Undertow: ajp request closes connection exceeding maxrequestsize

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2023-5379
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-12-12 22:15:22 UTC
Updated2026-08-04 22:17:08 UTC
DescriptionA 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).

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.010160000 probability, percentile 0.600430000 (date 2026-08-09)

Problem Types: CWE-770 | CWE-770 Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Redhat Jboss Enterprise Application Platform - All All All
Application Redhat Jboss Enterprise Application Platform 7.0.0 All All All
Application Redhat Single Sign-on 7.0 All All All
Application Redhat Undertow - All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS For RHEL 7 unaffected 0:3.0.1-4.b08_redhat_00005.1.ep7.el7 * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS For RHEL 7 unaffected 0:5.1.17-3.Final_redhat_00004.1.ep7.el7 * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS For RHEL 7 unaffected 0:2.8.11.6-3.SP1_redhat_00003.1.ep7.el7 * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS For RHEL 7 unaffected 0:4.0.12-1.Final_redhat_00002.1.ep7.el7 * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS For RHEL 7 unaffected 0:4.1.63-2.Final_redhat_00003.1.ep7.el7 * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS For RHEL 7 unaffected 0:1.4.18-16.SP14_redhat_00001.1.ep7.el7 * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS For RHEL 7 unaffected 0:7.1.11-4.GA_redhat_00002.1.ep7.el7 * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS For RHEL 7 unaffected 0:1.1.14-1.Final_redhat_00001.1.ep7.el7 * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS For RHEL 7 unaffected 0:1.0.21-1.Final_redhat_00001.1.ep7.el7 * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS For RHEL 7 unaffected 0:1.0.13-1.Final_redhat_00001.1.ep7.el7 * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS For RHEL 7 unaffected 0:1.0.12-1.Final_redhat_00001.1.ep7.el7 * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS For RHEL 7 unaffected 0:1.0.12-6.Final_redhat_00001.1.ep7.el7 * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS For RHEL 7 unaffected 0:2.10.4-3.redhat_00006.1.el7eap * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS For RHEL 7 unaffected 0:2.10.4-3.redhat_00006.1.el7eap * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS For RHEL 7 unaffected 0:2.10.4-5.redhat_00006.1.el7eap * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS For RHEL 7 unaffected 0:2.10.4-3.redhat_00006.1.el7eap * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS For RHEL 7 unaffected 0:2.10.4-5.redhat_00006.1.el7eap * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS For RHEL 7 unaffected 0:2.10.4-2.redhat_00006.1.el7eap * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS For RHEL 7 unaffected 0:1.7.2-16.Final_redhat_00017.1.el7eap * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS For RHEL 7 unaffected 0:4.1.63-5.Final_redhat_00003.1.el7eap * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS For RHEL 7 unaffected 0:2.0.41-4.SP5_redhat_00001.1.el7eap * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS For RHEL 7 unaffected 0:7.3.14-3.GA_redhat_00002.1.el7eap * rpm Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS For RHEL 7 unaffected 0:1.10.17-1.Final_redhat_00001.1.el7eap * rpm Not specified
CNA Red Hat Red Hat Build Of Quarkus Not specified Not specified
CNA Red Hat Red Hat Data Grid 8 Not specified Not specified
CNA Red Hat Red Hat Decision Manager 7 Not specified Not specified
CNA Red Hat Red Hat Fuse 7 Not specified Not specified
CNA Red Hat Red Hat JBoss Data Grid 7 Not specified Not specified
CNA Red Hat Red Hat JBoss Enterprise Application Platform 7 Not specified Not specified
CNA Red Hat Red Hat JBoss Fuse 6 Not specified Not specified
CNA Red Hat Red Hat Process Automation 7 Not specified Not specified
CNA Red Hat Red Hat Single Sign-On 7 Not specified Not specified
CNA Red Hat Red Hat Support For Spring Boot Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2025:9583 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking
access.redhat.com/security/cve/CVE-2023-5379 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Vendor Advisory
access.redhat.com/errata/RHSA-2023:4509 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Vendor Advisory
access.redhat.com/errata/RHSA-2025:9582 [email protected] access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2023-10-04T00:00:00.000ZReported to Red Hat.
CNA2023-12-12T00:00:00.000ZMade public.

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report