CVE-2025-55163

Netty MadeYouReset HTTP/2 DDoS Vulnerability

Published Aug 13, 2025 CVSS 4.0 · 8.2 High EPSS 1.1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4519-1 netty security update
Debian DSA Debian DSA DSA-6160-1 netty security update
EUVD EUVD EUVD-2025-28583 Netty affected by MadeYouReset HTTP/2 DDoS vulnerability
Github GHSA Github GHSA GHSA-prj3-ccx8-p6x4 Netty affected by MadeYouReset HTTP/2 DDoS vulnerability
Ubuntu USN Ubuntu USN USN-8654-1 Netty vulnerabilities
History
Type Values Removed Values Added
CPEs cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Important

Type Values Removed Values Added
First Time appeared Netty
Netty netty
Vendors & Products Netty
Netty netty
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Netty MadeYouReset HTTP/2 DDoS Vulnerability
Weaknesses CWE-770
References
Metrics cvssV4_0

{'score': 8.2, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Nov 4, 2025, 9:13 PM
Reserved
Aug 7, 2025, 6:27 PM
Status
Modified
Published
Aug 13, 2025, 3:15 PM
Modified
Jun 17, 2026, 9:41 AM
Severity
Important
Public date
Aug 13, 2025, 2:17 PM