CVE-2023-5379

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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": [{"vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "eap7-glassfish-el", "defaultStatus": "affected", "versions": [{"version": "0:3.0.1-4.b08_redhat_00005.1.ep7.el7", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:jboss_enterprise_application_platform_eus:7.1::el7"]}, {"vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "eap7-hibernate", "defaultStatus": "affected", "versions": [{"version": "0:5.1.17-3.Final_redhat_00004.1.ep7.el7", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": 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"cveTags": [], "descriptions": [{"lang": "en", "value": "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)."}, {"lang": "es", "value": "Se encontr\u00f3 una falla en Undertow. Cuando se env\u00eda una solicitud AJP que excede el atributo max-header-size en ajp-listener, mod_cluster marca JBoss EAP en estado de error en httpd, lo que hace que JBoss EAP cierre la conexi\u00f3n TCP sin devolver una respuesta AJP. Esto sucede porque mod_proxy_cluster marca la instancia de JBoss EAP como un trabajador de error cuando la conexi\u00f3n TCP se cierra desde el backend despu\u00e9s de enviar la solicitud AJP sin recibir una respuesta AJP y deja de reenviar. Este problema podr\u00eda permitir que un usuario malintencionado env\u00ede repetidamente solicitudes que superen el tama\u00f1o m\u00e1ximo del encabezado, provocando una Denegaci\u00f3n de Servicio (DoS)."}], "id": "CVE-2023-5379", "lastModified": "2026-11-05T12:17:32.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "secalert@redhat.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-5379", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2023-12-18T21:09:22.233848Z", "version": "2.0.3"}}]}, "published": "2023-12-12T22:15:22.410", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:9582"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:9583"}, {"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2023-5379"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2242099"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/errata/RHSA-2023:4509"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2023-5379"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2242099"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-770"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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"2025-06-25T00:00:00Z"}, {"advisory": "RHSA-2025:9583", "cpe": "cpe:/a:redhat:jboss_enterprise_application_platform_eus:7.3::el7", "package": "eap7-wildfly-elytron-0:1.10.17-1.Final_redhat_00001.1.el7eap", "product_name": "Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7", "release_date": "2025-06-25T00:00:00Z"}], "bugzilla": {"description": "undertow: AJP Request closes connection exceeding maxRequestSize", "id": "2242099", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2242099"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "verified"}, "cwe": "CWE-400->CWE-770", "details": ["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).", "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)."], "name": "CVE-2023-5379", "package_state": [{"cpe": "cpe:/a:redhat:quarkus:2", "fix_state": "Not affected", "package_name": "io.quarkus/quarkus-undertow", "product_name": "Red Hat build of Quarkus"}, {"cpe": "cpe:/a:redhat:jboss_data_grid:8", "fix_state": "Not affected", "package_name": "undertow", "product_name": "Red Hat Data Grid 8"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_brms_platform:7", "fix_state": "Out of support scope", "package_name": "undertow", "product_name": "Red Hat Decision Manager 7"}, {"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Out of support scope", "package_name": "undertow", "product_name": "Red Hat Fuse 7"}, {"cpe": "cpe:/a:redhat:jboss_data_grid:7", "fix_state": "Out of support scope", "package_name": "undertow", "product_name": "Red Hat JBoss Data Grid 7"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:7", "fix_state": "Affected", "package_name": "undertow", "product_name": "Red Hat JBoss Enterprise Application Platform 7"}, {"cpe": "cpe:/a:redhat:jboss_fuse:6", "fix_state": "Out of support scope", "package_name": "undertow", "product_name": "Red Hat JBoss Fuse 6"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_bpms_platform:7", "fix_state": "Out of support scope", "package_name": "undertow", "product_name": "Red Hat Process Automation 7"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Will not fix", "package_name": "undertow", "product_name": "Red Hat Single Sign-On 7"}, {"cpe": "cpe:/a:redhat:openshift_application_runtimes:1.0", "fix_state": "Not affected", "package_name": "undertow", "product_name": "Red Hat support for Spring Boot"}], "public_date": "2023-12-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-5379\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-5379"], "statement": "Due to AJP packet size limitation by ProxyIOBufferSize (default: 8192, max: 65536) directive on httpd side, AJP packets larger than 64KB will not reach JBoss EAP. The default value of max-header-size in JBoss EAP 7 is 1048576 (1MiB), therefore, only JBoss EAP instances with max-header-size set to 64 KB or less may be affected by this issue.", "threat_severity": "Moderate"}

{}