CVE-2024-1635: Undertow core Remote Code Execution Vulnerability

Q: What is CVE-2024-1635?

CVE-2024-1635 is a security vulnerability in Undertow core involving Undertow Uncontrolled Resource Consumption Vulnerability under CWE-400: Uncontrolled Resource Consumption.

Q: Which Undertow core versions are affected?

Affected versions include releases prior to 2.3.12.Final, 2.2.31.Final across affected packages: io.undertow:undertow-core.

Q: What version fixes CVE-2024-1635?

Upgrading to 2.3.12.Final, 2.2.31.Final (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is undertow-core affected?

Yes, io.undertow:undertow-core is affected in releases prior to 2.3.12.Final, 2.2.31.Final. Upgrade your dependency to 2.3.12.Final, 2.2.31.Final or later.

Q: What is the CVSS score of CVE-2024-1635?

CVE-2024-1635 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Q: What CWE is associated with CVE-2024-1635?

CVE-2024-1635 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).

Q: How can I check Maven dependencies for CVE-2024-1635?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.undertow'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

HIGH

Advisory Identifier: GHSA-w6qf-42m7-vh68

CVSS 7.5

CWE-400

Published 2024-02-20

Advisory Summary

CVE-2024-1635 is a HIGH (CVSS 7.5) remote code execution vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Undertow core libraries in the Maven ecosystem. The issue involves undertow uncontrolled resource consumption vulnerability. Remediation is available by upgrading affected packages to version 2.3.12.Final, 2.2.31.Final.

CVE-2024-1635 at a Glance

CVE Identifier CVE-2024-1635

GHSA Identifier GHSA-w6qf-42m7-vh68

Severity HIGH

CVSS v3.1 Base Score 7.5

CWE Classification CWE-400: Uncontrolled Resource Consumption

Affected Product Undertow core

Package Ecosystem Maven

Published Date 2024-02-20

Last Updated 2025-04-28

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required None (PR:N)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality None (C:N)

Integrity None (I:N)

Availability High (A:H)

How to Fix CVE-2024-1635

To remediate this vulnerability, upgrade all affected Undertow core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

io.undertow:undertow-core fixed: 2.3.12.Final

<dependency>
    <groupId>io.undertow</groupId>
    <artifactId>undertow-core</artifactId>
    <version>2.3.12.Final</version>
</dependency>

io.undertow:undertow-core fixed: 2.2.31.Final

<dependency>
    <groupId>io.undertow</groupId>
    <artifactId>undertow-core</artifactId>
    <version>2.2.31.Final</version>
</dependency>

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

mvn dependency:tree -Dincludes=io.undertow

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2024-1635, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=io.undertow

Analyze the terminal output to locate any version of Undertow core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.3.12.Final), your application is affected.

Note: The mvn dependency:tree -Dincludes=io.undertow command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Undertow core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A vulnerability was found in Undertow. This vulnerability impacts a server that supports the wildfly-http-client protocol. Whenever a malicious user opens and closes a connection with the HTTP port of the server and then closes the connection immediately, the server will end with both memory and open file limits exhausted at some point, depending on the amount of memory available. At HTTP upgrade to remoting, the WriteTimeoutStreamSinkConduit leaks connections if RemotingConnection is closed by Remoting ServerConnectionOpenListener. Because the remoting connection originates in Undertow as part of the HTTP upgrade, there is an external layer to the remoting connection. This connection is unaware of the outermost layer when closing the connection during the connection opening procedure. Hence, the Undertow WriteTimeoutStreamSinkConduit is not notified of the closed connection in this scenario. Because WriteTimeoutStreamSinkConduit creates a timeout task, the whole dependency tree leaks via that task, which is added to XNIO WorkerThread. So, the workerThread points to the Undertow conduit, which contains the connections and causes the leak.

CVE-2024-1635 Affected Undertow core Versions

2 component(s)

Fixed Versions:

2.3.12.Final2.2.31.Final

Product / Package	Ecosystem	Affected Versions	Fixed Version
io.undertow:undertow-core maven/io.undertow/undertow-core	Maven	≥ 2.3.0.Final < 2.3.12.Final	2.3.12.Final
io.undertow:undertow-core maven/io.undertow/undertow-core	Maven	< 2.2.31.Final	2.2.31.Final

References

NVD — CVE-2024-1635 NVD

https://nvd.nist.gov/vuln/detail/CVE-2024-1635

Security Fix Commit FIX COMMIT

https://github.com/undertow-io/undertow/commit/7d388c5aae9b82afb63f24e3b6a2044838dfb4de

Security Fix Commit FIX COMMIT

https://github.com/undertow-io/undertow/commit/3cdb104e225f34547ce9fd6eb8799eb68e040f19

Undertow core Security Information SECURITY

https://security.netapp.com/advisory/ntap-20240322-0007

Undertow core Source Repository REPOSITORY

https://github.com/undertow-io/undertow

bugzilla.redhat.com/show_bug.cgi WEB

https://bugzilla.redhat.com/show_bug.cgi?id=2264928

Undertow core Security Information SECURITY

https://access.redhat.com/security/cve/CVE-2024-1635

access.redhat.com/errata/rhsa-2025:42... WEB

https://access.redhat.com/errata/RHSA-2025:4226

access.redhat.com/errata/rhsa-2024:48... WEB

https://access.redhat.com/errata/RHSA-2024:4884

access.redhat.com/errata/rhsa-2024:33... WEB

https://access.redhat.com/errata/RHSA-2024:3354

access.redhat.com/errata/rhsa-2024:18... WEB

https://access.redhat.com/errata/RHSA-2024:1866

access.redhat.com/errata/rhsa-2024:18... WEB

https://access.redhat.com/errata/RHSA-2024:1864

access.redhat.com/errata/rhsa-2024:18... WEB

https://access.redhat.com/errata/RHSA-2024:1862

access.redhat.com/errata/rhsa-2024:18... WEB

https://access.redhat.com/errata/RHSA-2024:1861

access.redhat.com/errata/rhsa-2024:18... WEB

https://access.redhat.com/errata/RHSA-2024:1860

access.redhat.com/errata/rhsa-2024:16... WEB

https://access.redhat.com/errata/RHSA-2024:1677

access.redhat.com/errata/rhsa-2024:16... WEB

https://access.redhat.com/errata/RHSA-2024:1676

access.redhat.com/errata/rhsa-2024:16... WEB

https://access.redhat.com/errata/RHSA-2024:1675

access.redhat.com/errata/rhsa-2024:16... WEB

https://access.redhat.com/errata/RHSA-2024:1674

Frequently Asked Questions

What is CVE-2024-1635?

CVE-2024-1635 is a security vulnerability in Undertow core involving Undertow Uncontrolled Resource Consumption Vulnerability under CWE-400: Uncontrolled Resource Consumption.

Which Undertow core versions are affected?

Affected versions include releases prior to 2.3.12.Final, 2.2.31.Final across affected packages: io.undertow:undertow-core.

What version fixes CVE-2024-1635?

Upgrading to 2.3.12.Final, 2.2.31.Final (or the latest patched release for your respective branch) resolves the vulnerability.

Is undertow-core affected?

Yes, io.undertow:undertow-core is affected in releases prior to 2.3.12.Final, 2.2.31.Final. Upgrade your dependency to 2.3.12.Final, 2.2.31.Final or later.

What is the CVSS score of CVE-2024-1635?

CVE-2024-1635 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

What CWE is associated with CVE-2024-1635?

CVE-2024-1635 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).

How can I check Maven dependencies for CVE-2024-1635?

Run the dependency tree command: 'mvn dependency:tree -Dincludes=io.undertow'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

Machine-readable OSV JSON OSV v1.5 Schema

Normalized schema output

View Raw JSON

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CVSS V3

7.5 HIGH

Attack Vector Network (AV:N)

Attack Complexity Low (AC:L)

Privileges Required None (PR:N)

User Interaction None (UI:N)

Scope Unchanged (S:U)

Confidentiality None (C:N)

Integrity None (I:N)

Availability High (A:H)

Vector String

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

Advisory Metadata

Source ID: GHSA-w6qf-42m7-vh68
Schema Version: 1.4.0
Published: 2024-02-20 00:30
Last Modified: 2025-04-28 15:32
Database Record File: advisories/github-reviewed/2024/02/GHSA-w6qf-42m7-vh68/GHSA-w6qf-42m7-vh68.json