CVE-2025-55163

Netty MadeYouReset HTTP/2 DDoS Vulnerability

Published: Aug 13, 2025Updated: Nov 4, 2025 Sources: CVE List NVD GHSA BDUCWE-770

7.5HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:HAvailability

High

Open in CVSS calculator →

Weaknesses

CWE-770

Affected Products

Maven

package-ecosystem

io.netty:netty-codec-http2

OSS Libraries

io.grpc:grpc-netty-shaded

OSS Libraries

netty

oss-projectaka netty-incubator-codec-ohttp, io.netty:netty

nettyLibraryLibrary

OSS Libraries / generic-library

ООО «Ред Софт»

commercial·RUaka red soft

РЕД ОСOn-premOS

Operating Systems / linux-distro

Apache Software Foundation

oss-project·USaka apache foundation

nettyOn-premLibrary

OSS Libraries / generic-library

Google Inc

commercial·USaka google

Android StudioOn-premDesktop App

Mobile Apps

Exploitability

Official Patch Available

Is your org exposed to CVE-2025-55163?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique

Impact

View detailed technique mapping

References

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

github.com

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

openwall.com

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

kb.cert.org

and 6 more references View all →

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2025-55163 and every CVE in our database. Create a free account — no credit card required.

Create Free Account

Plain-language analysis

Impact assessment and exploitation scenario in plain English

Attack graph visualization

Interactive attack path and kill chain mapping

Exploit details & PoC links

ExploitDB, Metasploit, GitHub PoCs with direct links

Nuclei scanner templates

Ready-to-use vulnerability scanner templates

Full remediation guide

Patch instructions, workarounds, and compliance impact

Interactive AI chat

Ask questions about this vulnerability in natural language

Related vulnerabilities

Semantically similar CVEs and attack patterns

REST API & MCP access

Integrate vulnerability data into your workflows