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Public proof of conceptFix available

CVE-2025-55163

A public proof of concept exists; no exploitation attested.

  • Published2025-08-13
  • Fixed in4.2.4 · 4.1.124
  • WeaknessCWE-770

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.124.Final and 4.2.4.Final, Netty is vulnerable to MadeYouReset DDoS. This is a logical vulnerability in the HTTP/2 protocol, that uses malformed HTTP/2 control frames in order to break the max concurrent streams limit - which results in resource exhaustion and distributed denial of service. This issue has been patched in versions 4.1.124.Final and 4.2.4.Final.

Timeline

dates in UTC
  1. 2025-08-1315:15CVE publishedNVD

Versions per branch

NVD · OSV
Netty
BranchAffectedFixed in
4.2≥ 4.2.0, < 4.2.44.2.4
4.1< 4.1.1244.1.124
netty-codec-http2
BranchAffectedFixed in
4.2≥ 4.2.0.Alpha1, < 4.2.4.Final4.2.4.Final
4.1< 4.1.124.Final4.1.124.Final
grpc-netty-shaded
BranchAffectedFixed in
1.75< 1.75.01.75.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • netty
    Affected
    • = < 4.1.124.Finalno fix stated
    • = < 4.2.4.Finalno fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2025-08-13

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • apache-hiveCleanStartall versions · fixed in 4.0.0-r0
  • apache-hiveCleanStartall versions · fixed in 4.0.1-r11
  • apache-hiveCleanStartall versions · fixed in 4.1.0-r7
  • apache-hiveCleanStartall versions · fixed in 4.2.0-r11
  • apache-hiveCleanStartall versions · fixed in 4.2.0-r1
  • druid-fipsCleanStartall versions · fixed in 34.0.0-r4
  • druid-fipsCleanStartall versions · fixed in 36.0.0-r3
  • incubator-kie-kogito-data-index-ephemeralCleanStartall versions · fixed in 10.1.0-r1

122 more package ranges on OSV.dev

Vendor advisories

  • CVE-2025-55163 Red Hat Product Security480 products fixed · 31 known affected

    netty: netty-codec-http2: Netty MadeYouReset HTTP/2 DDoS Vulnerability

    netty-codec-http2 as a component of Logging Subsystem for Red Hat OpenShift · openshift-serverless-1/kn-ekb-dispatcher-rhel8 as a component of OpenShift Serverless · openshift-serverless-1/kn-ekb-kafka-controller-rhel8 as a component of OpenShift Serverless · +28 more

  • RHSA-2026:62260 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.30.0 Release.

  • RHSA-2026:4924 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.24 security update

  • RHSA-2026:4917 Red Hat Product Security36 products fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.24 security update

  • RHSA-2026:4915 Red Hat Product Security36 products fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.24 security update

  • RHSA-2026:4916 Red Hat Product Security37 products fixed

    Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.24 security update

18 more advisories

Full record on NVD

Fix

  1. Update Netty to 4.2.4 · 4.1.124
  2. Vendor fix Red Hat Product Security RHSA-2026:62260 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix Red Hat Product Security RHSA-2026:4924 · 1 productBefore applying the update, make sure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://acce…
  4. Vendor fix Red Hat Product Security RHSA-2026:0743 · 50 productsBefore applying this update, ensure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access…
  5. Vendor fix Red Hat Product Security RHSA-2025:23417 · 1 productBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  6. Vendor fix Red Hat Product Security RHSA-2025:19094 · 8 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  7. Vendor fix Red Hat Product Security RHSA-2025:18989 · 2 productsFor Red Hat OpenShift AI 2.25.0 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2025-08-13
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-prj3-ccx8-p6x4

Frequently asked questions

What is CVE-2025-55163?

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.124.Final and 4.2.4.Final, Netty is vulnerable to MadeYouReset DDoS. This is a logical vulnerability in the HTTP/2 protocol, that uses malformed HTTP/2 control frames in order to break the max concurrent streams limit - which results in resource exhaustion and distributed denial of service. This issue has been patched in versions 4.1.124.Final and 4.2.4.Final.

Is CVE-2025-55163 actively exploited?

Active exploitation of CVE-2025-55163 has not been confirmed. Its EPSS score was 1.1% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-55163?

CVE-2025-55163 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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