CVE-2025-9784

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-9784", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2025-09-01T06:33:05.239Z", "datePublished": "2025-09-02T13:37:59.772Z", "dateUpdated": "2026-11-04T21:46:23.817Z"}, "containers": {"cna": {"title": "Undertow: undertow madeyoureset http/2 ddos vulnerability", "metrics": [{"other": {"content": {"value": "Important", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"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"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A flaw was found in Undertow where malformed client requests can trigger server-side stream resets without triggering abuse counters. This issue, referred to as the \"MadeYouReset\" attack, allows malicious clients to induce excessive server workload by repeatedly causing server-side stream aborts. While not a protocol bug, this highlights a common implementation weakness that can be exploited to cause a denial of service (DoS)."}], "affected": [{"versions": [{"status": "affected", "version": "0", "lessThan": "2.2.38.Final", "versionType": "semver"}], "packageName": "undertow", "collectionURL": "https://github.com/undertow-io/undertow/", "defaultStatus": "unaffected"}, {"vendor": "Red Hat", "product": "Red Hat build of Apache Camel 4.14.2 for Spring Boot 3.5.8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "packageName": "undertow-core", "cpes": ["cpe:/a:redhat:apache_camel_spring_boot:4.14"]}, {"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-undertow", "defaultStatus": "affected", "versions": [{"version": "0:1.4.18-21.SP19_redhat_00001.1.ep7.el7", "lessThan": 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Aunque no es un error de protocolo, esto destaca una debilidad de implementaci\u00f3n com\u00fan que puede ser explotada para causar una denegaci\u00f3n de servicio (DoS)."}], "id": "CVE-2025-9784", "lastModified": "2026-11-04T22:17:40.723", "metrics": {"cvssMetricV31": [{"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": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-9784", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-09-02T13:55:22.694531Z", "version": "2.0.3"}}]}, "published": "2025-09-02T14:15:36.593", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:23143"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:0383"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:0384"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:0386"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:33371"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:33372"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:3889"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:3891"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:3892"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:4915"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:4916"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:4917"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:4924"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:76128"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:76129"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:76130"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:76132"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:76134"}, {"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2025-9784"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2392306"}, {"source": "secalert@redhat.com", "url": "https://github.com/undertow-io/undertow/pull/1778"}, {"source": "secalert@redhat.com", "url": "https://github.com/undertow-io/undertow/releases/tag/2.2.38.Final"}, {"source": "secalert@redhat.com", "url": "https://issues.redhat.com/browse/UNDERTOW-2598"}, {"source": "secalert@redhat.com", "url": "https://kb.cert.org/vuls/id/767506"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://www.kb.cert.org/vuls/id/767506"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-404"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "undertow: Undertow MadeYouReset HTTP/2 DDoS Vulnerability", "id": "2392306", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2392306"}, "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:N/I:N/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "mitigation": {"lang": "en:us", "value": "No mitigation is currently available that meets Red Hat Product Security\u2019s standards for usability, deployment, applicability, or stability."}, "name": "CVE-2025-9784", "package_state": [{"cpe": "cpe:/a:redhat:camel_spring_boot:4", "fix_state": "Affected", "package_name": "undertow-core", "product_name": "Red Hat build of Apache Camel for Spring Boot 4"}, {"cpe": "cpe:/a:redhat:apache_camel_hawtio:4", "fix_state": "Affected", "package_name": "undertow-core", "product_name": "Red Hat build of Apache Camel - HawtIO 4"}, {"cpe": "cpe:/a:redhat:jboss_data_grid:8", "fix_state": "Affected", "package_name": "undertow-core", "product_name": "Red Hat Data Grid 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "moditect", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "pki-core:10.6/resteasy", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "pki-deps:10.6/resteasy", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "resteasy", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Affected", "package_name": "undertow-core", "product_name": "Red Hat Fuse 7"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:7", "fix_state": "Affected", "package_name": "undertow-core", "product_name": "Red Hat JBoss Enterprise Application Platform 7"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:8", "fix_state": "Affected", "package_name": "org.jberet-jberet-parent", "product_name": "Red Hat JBoss Enterprise Application Platform 8"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:8", "fix_state": "Affected", "package_name": "org.jboss.eap-jboss-eap-xp", "product_name": "Red Hat JBoss Enterprise Application Platform 8"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:8", "fix_state": "Affected", "package_name": "undertow-core", "product_name": "Red Hat JBoss Enterprise Application Platform 8"}, {"cpe": "cpe:/a:redhat:jbosseapxp", "fix_state": "Affected", "package_name": "org.jboss.eap-jboss-eap-xp", "product_name": "Red Hat JBoss Enterprise Application Platform Expansion Pack"}, {"cpe": "cpe:/a:redhat:jbosseapxp", "fix_state": "Affected", "package_name": "undertow-core", "product_name": "Red Hat JBoss Enterprise Application Platform Expansion Pack"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_bpms_platform:7", "fix_state": "Affected", "package_name": "undertow-core", "product_name": "Red Hat Process Automation 7"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Affected", "package_name": "undertow-core", "product_name": "Red Hat Single Sign-On 7"}], "public_date": "2025-09-01T06:21:54Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-9784\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-9784"], "statement": "This vulnerability is rated with an Important severity. It is simple to exploit because it does not require authentication and could result in a Denial of Service (DoS). While some DoS flaws are classified as Moderate, \u201cMadeYouReset\u201d is Important because of the limited barriers (no specialized tooling or advanced scripting) to exploitation which directly impacts service availability. The vulnerability arises from an implementation weakness in HTTP/2 stream reset handling \u2014 malformed client requests can trigger server-side resets without incrementing abuse counters, allowing an attacker to bypass built-in request throttling and overhead limits. Since these resets consume CPU and memory resources and can be generated at scale over a single TCP/TLS connection, a remote attacker could exhaust server capacity quickly, impacting all legitimate clients.", "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-28T10:51:22.427132+00:00", "value": {"mitigation_remediation": ["Apply the Red\u202fHat security updates referenced in the errata (RHSA\u20112025:23143 and the subsequent RHSA\u20112026 releases) so that the Undertow library is upgraded to 2.2.38.Final or newer.", "Deploy the patched JBoss/Red\u202fHat Enterprise products that include the updated Undertow component; verify that the deployed Undertow version matches the patched release.", "Apply network\u2011layer controls such as rate limiting or HTTP/2 stream reset filtering to reduce the effect of an unpatched or partially patched environment until a full upgrade can be performed."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Red Hat products that embed Undertow. All affected releases include Red Hat Enterprise Linux\u202f10,\u202f9, and\u202f8; Red Hat JBoss Enterprise Application Platform\u202f7.4 (including the ELS variants on RHEL\u202f7,\u202f8,\u202f9); Red Hat JBoss Enterprise Application Platform\u202f8.0,\u202f8.1 (and their corresponding ELS variants for RHEL\u202f8 and\u202f9); Red Hat JBoss Enterprise Application Platform\u202f8 (generic); Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Data Grid\u202f8; Red\u00a0Hat Fuse\u202f7; Red\u00a0Hat Process Automation\u202f7; Red\u00a0Hat Single Sign\u2011On\u202f7; and the Red\u00a0Hat build of Apache Camel \u2013 HawtIO\u202f4 as well as the Red\u00a0Hat build of Apache Camel\u202f4.14.2 for Spring Boot\u202f3.5.8. The flaw is present in all these releases until the 2.2.38.Final Undertow update or later.", "description_and_impact": "A flaw was found in Undertow where malformed client requests can trigger server\u2011side stream resets without triggering abuse counters. The issue, called the \u201cMadeYouReset\u201d attack, lets malicious clients repeatedly cause stream aborts that consume significant server resources, effectively exhausting processing capacity and violating availability. This is not a protocol error but an implementation weakness that allows an attacker to force the server into a costly state without triggering normal countermeasures.", "risk_and_exploitability": "The CVSS score is 7.5 and the EPSS score of 2\u202f% indicates a moderate likelihood of exploitation. The vulnerability is not listed in the CISA KEV catalog, but its high impact and network\u2011based attack vector (HTTP/2 client requests) make it a significant risk. An attacker can trigger the issue from any network position that can communicate with the Undertow server; no authentication or special privileges are required. The lack of abuse counters means repeated resets can be sent at line speed without detection, leading to sustained denial of service."}}}}, "created": "2026-04-28T11:00:14.151135+00:00", "updated": "2026-04-28T11:00:14.151164+00:00", "vendors": []}