CVE-2023-5379: Red Hat JBoss Enterprise Application Platform

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

A flaw was found in Undertow. When an AJP request is sent that exceeds the max-header-size attribute in ajp-listener, JBoss EAP is marked in an error state by mod_cluster in httpd, causing JBoss EAP to close the TCP connection without returning an AJP response. This happens because mod_proxy_cluster marks the JBoss EAP instance as an error worker when the TCP connection is closed from the backend after sending the AJP request without receiving an AJP response, and stops forwarding. This issue could allow a malicious user could to repeatedly send requests that exceed the max-header-size, causing a Denial of Service (DoS).

Affected products

• Red Hat JBoss Enterprise Application Platform: affected versions not specified; version 7.0.0 only
• Red Hat Single Sign-On: version 7.0 only
• Red Hat Undertow: affected versions not specified

Published 2023-12-12. Last modified 2026-08-04.