Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Jboss Enterprise Application Platform | - |
| Redhat | Single Sign-On | 7.0 |
| Redhat | Undertow | - |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2025:9582
- https://access.redhat.com/errata/RHSA-2025:9583
- https://access.redhat.com/security/cve/CVE-2023-5379Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2242099Issue Tracking
- https://access.redhat.com/errata/RHSA-2023:4509Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2023-5379Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2242099Issue Tracking
FAQ
What is CVE-2023-5379?
CVE-2023-5379 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 t...
How severe is CVE-2023-5379?
CVE-2023-5379 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-5379?
Check the references section above for vendor advisories and patch information. Affected products include: Redhat Jboss Enterprise Application Platform, Redhat Single Sign-On, Redhat Undertow.