Netty prior 4.1.124.Final/4.2.4.Final HTTP/2 allocation of resources

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.57

Summaryinfo

A vulnerability described as problematic has been identified in Netty. Impacted is an unknown function of the component HTTP2 Handler. Such manipulation leads to allocation of resources. This vulnerability is referenced as CVE-2025-55163. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Netty. It has been rated as problematic. Affected by this issue is an unknown code block of the component HTTP2 Handler. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2025-55163 since 08/07/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 258141 (SUSE SLES15 Security Update : netty (SUSE-SU-2025:03021-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.1.124.Final or 4.2.4.Final eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (258141), EUVD (EUVD-2025-28583) and CERT Bund (WID-SEC-2025-1830). Once again VulDB remains the best source for vulnerability data.

Affected

  • Apache Tomcat
  • Debian Linux
  • Amazon Linux 2
  • IBM Power Hardware Management Console
  • Red Hat Enterprise Linux
  • Fedora Linux
  • Open Source lighttpd
  • SUSE Linux
  • Red Hat JBoss Enterprise Application Platform
  • Oracle Linux
  • IBM Operational Decision Manager
  • NetApp ActiveIQ Unified Manager
  • IBM Security Guardium
  • IBM QRadar SIEM
  • SUSE openSUSE
  • Specification http/2
  • RESF Rocky Linux
  • Xerox FreeFlow Print Server
  • Red Hat Integration
  • IBM InfoSphere Information Server
  • ATOSS Staff Efficiency Suite
  • Open Source Varnish HTTP Cache
  • Red Hat JBoss Web Server
  • Eclipse Jetty
  • Open Source Camunda
  • RealObjects PDFreactor
  • IBM Integration Bus
  • HCL Commerce
  • Atlassian Bamboo
  • Atlassian Jira
  • IBM Storage Scale
  • Dell Secure Connect Gateway
  • Atlassian Bitbucket
  • Dell NetWorker

Productinfo

Name

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 258141
Nessus Name: SUSE SLES15 Security Update : netty (SUSE-SU-2025:03021-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Netty 4.1.124.Final/4.2.4.Final

Timelineinfo

08/07/2025 CVE reserved
08/13/2025 +6 days Advisory disclosed
08/13/2025 +0 days VulDB entry created
01/21/2026 +161 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-prj3-ccx8-p6x4
Status: Confirmed

CVE: CVE-2025-55163 (🔒)
GCVE (CVE): GCVE-0-2025-55163
GCVE (VulDB): GCVE-100-319940
EUVD: 🔒
CERT Bund: WID-SEC-2025-1830 - http/2 Implementierungen: Schwachstelle ermöglicht Denial of Service

Entryinfo

Created: 08/13/2025 17:52
Updated: 01/21/2026 09:46
Changes: 08/13/2025 17:52 (65), 08/21/2025 14:52 (7), 08/30/2025 11:19 (2), 09/07/2025 22:54 (1), 09/10/2025 18:47 (12), 09/14/2025 07:20 (1), 09/30/2025 19:04 (1), 10/12/2025 23:21 (1), 12/04/2025 14:56 (1), 01/21/2026 09:46 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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