PT-2023-32078 · Red Hat+1 · Mod Cluster+4

Patrick Del Bello · Published 2023-12-12 · Updated 2025-10-25 · CVE-2023-5379

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions JBoss EAP (affected versions not specified)

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 to repeatedly send requests that exceed the max-header-size, causing a Denial of Service (DoS).

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2023-5379

OESA-2024-2353

RHSA-2025:9582

RHSA-2025:9583

Affected Products

Jboss Eap

Undertow

Httpd

Mod Cluster

Mod Proxy Cluster

References · 20

• https://access.redhat.com/errata/RHSA-2025:9583 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-5379 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2025:9582 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2023-5379 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-5379 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2023:4509 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2024-2353 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-5379 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-3690 · Security Note
• https://access.redhat.com/security/cve/CVE-2023-5379 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-5379 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-5379 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-5379 · Vendor Advisory
• https://openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-2353 · Note
• https://twitter.com/CVEnew/status/1734698359745597642 · Twitter Post