CVE-2025-9784
Undertow: undertow madeyoureset http/2 ddos vulnerability
HIGH 7.5EPSS 2.3%
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
- Red Hat · undertow · Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 · Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7 · Red Hat JBoss Enterprise Application Platform 7.4.24 · Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 · Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
- CVSS v3.1 REDHAT
- 7.5 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS
- 2.33% chance of exploitation in the next 30 days, 83rd percentile
- Published
- 2025-09-02
- Updated
- 2026-10-14
Proof-of-concept exploits (1)
- drackyjr/CVE-2025-97842★ · 2025-10-17
Security advisories
- https://access.redhat.com/security/cve/CVE-2025-9784
- advisories/GHSA-95h4-w6j8-2rp8
- https://bugzilla.redhat.com/show_bug.cgi?id=2392306
- https://kb.cert.org/vuls/id/767506
- https://www.kb.cert.org/vuls/id/767506