CVE-2023-5379

published 2023-12-12

CVE-2023-5379: 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…

Priority P3 39 high 7.5 CVSS 3.1

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

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).

Affected

4 ranges

Vendor	Product	Version range	Fixed in
debian	undertow	< undertow 2.3.18-1 (forky)	undertow 2.3.18-1 (forky)
redhat	jboss_enterprise_application_platform	—	—
redhat	single_sign-on	—	—
redhat	undertow	>= 0 < 2.3.18-1	2.3.18-1

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

osv 7.5 HIGH

vendor_debian 7.5 HIGH

vendor_redhat 7.5 HIGH

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-770