CVE-2025-9784

highpriority · track · 11EPSS 0.023 · 83 %ileexploit · PoCDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

2.33% (83rd) EPSS

CVSS 7.5 · high

Is it mine?

88 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-26

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

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · secalert@redhat.com USexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV

v3.17.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Psecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-404USCWE-404USCWE-404USCWE-770USCWE-770USCWE-770US

exploits (1)

Public proof-of-concept and weaponised exploit code.

drackyjr/CVE-2025-9784drackyjr/CVE-2025-9784PoC · poc_in_github

affected products (88)

Products and version ranges known to be affected.

IBM InfoSphere Information Serverall versionscert_bundDEcpe:/a:ibm:infosphere_information_server:-
NetApp ActiveIQ Unified Managerall versionscert_bundDEcpe:/a:netapp:active_iq_unified_manager:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat JBoss Enterprise Application Platform <7.4.24all versionscert_bundDE
Red Hat JBoss Enterprise Application Platform <8.1.3all versionscert_bundDE
Red Hat JBoss Enterprise Application Platform< 7.4.24cert_bundDE
Red Hat JBoss Enterprise Application Platform< 8.1.3cert_bundDE
Red Hat Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7< 0:1.4.18-21.SP19_redhat_00001.1.ep7.el7enisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 7.3 EUS for RHEL 7< 0:2.0.41-8.SP9_redhat_00001.1.el7eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7< 0:2.2.39-1.Final_redhat_00001.1.el7eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7< 0:7.4.24-4.GA_redhat_00002.1.el7eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8< 0:2.2.39-1.Final_redhat_00001.1.el8eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8< 0:7.4.24-4.GA_redhat_00002.1.el8eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9< 0:2.2.39-1.Final_redhat_00001.1.el9eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9< 0:7.4.24-4.GA_redhat_00002.1.el9eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8< 0:1.0.0-3.redhat_00009.1.el8eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8< 0:1.83.0-1.redhat_00001.1.el8eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8< 0:2.0.2-1.Final_redhat_00001.1.el8eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8< 0:2.3.23-1.SP3_redhat_00001.1.el8eapenisa_euvdEU
Red Hat Red Hat JBoss Enterprise Application Platform 8.0 for RHEL 8< 0:33.0.0-2.jre_redhat_00003.1.el8eapenisa_euvdEU

showing 20 of 88

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-2204NetApp ActiveIQ Unified Manager (Undertow): Schwachstelle ermöglicht Denial of ServiceDeutsch2025-10-05csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in NetApp ActiveIQ Unified Manager und NetApp OnCommand Unified Manager ausnutzen, um einen Denial of Service Angriff durchzuführen.
WID-SEC-W-2026-0054Red Hat JBoss Enterprise Application Platform (Undertow): Mehrere SchwachstellenDeutsch2026-01-08csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Red Hat JBoss Enterprise Application Platform ausnutzen, um einen Denial of Service Zustand herbeizuführen, Daten zu manipulieren und um weitere Angriffe wie Cache-Poisoning und Session-Hijacking durchzuführen.
GHSA-95h4-w6j8-2rp8Undertow MadeYouReset HTTP/2 DDoS Vulnerability2025-09-02ghsa · osvUS
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).

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund osv NVD CVE.org MITRE

published 2025-09-02modified 2026-09-04

references (44)

External citations — patches, advisories, analysis.

scry

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