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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
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).
Metrics
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vector strings. CVSS information contributed by other sources is also
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CVE Modified by Red Hat, Inc.10/24/2025 9:15:42 PM
CVE Modified by Red Hat, Inc.5/14/2024 10:26:46 AM
Action
Type
Old Value
New Value
Initial Analysis by NIST12/20/2023 1:39:19 PM
Action
Type
Old Value
New Value
Added
CVSS V3.1
NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Added
CWE
NIST CWE-770
Added
CPE Configuration
OR
*cpe:2.3:a:redhat:jboss_enterprise_application_platform:-:*:*:*:text-only:*:*:*
*cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:*
*cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*
*cpe:2.3:a:redhat:undertow:-:*:*:*:*:*:*:*
Changed
Reference Type
https://access.redhat.com/errata/RHSA-2023:4509 No Types Assigned
CVE Modified by Red Hat, Inc.12/12/2023 11:15:06 PM
Action
Type
Old Value
New Value
Added
Reference
Red Hat, Inc. https://access.redhat.com/errata/RHSA-2023:4509 [No types assigned]
New CVE Received from Red Hat, Inc.12/12/2023 5:15:22 PM
Action
Type
Old Value
New Value
Added
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).
Added
CVSS V3.1
Red Hat, Inc. AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Added
CWE
Red Hat, Inc. CWE-770
Added
Reference
Red Hat, Inc. https://access.redhat.com/security/cve/CVE-2023-5379 [No types assigned]
Added
Reference
Red Hat, Inc. https://bugzilla.redhat.com/show_bug.cgi?id=2242099 [No types assigned]
Quick Info
CVE Dictionary Entry: CVE-2023-5379 NVD
Published Date: 12/12/2023 NVD
Last Modified: 06/17/2026
Source: Red Hat, Inc.
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