CVE-2023-44487

HIGHNVD 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. NVD baseline CVSS 7.5 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, nvd
Trending — 4 sources updated this weekExploited in the wild
7.5
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • 1,535 internet-exposed hosts are running an affected version right now
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 100%CVSS: 7.5Exploit: NoneExposed: 1,535

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

1,535 internet-exposed hosts are running an affected version of CVE-2023-44487 right now.

across 76 countries (United States, Germany, China, Japan, France)top: http_server, jenkins, nginx
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)
EPSS
100.0%
KEV
⚠ Exploited

Published

October 10, 2023

Last Modified

June 17, 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
redhatmulticluster-engine/kube-rbac-proxy-mce-rhel9:v2.62025-12-17redhat
redhatrhacm2/kube-rbac-proxy-rhel9:v2.112025-12-17redhat
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
redhatmta/mta-cli-rhel9:7.0.0-442024-01-30redhat
redhatalbo/aws-load-balancer-rhel8-operator:1.1.1-12024-01-30redhat
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
redhatcontainer-native-virtualization/virt-artifacts-server-rhel9:v4.14.1-42023-12-07redhat
redhatopenshift-pipelines-client-0:1.10.6-11031.el82023-12-07redhat
redhatopenshift-pipelines/pipelines-workingdirinit-rhel8:v1.10.6-102023-12-07redhat
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
redhateap7-wildfly-transaction-client-0:1.1.16-1.Final_redhat_00001.1.el8eap2023-12-04redhat
redhatpatch2023-12-04redhat
redhatibm-bamoe-tech-preview/bamoe-kogito-runtime-native-rhel8:8.0.4-32023-11-29redhat

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 82× in last 7d / 365× 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 495 total refreshes for this CVE.

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

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 high 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 June 17, 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 base score of 7.5 (NVD). 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

Explore →

Is Your Infrastructure Affected by CVE-2023-44487?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs