{"id":"UBUNTU-CVE-2025-9784","details":"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).","modified":"2026-05-20T16:24:05.005290873Z","published":"2025-09-02T14:15:00Z","upstream":["CVE-2025-9784"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-9784"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-9784"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2025-9784"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2392306"}],"affected":[{"package":{"name":"resteasy","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/resteasy?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.6-3","3.0.6-3ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libresteasy-java","binary_version":"3.0.6-3ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-9784.json"}},{"package":{"name":"undertow","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/undertow?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.4-1","1.3.5-1","1.3.7-1","1.3.11-1","1.3.16-1","1.3.16-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libundertow-java","binary_version":"1.3.16-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-9784.json"}},{"package":{"name":"undertow","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/undertow?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.20-1","1.4.21-1","1.4.22-1","1.4.23-1","1.4.23-2build1","1.4.23-3","1.4.23-3ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libundertow-java","binary_version":"1.4.23-3ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-9784.json"}},{"package":{"name":"resteasy","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/resteasy?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.6.2-2","3.6.2-2ubuntu0.20.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libresteasy-java","binary_version":"3.6.2-2ubuntu0.20.04.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-9784.json"}},{"package":{"name":"undertow","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/undertow?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.23-1","2.0.27-1","2.0.28-1","2.0.29-1","2.0.29-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libundertow-java","binary_version":"2.0.29-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-9784.json"}},{"package":{"name":"resteasy","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/resteasy?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.6.2-2","3.6.2-2ubuntu0.22.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.6.2-2ubuntu0.22.04.1~esm1","binary_name":"libresteasy-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-9784.json"}},{"package":{"name":"undertow","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/undertow?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.8-1","2.2.12-1","2.2.13-1","2.2.14-1","2.2.16-1","2.2.16-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.2.16-1ubuntu0.1~esm1","binary_name":"libundertow-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-9784.json"}},{"package":{"name":"resteasy","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/resteasy?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.6.2-2","3.6.2-2ubuntu0.24.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.6.2-2ubuntu0.24.04.1~esm1","binary_name":"libresteasy-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-9784.json"}},{"package":{"name":"undertow","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/undertow?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.8-2","2.3.8-2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.3.8-2ubuntu0.1~esm1","binary_name":"libundertow-java"}]},"database_specific":{"source":"https:/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