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Unrated severityNVD Advisory· Published Dec 12, 2023· Updated Feb 25, 2026

Undertow: ajp request closes connection exceeding maxrequestsize

CVE-2023-5379

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).

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

14
  • Red Hat/Red Hat JBoss Data Grid 7v5
    cpe:/a:redhat:jboss_data_grid:7
  • Red Hat/Red Hat Data Grid 8v5
    cpe:/a:redhat:jboss_data_grid:8
  • Red Hat/Jboss Enterprise Application Platformcpe-rescue3 versions
    cpe:/a:redhat:jboss_enterprise_application_platform:7+ 2 more
    • cpe:/a:redhat:jboss_enterprise_application_platform:7
    • cpe:/a:redhat:jboss_enterprise_application_platform_eus:7.1::el7range: 0:1.0.12-6.Final_redhat_00001.1.ep7.el7
    • cpe:/a:redhat:jboss_enterprise_application_platform_eus:7.3::el7range: 0:1.10.17-1.Final_redhat_00001.1.el7eap
  • Red Hat/Process Automationcpe-rescue
    cpe:/a:redhat:jboss_enterprise_bpms_platform:7
  • Red Hat/Red Hat Decision Manager 7v5
    cpe:/a:redhat:jboss_enterprise_brms_platform:7
  • Red Hat/Red Hat JBoss Fuse 6v5
    cpe:/a:redhat:jboss_fuse:6
  • Red Hat/Red Hat Fuse 7v5
    cpe:/a:redhat:jboss_fuse:7
  • Red Hat/Red Hat support for Spring Bootv5
    cpe:/a:redhat:openshift_application_runtimes:1.0
  • Red Hat/Red Hat build of Quarkusv5
    cpe:/a:redhat:quarkus:2
  • Red Hat/Single Sign Oncpe-rescue
    cpe:/a:redhat:red_hat_single_sign_on:7
  • Red Hat/Undertowllm-fuzzy
  • Red Hat/Jboss Eapllm-fuzzy

Patches

Vulnerability mechanics

References

4

News mentions

0

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