Resource exhaustion in Undertow - CVE-2025-9784

Vulnerability identifier: #VU118734

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-9784

CWE-ID: CWE-400

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when handling HTTP/2 requests. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

The vulnerability was dubbed HTTP/2 Made You Reset Attack.

Undertow
JBoss Enterprise Application Platform
Rational Performance Tester
DevOps Test Performance
eap8-jboss-el (Red Hat package)
eap8-eventstream (Red Hat package)
eap8-bouncycastle (Red Hat package)
eap8-undertow (Red Hat package)
eap8-jboss-threads (Red Hat package)
eap8-wildfly-elytron (Red Hat package)
eap8-apache-cxf (Red Hat package)
eap8-wildfly-clustering (Red Hat package)
eap8-hibernate (Red Hat package)
eap8-wildfly-javadocs (Red Hat package)
eap8-wildfly (Red Hat package)
eap8-eap-product-conf-parent (Red Hat package)
Red Hat Camel for Spring Boot

Install updates from vendor's website.

Undertow - addressed in versions 2.2.38, 2.3.20
JBoss Enterprise Application Platform - update to 8.1.3
DevOps Test Performance - update to 11.0.8
eap8-jboss-el (Red Hat package) - addressed in versions api_5.0_spec-4.0.2-1.Final_redhat_00001.1.el8eap, api_5.0_spec-4.0.2-1.Final_redhat_00001.1.el9eap
eap8-eventstream (Red Hat package) - addressed in versions 1.0.1-3.redhat_00003.1.el8eap, 1.0.1-3.redhat_00003.1.el9eap
eap8-bouncycastle (Red Hat package) - addressed in versions 1.82.0-1.redhat_00001.1.el8eap, 1.82.0-1.redhat_00001.1.el9eap
eap8-undertow (Red Hat package) - addressed in versions 2.3.20-2.SP4_redhat_00001.1.el8eap, 2.3.20-2.SP4_redhat_00001.1.el9eap
eap8-jboss-threads (Red Hat package) - addressed in versions 2.5.0-1.redhat_00001.1.el8eap, 2.5.0-1.redhat_00001.1.el9eap
eap8-wildfly-elytron (Red Hat package) - addressed in versions 2.6.6-1.Final_redhat_00001.1.el8eap, 2.6.6-1.Final_redhat_00001.1.el9eap
eap8-apache-cxf (Red Hat package) - addressed in versions 4.0.10-1.redhat_00001.1.el8eap, 4.0.10-1.redhat_00001.1.el9eap
Red Hat Camel for Spring Boot - update to 4.14.2
eap8-wildfly-clustering (Red Hat package) - addressed in versions 5.0.12-1.Final_redhat_00001.1.el8eap, 5.0.12-1.Final_redhat_00001.1.el9eap
eap8-hibernate (Red Hat package) - addressed in versions 6.6.36-1.Final_redhat_00001.1.el8eap, 6.6.36-1.Final_redhat_00001.1.el9eap
eap8-wildfly-javadocs (Red Hat package) - addressed in versions 8.1.1-4.GA_redhat_00007.1.el8eap, 8.1.1-4.GA_redhat_00007.1.el9eap
eap8-wildfly (Red Hat package) - addressed in versions 8.1.3-4.GA_redhat_00006.1.el8eap, 8.1.3-4.GA_redhat_00006.1.el9eap
eap8-eap-product-conf-parent (Red Hat package) - addressed in versions 801.3.0-1.GA_redhat_00001.1.el8eap, 801.3.0-1.GA_redhat_00001.1.el9eap

• https://bugzilla.redhat.com/show_bug.cgi?id=2392306
• https://github.com/undertow-io/undertow/pull/1778
• https://github.com/undertow-io/undertow/releases/tag/2.2.38.Final
• https://issues.redhat.com/browse/UNDERTOW-2598
• https://www.kb.cert.org/vuls/id/767506

• Multiple vulnerabilities in Undertow
• Multiple vulnerabilities in Red Hat Camel for Spring Boot 4.14
• Multiple vulnerabilities in JBoss Enterprise Application Platform 8.1 for RHEL 9 x86_64
• Multiple vulnerabilities in JBoss Enterprise Application Platform 8.1 for RHEL 8 x86_64
• Multiple vulnerabilities in Red Hat JBoss Enterprise Application Platform 8.1
• IBM DevOps Test Performance update for Undertow