CVE-2024-1635Undertow: out-of-memory error after several closed connections with wildfly-http-client protocol

Description

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.

Timeline

Scores

EPSS (exploitation in 30 days)

4.6% · top 8.2% of all CVEs (13 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Affected products

• undertow

  • affected 1.31.0

• Red Hat · Red Hat build of Apache Camel 4.4.1 for Spring Boot 3.2

  All versions: unaffected

• Red Hat · Red Hat Fuse 7.13.0

  All versions: unaffected

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7

  • unaffected 0:1.5.5.016-1.redhat_00001.1.ep7.el7 – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7

  • unaffected 1:1.5.5.016-1.redhat_00001.1.ep7.el7 – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7

  • unaffected 0:3.5.11-1.Final_redhat_00001.1.ep7.el7 – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7

  • unaffected 0:1.14.2-1.redhat_00002.1.ep7.el7 – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7

  • unaffected 0:1.4.18-14.SP13_redhat_00001.1.ep7.el7 – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7

  • unaffected 0:7.1.10-2.GA_redhat_00002.1.ep7.el7 – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7

  • unaffected 0:5.0.3-2.redhat_00002.1.ep7.el7 – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7

  • unaffected 0:2.0.10-2.redhat_00002.1.ep7.el7 – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7

  • unaffected 0:2.10.4-3.redhat_00006.1.el7eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7

  • unaffected 0:2.10.4-3.redhat_00006.1.el7eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7

  • unaffected 0:2.10.4-5.redhat_00006.1.el7eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7

  • unaffected 0:2.10.4-3.redhat_00006.1.el7eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7

  • unaffected 0:2.10.4-5.redhat_00006.1.el7eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7

  • unaffected 0:2.10.4-2.redhat_00006.1.el7eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7

  • unaffected 0:1.7.2-16.Final_redhat_00017.1.el7eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7

  • unaffected 0:4.1.63-5.Final_redhat_00003.1.el7eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7

  • unaffected 0:2.0.41-4.SP5_redhat_00001.1.el7eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7

  • unaffected 0:7.3.14-3.GA_redhat_00002.1.el7eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7

  • unaffected 0:1.10.17-1.Final_redhat_00001.1.el7eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.4.16

  • unaffected 2.2.30.SP1-redhat-00001 – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 8

  • unaffected 0:2.2.30-1.SP1_redhat_00001.1.el8eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.4 for RHEL 9

  • unaffected 0:2.2.30-1.SP1_redhat_00001.1.el9eap – < *

• Red Hat · Red Hat JBoss Enterprise Application Platform 7.4 on RHEL 7

  • unaffected 0:2.2.30-1.SP1_redhat_00001.1.el7eap – < *

• Red Hat · Red Hat Single Sign-On 7.6 for RHEL 7

  • unaffected 0:18.0.13-1.redhat_00001.1.el7sso – < *

• Red Hat · Red Hat Single Sign-On 7.6 for RHEL 8

  • unaffected 0:18.0.13-1.redhat_00001.1.el8sso – < *

• Red Hat · Red Hat Single Sign-On 7.6 for RHEL 9

  • unaffected 0:18.0.13-1.redhat_00001.1.el9sso – < *

• Red Hat · RHEL-8 based Middleware Containers

  • unaffected 7.6-46 – < *

• Red Hat · RHSSO 7.6.8

  All versions: unaffected

• Red Hat · OpenShift Serverless

  All versions: unaffected

• Red Hat · Red Hat build of Apache Camel 4 for Quarkus 3

  All versions: unaffected

• Red Hat · Red Hat build of Apache Camel for Spring Boot 3

  All versions: unaffected

• Red Hat · Red Hat build of Apache Camel for Spring Boot 4

  All versions: affected

• Red Hat · Red Hat build of Apicurio Registry 2

  All versions: unaffected

• Red Hat · Red Hat Build of Keycloak

  All versions: unaffected

• Red Hat · Red Hat build of OptaPlanner 8

  All versions: unaffected

• Red Hat · Red Hat build of Quarkus

  All versions: unaffected

• Red Hat · Red Hat build of Quarkus

  All versions: unaffected

• Red Hat · Red Hat Data Grid 8

  All versions: unaffected

• Red Hat · Red Hat Integration Camel K 1

  All versions: unaffected

• Red Hat · Red Hat Integration Camel Quarkus 2

  All versions: unaffected

• Red Hat · Red Hat JBoss Data Grid 7

  All versions: unknown

• Red Hat · Red Hat JBoss Enterprise Application Platform 8

  All versions: unaffected

• Red Hat · Red Hat JBoss Fuse Service Works 6

  All versions: unknown

• Red Hat · Red Hat Process Automation 7

  All versions: affected

• Red Hat · streams for Apache Kafka

  All versions: unaffected

Affected packages

From reviewed advisories of the GitHub Advisory Database.

• Mavenio.undertow:undertow-coreGHSA-w6qf-42m7-vh68 (opens in a new tab)

What to do

Workaround: No mitigation is currently available for this vulnerability. However, there might be some protections, such as request limits by a load balancer in front of JBoss EAP/Wildfly or even Undertow, that could minimize the impact.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2024-0747 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisory GHSA-w6qf-42m7-vh68 (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2024-1635](https://cveledger.app/badge/CVE-2024-1635.svg)](https://cveledger.app/cve/CVE-2024-1635)

Record last updated 4 Nov 2026, 21:08 UTC.