CVE-2025-55163
August 13, 2025
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.
Affected Packages
https://github.com/netty/netty.git (GITHUB):
Affected version(s) >=netty-4.2.0.Final <4.2.4.FinalFix Suggestion:
Update to version 4.2.4.Finalhttps://github.com/netty/netty.git (GITHUB):
Affected version(s) >=netty-3.2.4.Final <netty-4.1.124.FinalFix Suggestion:
Update to version netty-4.1.124.Finalio.grpc:grpc-netty-shaded (JAVA):
Affected version(s) >=1.9.0 <1.75.0Fix Suggestion:
Update to version 1.75.0io.netty:netty-codec-http2 (JAVA):
Affected version(s) >=4.1.0.Beta4 <4.1.124.FinalFix Suggestion:
Update to version 4.1.124.Finalio.netty:netty-codec-http2 (JAVA):
Affected version(s) >=4.2.0.Alpha1 <4.2.4.FinalFix Suggestion:
Update to version 4.2.4.Finalio.netty:netty-codec-http2 (JAVA):
Affected version(s) >=4.1.0.Beta4 <4.1.124.FinalFix Suggestion:
Update to version 4.1.124.Finalio.netty:netty-codec-http2 (JAVA):
Affected version(s) >=4.2.0.Final <4.2.4.FinalFix Suggestion:
Update to version 4.2.4.FinalRelated Resources (8)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
EPSS
Base Score:
0.1
