Description
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
redhat: jboss enterprise application platform; redhat: single sign-on; redhat: undertow
References7
- access.redhat.com/security/cve/CVE-2023-5379 Vendor Advisory
- access.redhat.com/errata/RHSA-2023:4509 Vendor Advisory
- access.redhat.com/security/cve/CVE-2023-5379 Vendor Advisory
- access.redhat.com/errata/RHSA-2025:9582
- access.redhat.com/errata/RHSA-2025:9583
- bugzilla.redhat.com/show_bug.cgi?id=2242099 Issue Tracking
- bugzilla.redhat.com/show_bug.cgi?id=2242099 Issue Tracking
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 1% percentile: 64 · as of 5 November 2026
- CWE
- CWE-770
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