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    CVE-2025-9784

    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).

    Published:Sep 1, 2025
    Last Modified:Aug 19, 2026
    EPS:Sep 2, 2025
    EPSS Score:0.02325
    CVSS Score:7.5

    Affected Products

    Vendor
    Redhat
    Product
    Apache Camel Hawtio
    Vendor
    Redhat
    Product
    Apache Camel Spring Boot
    Vendor
    Redhat
    Product
    Build Of Apache Camel For Spring Boot
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Fuse
    Vendor
    Redhat
    Product
    Jboss Data Grid
    Vendor
    Redhat
    Product
    Jboss Enterprise Application Platform
    Vendor
    Redhat
    Product
    Jboss Enterprise Application Platform Els
    Vendor
    Redhat
    Product
    Jboss Enterprise Application Platform Eus
    Vendor
    Redhat
    Product
    Jboss Enterprise Application Platform Expansion Pack
    Vendor
    Redhat
    Product
    Jboss Enterprise Bpms Platform
    Vendor
    Redhat
    Product
    Jboss Fuse
    Vendor
    Redhat
    Product
    Jbosseapxp
    Vendor
    Redhat
    Product
    Process Automation
    Vendor
    Redhat
    Product
    Red Hat Single Sign On
    Vendor
    Redhat
    Product
    Single Sign-on
    Vendor
    Redhat
    Product
    Undertow

    Exploits

    https://github.com/drackyjr/CVE-2025-9784

    Related CVEs

    CVE-2026-80219 (CVSS 8.7) — A flaw was found in hawtio-operator. When deploying Hawtio in cluster mode, the operator creates a cluster-sco…
    CVE-2026-78234 (CVSS 9.9) — A flaw was found in hawtio-operator. The operator reads the OpenShift Service CA private signing key from the …
    CVE-2026-77968 (CVSS 8.2) — A flaw was found in hawtio-operator. The operator's ClusterRole grants secrets: [create, get, list, update, wa…
    CVE-2026-5680 (CVSS 7.5) — A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending specially crafted …
    CVE-2026-14180 (CVSS 5.3) — A flaw was found in the ChunkReader component of the Undertow HTTP server, which is used by WildFly and JBoss …
    CVE-2026-28369 (CVSS 8.7) — A flaw was found in Undertow. When Undertow receives an HTTP request where the first header line starts with o…
    CVE-2026-28367 (CVSS 8.7) — A flaw was found in Undertow. A remote attacker can exploit this vulnerability by sending `\r\r\r` as a header…
    CVE-2026-28368 (CVSS 8.7) — A flaw was found in Undertow. This vulnerability allows a remote attacker to construct specially crafted reque…
    CVE-2025-12543 (CVSS 9.6) — A flaw was found in the Undertow HTTP server core, which is used in WildFly, JBoss EAP, and other Java applica…
    CVE-2024-3884 (CVSS 7.5) — A flaw was found in Undertow that can cause remote denial of service attacks. When the server uses the FormEnc…

    References

    https://access.redhat.com/errata/RHSA-2025:23143
    https://access.redhat.com/errata/RHSA-2026:0383
    https://access.redhat.com/errata/RHSA-2026:0384
    https://access.redhat.com/errata/RHSA-2026:0386
    https://access.redhat.com/errata/RHSA-2026:33371
    https://access.redhat.com/errata/RHSA-2026:33372
    https://access.redhat.com/errata/RHSA-2026:3889
    https://access.redhat.com/errata/RHSA-2026:3891
    https://access.redhat.com/errata/RHSA-2026:3892
    https://access.redhat.com/errata/RHSA-2026:4915
    https://access.redhat.com/errata/RHSA-2026:4916
    https://access.redhat.com/errata/RHSA-2026:4917
    https://access.redhat.com/errata/RHSA-2026:4924
    https://access.redhat.com/security/cve/CVE-2025-9784
    https://bugzilla.redhat.com/show_bug.cgi?id=2392306
    https://github.com/undertow-io/undertow/pull/1778
    https://github.com/undertow-io/undertow/releases/tag/2.2.38.Final
    https://issues.redhat.com/browse/UNDERTOW-2598
    https://kb.cert.org/vuls/id/767506
    https://www.kb.cert.org/vuls/id/767506

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High