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CVE-2023-5379

Undertow: ajp request closes connection exceeding maxrequestsize

Published: Dec 12, 2023Updated: Oct 25, 2025 Sources: CVE List NVDCWE-770
NVD MITRE
7.5CVSSHIGH
EPSS Score
1.0%
Top 41.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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).

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-770

Affected Products

Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7Red Hat
On-prem
Operating Systems / linux-distro
Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7Red Hat
On-prem
Operating Systems / linux-distro
Red Hat build of QuarkusRed Hat
LibraryLibrary
OSS Libraries / generic-library
Red Hat Data Grid 8Red Hat
On-premDatabase
Databases / cache-message-queue
Red Hat Decision Manager 7Red Hat
On-prem
Operating Systems / linux-distro
red hatcommercialUSOperating Systemsaka red hat
and 10 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2025:9582
access.redhat.com
https://access.redhat.com/errata/RHSA-2025:9583
access.redhat.com
https://access.redhat.com/security/cve/CVE-2023-5379
access.redhat.com
and 2 more references View all →

Timeline

Published
Dec 12, 2023
Last Updated
Oct 25, 2025

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