CVE-2023-5379
This issue could allow a malicious user could to repeatedly send requests that exceed the max-header-size, causing a Denial of Service (DoS).
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.02%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.02% probability · 61th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-770
- Affected
- redhat/jboss enterprise application platform · redhat/single sign-on · redhat/undertow
- Source
- secalert@redhat.com
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.