security/2023/dsa-5549
• https://www.debian.org/security/2023/dsa-5558
• https://www.debian.org/security/2023/dsa-5570
• https://www.haproxy.com/blog/haproxy-is-not-affected-by-the-http-2-rapid-reset-attack-cve-2023-44487
• https://www.netlify.com/blog/netlify-successfully-mitigates-cve-2023-44487/
• https://www.nginx.com/blog/http-2-rapid-reset-attack-impacting-f5-nginx-products/
• https://www.openwall.com/lists/oss-security/2023/10/10/6
• https://www.phoronix.com/news/HTTP2-Rapid-Reset-Attack
• https://www.theregister.com/2023/10/10/http2_rapid_reset_zeroday/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• https://github.com/Appsynergy-io/CVE-2023-44487
• https://www.exploit-db.com/exploits/52426