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`CVE-2025-55163` Netty

Affected software	Netty
Severity	8.2 High CVSS 4.0 2 scores
Fixed in	`4.2.4.Final`, `4.1.124.Final`
Weakness	CWE-770
Published	13 Aug 2025
Updated	17 Jun 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. The 1 repository below are public GitHub repositories with fewer than 5 stars.

CISA KEV not listed
VulnCheck KEV not listed
CISA Vulnrichment exploitation: none
Indexed PoC 1 indexed, none at 5+ stars
EPSS 1.1% chance in 30 days

1 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

Index

Artifact

Stars

First seen

GitHub PoC

CVE-2025-55163 / CVE-2026-56819: offline checker for the 7 netty-codec-http2 CVEs. Tells you which ones you are exposed to, and the one version that fixes all seven (4.1.136.Final / 4.2.16.Final) - written on none of the advisories. Does not scan pom.xml on purpose: WebFlux pulls it in transitively.

2026-09-05

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

Protection none
Action not pursued none
Review human Researcher
Record active

Decided by

Manual classification of this CVE in the legacy dataset

Finding

A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

8.2 HIGH v4.0

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

2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

Version Score Band Vector Assigner Type

CVSS 4.0 8.2 HIGH 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 security-advisories@github.com Secondary published

CVSS 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H NVD Primary

Affected software and releases

Oracle advisories

Advisory

Type

Quarter

Products Oracle names in its risk matrix

Oracle Critical Patch Update April 2026 ↗

CPU

2026-Q2

Oracle Communications / Configuration (Netty) (25.1.200, 25.2.200)
Oracle Communications / Signaling (Netty) (25.1.201)
Oracle Communications / Signaling (Netty) (25.1.204)
Oracle Financial Services Applications / Configuration (Netty) (14.6.0.0.0-14.8.0.0.0)
Oracle Financial Services Applications / Core (Netty) (14.5.0.0.0-14.8.0.0.0)
Oracle Financial Services Applications / Dashboard (Netty) (14.5.0.0.0-14.8.0.0.0)
Oracle Financial Services Applications / Payments (Netty) (14.5.0.0.0-14.8.0.0.0)

Oracle Critical Patch Update January 2026 ↗

CPU

2026-Q1

Oracle Communications / Core (Netty) (6.1.0-6.1.1)
Oracle Communications / Security (Netty) (24.2.0-24.2.1, 24.3.0, 25.1.100, 25.1.200, 25.2.100)
Oracle Financial Services Applications / Accessibility (Netty) (14.5.0.15.0, 14.6.0.11.0, 14.7.0.9.0, 14.8.0.1.0, 14.8.1.0.0)
Oracle Financial Services Applications / Common Core (Netty) (14.5.0.15.0, 14.6.0.11.0, 14.7.0.9.0, 14.8.0.1.0, 14.8.1.0.0)
Oracle Financial Services Applications / Security (Netty) (14.5.0.15.0, 14.6.0.11.0, 14.7.0.9.0, 14.8.0.1.0, 14.8.1.0.0)
Oracle Fusion Middleware / Messaging Enabler (Netty) (14.1.2.0.0)
Oracle Fusion Middleware / Runtime Java agent (Netty) (12.2.1.4.0)
Oracle PeopleSoft / OpenSearch (Netty) (8.60, 8.61, 8.62)
Oracle Utilities Applications / Core (Netty) (2.5.0.2.10, 2.6.0.1.9, 2.6.0.2.5)

Oracle Critical Patch Update October 2025 ↗

CPU

2025-Q4

Oracle Commerce / Tools And Frameworks (Netty) (11.4.0)
Oracle Communications / Alarms, KPI, and Measurements (Netty) (24.2.7-25.1.200)
Oracle Communications / Install (Netty) (24.2.7-25.1.200)
Oracle Communications / Install (Netty) (25.1.200)
Oracle Communications / Signaling (Netty) (25.1.200)
Oracle Communications Applications / Installation (Netty) (15.0.0.0.0-15.0.1.0.0)
Oracle Communications Applications / Installation (Netty) (2.0.0.0.0, 2.0.0.1.0)
Oracle Communications Applications / REST (Netty) (12.0.6.0.0, 15.0.0.0.0-15.0.1.0.0)
Oracle Communications Applications / REST Services Manager (Netty) (12.0.0.4.0-12.0.0.8.0, 15.0.0.0.0-15.0.1.0.0)
Oracle Communications Applications / Security (Netty) (12.0.0.4.0-15.0.1.0.0)
Oracle Communications Applications / Security (Netty) (7.5.0)
Oracle Communications Applications / Security (Netty) (7.7.0-7.8.0)
Oracle Communications Applications / Solution Designer (Netty) (8.0.0.5.0, 8.1.0.4.0)
Oracle Financial Services Applications / Reports (Netty) (14.5.0.0.0-14.8.0.0.0)
Oracle Fusion Middleware / Third Party (Netty) (12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0)
Oracle Hospitality Applications / Next-Gen SPMS (Netty) (23.2.5)
Oracle Retail Applications / Xenvironment (Netty) (22.0.2, 23.0.2, 24.0.1)

Oracle components and versions

Family

Component

Versions, as Oracle lists them

Read as

Oracle Commerce

Tools And Frameworks (Netty)

11.4.0

11.4.0

Oracle Communications

Alarms, KPI, and Measurements (Netty)

24.2.7-25.1.200

Oracle Communications

Configuration (Netty)

25.1.200, 25.2.200

25.1.200 · 25.2.200

Oracle Communications

Core (Netty)

6.1.0-6.1.1

Oracle Communications

Install (Netty)

24.2.7-25.1.200

25.1.200

Oracle Communications

Security (Netty)

24.2.0-24.2.1, 24.3.0, 25.1.100, 25.1.200, 25.2.100

24.3.0 · 25.1.100 · 25.1.200 · 25.2.100

Oracle Communications

Signaling (Netty)

25.1.200

25.1.200 · 25.1.201 · 25.1.204

Oracle Communications Applications

Installation (Netty)

15.0.0.0.0-15.0.1.0.0

2.0.0.0.0 · 2.0.0.1.0

Oracle Communications Applications

REST (Netty)

12.0.6.0.0, 15.0.0.0.0-15.0.1.0.0

12.0.6.0.0

Oracle Communications Applications

REST Services Manager (Netty)

12.0.0.4.0-12.0.0.8.0, 15.0.0.0.0-15.0.1.0.0

Oracle Communications Applications

Security (Netty)

7.7.0-7.8.0

7.5.0

Oracle Communications Applications

Solution Designer (Netty)

8.0.0.5.0, 8.1.0.4.0

8.0.0.5.0 · 8.1.0.4.0

Oracle Financial Services Applications

Accessibility (Netty)

14.5.0.15.0, 14.6.0.11.0, 14.7.0.9.0, 14.8.0.1.0, 14.8.1.0.0

14.5.0.15.0 · 14.6.0.11.0 · 14.7.0.9.0 · 14.8.0.1.0 · 14.8.1.0.0

Oracle Financial Services Applications

Common Core (Netty)

14.5.0.15.0, 14.6.0.11.0, 14.7.0.9.0, 14.8.0.1.0, 14.8.1.0.0

14.5.0.15.0 · 14.6.0.11.0 · 14.7.0.9.0 · 14.8.0.1.0 · 14.8.1.0.0

Oracle Financial Services Applications

Configuration (Netty)

14.6.0.0.0-14.8.0.0.0

Oracle Financial Services Applications

Core (Netty)

14.5.0.0.0-14.8.0.0.0

Oracle Financial Services Applications

Dashboard (Netty)

14.5.0.0.0-14.8.0.0.0

Oracle Financial Services Applications

Payments (Netty)

14.5.0.0.0-14.8.0.0.0

Oracle Financial Services Applications

Reports (Netty)

14.5.0.0.0-14.8.0.0.0

Oracle Financial Services Applications

Security (Netty)

14.5.0.15.0, 14.6.0.11.0, 14.7.0.9.0, 14.8.0.1.0, 14.8.1.0.0

14.5.0.15.0 · 14.6.0.11.0 · 14.7.0.9.0 · 14.8.0.1.0 · 14.8.1.0.0

Oracle Fusion Middleware

Messaging Enabler (Netty)

14.1.2.0.0

14.1.2.0.0

Oracle Fusion Middleware

Runtime Java agent (Netty)

12.2.1.4.0

12.2.1.4.0

Oracle Fusion Middleware

Third Party (Netty)

12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0

12.2.1.4.0 · 14.1.1.0.0 · 14.1.2.0.0

Oracle Hospitality Applications

Next-Gen SPMS (Netty)

23.2.5

23.2.5

Oracle PeopleSoft

OpenSearch (Netty)

8.60, 8.61, 8.62

8.60 · 8.61 · 8.62

Oracle Retail Applications

Xenvironment (Netty)

22.0.2, 23.0.2, 24.0.1

22.0.2 · 23.0.2 · 24.0.1

Oracle Utilities Applications

Core (Netty)

2.5.0.2.10, 2.6.0.1.9, 2.6.0.2.5

2.5.0.2.10 · 2.6.0.1.9 · 2.6.0.2.5

Maven packages

Affected and fixed versions, from OSV.dev

Package Introduced Fixed Last affected

io.netty:netty-codec-http2 4.2.0.Alpha1 4.2.4.Final unbounded

io.netty:netty-codec-http2 0 4.1.124.Final unbounded

io.grpc:grpc-netty-shaded 0 1.75.0 unbounded

Products and versions

3 products, 5 version entries

Source

Vendor

Product

Scheme

Affected versions

osv

io.grpc

grpc-netty-shaded

generic

＜ 1.75.0

osv

io.netty

netty-codec-http2

generic

＜ 4.1.124 · ≥ 4.2.0 and ＜ 4.2.4

nvd

netty

generic

＜ 4.1.124 · ≥ 4.2.0 and ＜ 4.2.4

References

URL

Tags

https://github.com/netty/netty/security/advisories/GHSA-prj3-ccx8-p6x4

WEB

https://github.com/grpc/grpc-java/commit/6462ef9a11980e168c21d90bbc7245c728fd1a7a

WEB

https://github.com/netty/netty/commit/be53dc3c9acd9af2e20d0c3c07cd77115a594cf1

WEB

https://github.com/netty/netty

PACKAGE

https://www.kb.cert.org/vuls/id/767506

WEB

http://www.openwall.com/lists/oss-security/2025/08/16/1

WEB

Timeline

Published

2025-08-13

By the CVE Program.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

How VRT decided (5 of 24 rules ran)

5 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file no match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no match An ARMR security-rule template on disk for this CVE

4 manual-classification no match A researcher's recorded decision for this specific CVE

5 manual classification decided it matched Outside Waratek scope Found in legacy manual classifications

6 non-java-upstream not reached A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component not reached The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side not reached Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven not reached An OSV.dev record of this CVE affecting a package published to Maven Central. When every such package is one business applications do not use (Minecraft mods and launchers, Fastjson) and no tracked product is named by CPE, it settles the CVE as Outside Waratek scope instead

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint not reached A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven not reached The affected package being open source on Maven, so the fix can be read

19 poc-derivable not reached An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit not reached Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match not reached A vulnerability class already blocked by an ARMR security rule

22 exploited-no-fix-or-poc not reached Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold not reached Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory

24 no-exploit-published not reached Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all

NVD ↗ · CVE.org ↗