CVE-2023-44487

CRITICALPre-NVD 7.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2023-10-10), indicating real-world exploitation has been confirmed by US federal agencies. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa-adp, cisa_kev, epss
Trending — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • 3,521 internet-exposed hosts are running an affected version right now
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 100%CVSS: 7.5Exploit: cisa kev · ssvc active · epss top5pct · epss high · public exploitExposed: 3,521

A fix is available — apply it.

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.

Live · internet exposure

3,521 internet-exposed hosts are running an affected version of CVE-2023-44487 right now.

across 95 countries (United States, Germany, China, Japan, France)top: http_server, nginx, jenkins
See the live KEV-Exposure radar →Found passively from public internet-scan data — aggregate, host-redacted.

EchelonGraph is the only CVE feed that fuses live vulnerability intelligence with its own live internet-exposure radar — so you see not just that a CVE is exploited, but how much of the internet is exposed to it right now.

CVSS v3
7.5
EG Score
9.0(high)
EG Risk
96(Attend)
EG Risk 96/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
100%
EPSS %ILE
100%
KEV
⚠ Exploited

Published

October 10, 2023

Last Modified

July 14, 2026

Advisory Details (10)

Auto-updated May 20, 2026
Patch available. Sources: redhat.
generic

Biggest DDoSes of all time generated by protocol 0-day in HTTP/2 - Ars Technica

https://arstechnica.com/security/2023/10/how-ddosers-used-the-http-2-protocol-to-deliver-attacks-of-unprecedented-size/
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/cve-2023-44487
generic

oss-security - Re: CVE-2023-44487: HTTP/2 Rapid Reset attack against many implementations

http://www.openwall.com/lists/oss-security/2023/10/20/8
generic

oss-security - CVE-2023-45802: Apache HTTP Server: HTTP/2 stream memory not reclaimed right away on RST

http://www.openwall.com/lists/oss-security/2023/10/19/6
generic

oss-security - Re: CVE-2023-44487: HTTP/2 Rapid Reset attack against many implementations

http://www.openwall.com/lists/oss-security/2023/10/18/8
generic

oss-security - Vulnerability in Jenkins

http://www.openwall.com/lists/oss-security/2023/10/18/4
generic

oss-security - Re: CVE-2023-44487: HTTP/2 Rapid Reset attack against many implementations

http://www.openwall.com/lists/oss-security/2023/10/13/9
generic

oss-security - Re: CVE-2023-44487: HTTP/2 Rapid Reset attack against many implementations

http://www.openwall.com/lists/oss-security/2023/10/13/4
generic

oss-security - Re: CVE-2023-44487: HTTP/2 Rapid Reset attack against many implementations

http://www.openwall.com/lists/oss-security/2023/10/10/7
generic

oss-security - CVE-2023-44487: HTTP/2 Rapid Reset attack against many implementations

http://www.openwall.com/lists/oss-security/2023/10/10/6

Vendor Advisories for CVE-2023-44487(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatmulticluster-engine/kube-rbac-proxy-mce-rhel9:17662743242026-01-15redhat
redhatrhacm2/kube-rbac-proxy-rhel9:v2.112025-12-17redhat
redhatmulticluster-engine/kube-rbac-proxy-mce-rhel9:v2.62025-12-17redhat
redhateap7-wildfly-0:7.1.12-2.GA_redhat_00002.1.ep7.el72025-09-25redhat
redhatdevspaces/udi-rhel8:3.15-52024-07-18redhat
redhatrhceph/snmp-notifier-rhel9:1.2.1-572024-05-01redhat
redhathelm-0:3.13.2-35.el92024-04-18redhat
redhatopenshift4/ovirt-csi-driver-rhel8-operator:v4.15.0-202404030309.p0.ge9b0fa2.assembly.stream.el82024-04-16redhat
redhatnodejs:16-8090020240315081818.a75119d52024-03-20redhat
redhatrhdh/rhdh-hub-rhel9:1.1-972024-03-18redhat
redhatkube-descheduler-operator/kube-descheduler-rhel9-operator:v5.0-142024-03-06redhat
redhatrun-once-duration-override-operator/run-once-duration-override-rhel9-operator:v1.1-52024-02-28redhat
redhatopenshift4/ovirt-csi-driver-rhel9:v4.15.0-202401261531.p0.gb8d25ad.assembly.stream2024-02-27redhat
redhatopenshift-sandboxed-containers/osc-rhel9-operator:1.5.2-32024-02-15redhat
redhatjenkins-0:2.426.3.1706516352-3.el82024-02-12redhat
redhatalbo/aws-load-balancer-rhel8-operator:1.1.1-12024-01-30redhat
redhatmta/mta-cli-rhel9:7.0.0-442024-01-30redhat
redhatopenshift4/ose-openshift-apiserver-rhel8:v4.13.0-202312040608.p0.g6c07330.assembly.stream2023-12-13redhat
redhatopenshift4/ose-gcp-cloud-controller-manager-rhel8:v4.14.0-202311300410.p0.g09e96a9.assembly.stream2023-12-12redhat
redhatrhceph/rhceph-6-dashboard-rhel9:6-822023-12-12redhat
redhatopenshift-pipelines/pipelines-workingdirinit-rhel8:v1.10.6-102023-12-07redhat
redhatcontainer-native-virtualization/virt-artifacts-server-rhel9:v4.14.1-42023-12-07redhat
redhatopenshift-pipelines-client-0:1.10.6-11031.el82023-12-07redhat
redhatcri-o-0:1.25.5-2.rhaos4.12.git0217273.el82023-12-06redhat
redhatundertow2023-12-05redhat
redhateap7-wildfly-0:7.4.14-5.GA_redhat_00002.1.el9eap2023-12-04redhat
redhateap7-wildfly-transaction-client-0:1.1.16-1.Final_redhat_00001.1.el7eap2023-12-04redhat
redhatpatch2023-12-04redhat
redhateap7-wildfly-transaction-client-0:1.1.16-1.Final_redhat_00001.1.el8eap2023-12-04redhat
redhatcri-o-0:1.24.6-6.1.rhaos4.11.git7f73171.el8_62023-11-29redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(12 across 3 ecosystems)
Maven(10)
PackageVulnerable rangeFixed inDependents
com.typesafe.akka:akka-http-core3.0.0-RC110.5.3—
com.typesafe.akka:akka-http-core_2.1110.0.0 ... 3.0.0-RC1 (58 versions)——
com.typesafe.akka:akka-http-core_2.1210.0.0 ... 10.5.2 (59 versions)10.5.3—
com.typesafe.akka:akka-http-core_2.1310.1.10 ... 10.5.2 (31 versions)10.5.3—
org.apache.tomcat.embed:tomcat-embed-core8.5.0 ... 8.5.93 (78 versions)8.5.94—
org.apache.tomcat:tomcat-coyote8.5.0 ... 8.5.93 (78 versions)8.5.94—
org.eclipse.jetty.http2:http2-common11.0.0 ... 11.0.9 (17 versions)11.0.17—
org.eclipse.jetty.http2:http2-server11.0.0 ... 11.0.9 (17 versions)11.0.17—
org.eclipse.jetty.http2:jetty-http2-common12.0.0, 12.0.112.0.2—
org.eclipse.jetty.http2:jetty-http2-server12.0.0, 12.0.112.0.2—
Go(1)
PackageVulnerable rangeFixed inDependents
golang.org/x/net—0.17.0—
Swift(1)
PackageVulnerable rangeFixed inDependents
github.com/apple/swift-nio-http2—1.28.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(22)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 28× in last 7d / 172× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 388 total refreshes for this CVE.

  1. 2026-07-27 03:03 UTCVendor advisory
  2. 2026-07-26 22:52 UTCVendor advisory
  3. 2026-07-26 18:42 UTCVendor advisory
  4. 2026-07-26 14:31 UTCEG score recompute
  5. 2026-07-26 14:31 UTCVendor advisory
  6. 2026-07-26 10:21 UTCVendor advisory
  7. 2026-07-26 06:08 UTCVendor advisory
  8. 2026-07-26 01:55 UTCVendor advisory
  9. 2026-07-23 02:27 UTCEG score recompute
  10. 2026-07-22 21:38 UTCEG score recompute
  11. 2026-07-22 21:38 UTCVendor advisory
  12. 2026-07-22 19:40 UTCCISA KEV update
  13. 2026-07-22 17:13 UTCVendor advisory
  14. 2026-07-22 13:02 UTCVendor advisory
  15. 2026-07-22 08:52 UTCVendor advisory
  16. 2026-07-22 04:41 UTCVendor advisory
  17. 2026-07-22 00:30 UTCVendor advisory
  18. 2026-07-21 20:20 UTCVendor advisory
  19. 2026-07-21 16:08 UTCVendor advisory
  20. 2026-07-21 14:37 UTCCISA KEV update
  21. 2026-07-21 11:57 UTCVendor advisory
  22. 2026-07-21 07:46 UTCVendor advisory
  23. 2026-07-21 03:36 UTCVendor advisory
  24. 2026-07-20 23:26 UTCVendor advisory
  25. 2026-07-20 19:14 UTCVendor advisory
Show 75 more
  1. 2026-07-20 15:02 UTCVendor advisory
  2. 2026-07-20 10:51 UTCVendor advisory
  3. 2026-07-20 06:40 UTCVendor advisory
  4. 2026-07-20 01:51 UTCVendor advisory
  5. 2026-07-19 21:41 UTCVendor advisory
  6. 2026-07-19 17:30 UTCVendor advisory
  7. 2026-07-19 13:20 UTCVendor advisory
  8. 2026-07-19 09:10 UTCVendor advisory
  9. 2026-07-19 05:00 UTCVendor advisory
  10. 2026-07-19 00:50 UTCVendor advisory
  11. 2026-07-18 20:39 UTCVendor advisory
  12. 2026-07-18 16:29 UTCVendor advisory
  13. 2026-07-18 12:18 UTCVendor advisory
  14. 2026-07-18 08:07 UTCVendor advisory
  15. 2026-07-18 03:56 UTCVendor advisory
  16. 2026-07-17 23:46 UTCVendor advisory
  17. 2026-07-17 19:36 UTCVendor advisory
  18. 2026-07-17 15:26 UTCVendor advisory
  19. 2026-07-17 11:16 UTCVendor advisory
  20. 2026-07-17 07:05 UTCEG score recompute
  21. 2026-07-17 07:05 UTCVendor advisory
  22. 2026-07-17 02:55 UTCVendor advisory
  23. 2026-07-16 22:45 UTCVendor advisory
  24. 2026-07-16 18:35 UTCVendor advisory
  25. 2026-07-16 17:04 UTCCISA KEV update
  26. 2026-07-16 14:25 UTCVendor advisory
  27. 2026-07-16 10:13 UTCVendor advisory
  28. 2026-07-16 06:02 UTCVendor advisory
  29. 2026-07-16 01:52 UTCVendor advisory
  30. 2026-07-15 21:42 UTCVendor advisory
  31. 2026-07-15 17:30 UTCVendor advisory
  32. 2026-07-15 16:49 UTCCISA KEV update
  33. 2026-07-15 15:04 UTCCISA KEV update
  34. 2026-07-15 13:18 UTCVendor advisory
  35. 2026-07-15 09:07 UTCVendor advisory
  36. 2026-07-15 04:55 UTCVendor advisory
  37. 2026-07-15 00:44 UTCVendor advisory
  38. 2026-07-14 20:34 UTCVendor advisory
  39. 2026-07-14 18:05 UTCCISA KEV update
  40. 2026-07-14 16:22 UTCVendor advisory
  41. 2026-07-14 12:11 UTCVendor advisory
  42. 2026-07-14 08:01 UTCVendor advisory
  43. 2026-07-14 03:49 UTCVendor advisory
  44. 2026-07-13 23:39 UTCVendor advisory
  45. 2026-07-13 19:29 UTCVendor advisory
  46. 2026-07-13 17:07 UTCCISA KEV update
  47. 2026-07-13 15:19 UTCVendor advisory
  48. 2026-07-13 11:07 UTCVendor advisory
  49. 2026-07-13 06:57 UTCVendor advisory
  50. 2026-07-13 02:46 UTCVendor advisory
  51. 2026-07-12 22:36 UTCVendor advisory
  52. 2026-07-12 18:26 UTCVendor advisory
  53. 2026-07-12 14:16 UTCVendor advisory
  54. 2026-07-12 10:05 UTCVendor advisory
  55. 2026-07-12 05:55 UTCVendor advisory
  56. 2026-07-12 01:44 UTCVendor advisory
  57. 2026-07-11 21:34 UTCVendor advisory
  58. 2026-07-11 17:24 UTCVendor advisory
  59. 2026-07-11 13:14 UTCVendor advisory
  60. 2026-07-11 09:04 UTCVendor advisory
  61. 2026-07-11 04:53 UTCVendor advisory
  62. 2026-07-11 00:43 UTCVendor advisory
  63. 2026-07-10 20:32 UTCVendor advisory
  64. 2026-07-10 17:52 UTCCISA KEV update
  65. 2026-07-10 16:22 UTCVendor advisory
  66. 2026-07-10 12:12 UTCVendor advisory
  67. 2026-07-10 08:01 UTCVendor advisory
  68. 2026-07-10 03:50 UTCVendor advisory
  69. 2026-07-09 23:40 UTCVendor advisory
  70. 2026-07-09 19:30 UTCVendor advisory
  71. 2026-07-09 15:19 UTCVendor advisory
  72. 2026-07-09 11:09 UTCVendor advisory
  73. 2026-07-09 06:58 UTCVendor advisory
  74. 2026-07-09 02:48 UTCVendor advisory
  75. 2026-07-08 22:38 UTCVendor advisory

Publicly available exploits

(10 references)

Working exploit code is in the public domain (9 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCtpirate/cve-2023-44487-POC
    First seen Dec 14, 2025

    poc for the rst dos attack discovered in 2023

    Open source ↗
  • Exploit-DBEDB-52426
    First seen Sep 16, 2025

    HTTP/2 2.0 - Denial Of Service (DOS)

    Open source ↗
  • GitHub PoCmoften/CVE-2023-44487-HTTP-2-Rapid-Reset-Attack
    First seen Apr 14, 2025

    HTTP/2 Rapid Reset Exploit PoC

    Open source ↗
  • GitHub PoCthreatlabindonesia/CVE-2023-44487-HTTP-2-Rapid-Reset-Exploit-PoC
    First seen Dec 3, 2024
    Open source ↗
  • GitHub PoCnxenon/cve-2023-44487
    First seen Nov 10, 2023

    Examples for Implementing cve-2023-44487 ( HTTP/2 Rapid Reset Attack ) Concept

    Open source ↗
  • GitHub PoCndrscodes/http2-rst-stream-attacker
    First seen Nov 8, 2023

    Highly configurable tool to check a server's vulnerability against CVE-2023-44487 by rapidly sending HEADERS and RST_STREAM frames and documenting the server's responses.

    Open source ↗
  • GitHub PoCReToCode/golang-CVE-2023-44487
    First seen Oct 25, 2023
    Open source ↗
  • GitHub PoCstudiogangster/CVE-2023-44487
    First seen Oct 16, 2023

    A python based exploit to test out rapid reset attack (CVE-2023-44487)

    Open source ↗
  • GitHub PoCsecengjeff/rapidresetclient
    First seen Oct 13, 2023

    Tool for testing mitigations and exposure to Rapid Reset DDoS (CVE-2023-44487)

    Open source ↗
  • GitHub PoCAppsynergy-io/CVE-2023-44487
    First seen Oct 11, 2023

    Proof of concept for DoS exploit

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2023-44487?
CVE-2023-44487 is a critical vulnerability published on October 10, 2023. 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.
When was CVE-2023-44487 disclosed?
CVE-2023-44487 was first published in the National Vulnerability Database on October 10, 2023, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-44487 actively exploited?
Yes. CISA added CVE-2023-44487 to the Known Exploited Vulnerabilities catalog on October 10, 2023, affecting IETF HTTP/2. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2023-44487?
CVE-2023-44487 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2023-44487?
CVE-2023-44487 affects IETF HTTP/2. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2023-44487?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-44487, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-44487

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