Description
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).
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- RedHat / build_of_apache_camel_for_spring_boot
- RedHat / enterprise_linux9.0 – 9.0
- RedHat / enterprise_linux8.0 – 8.0
- RedHat / fuse7.0.0 – 7.0.0
- RedHat / jboss_enterprise_application_platform8.0.0 – 8.0.0
- RedHat / jboss_enterprise_application_platform7.0.0 – 7.0.0
- RedHat / jboss_enterprise_application_platform_expansion_pack
- RedHat / process_automation7.0 – 7.0
- RedHat / single_sign-on7.0 – 7.0
- RedHat / undertow
References
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2025:23143
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:0383
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:0384
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:0386
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:33371
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:33372
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:3889
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:3891
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:3892
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:4915
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:4916
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:4917
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:4924
- VENDOR_ADVISORYhttps://access.redhat.com/security/cve/CVE-2025-9784
- MISChttps://bugzilla.redhat.com/show_bug.cgi?id=2392306
- PATCHhttps://github.com/undertow-io/undertow/pull/1778
- PATCHhttps://github.com/undertow-io/undertow/releases/tag/2.2.38.Final
- MISChttps://issues.redhat.com/browse/UNDERTOW-2598
- MISChttps://kb.cert.org/vuls/id/767506
Updated 18m ago · 8 sources