Red Hat Undertow HTTP/2 MadeYouReset denial of service

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability has been found in Red Hat Undertow and classified as problematic. Affected is an unknown function of the component HTTP2 Handler. Performing a manipulation results in denial of service. This vulnerability is identified as CVE-2025-9784. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in Red Hat Undertow (the affected version unknown). This affects an unknown part of the component HTTP2 Handler. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. The summary by CVE is:

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).

The advisory is shared at bugzilla.redhat.com. This vulnerability is uniquely identified as CVE-2025-9784. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/06/2025). MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 261317 (Linux Distros Unpatched Vulnerability : CVE-2025-9784), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (261317), EUVD (EUVD-2025-26388) and CERT Bund (WID-SEC-2025-2204). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • NetApp ActiveIQ Unified Manager
  • NetApp OnCommand Unified Manager

Productinfo

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 261317
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-9784

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

09/01/2025 Advisory disclosed
09/01/2025 +0 days VulDB entry created
10/06/2025 +35 days VulDB entry last update

Sourcesinfo

Vendor: redhat.com

Advisory: bugzilla.redhat.com
Status: Confirmed

CVE: CVE-2025-9784 (🔒)
GCVE (CVE): GCVE-0-2025-9784
GCVE (VulDB): GCVE-100-322101
EUVD: 🔒
CERT Bund: WID-SEC-2025-2204 - NetApp ActiveIQ Unified Manager (Undertow): Schwachstelle ermöglicht Denial of Service

Entryinfo

Created: 09/01/2025 10:32
Updated: 10/06/2025 13:39
Changes: 09/01/2025 10:32 (50), 09/02/2025 16:44 (12), 09/08/2025 20:21 (2), 09/12/2025 14:08 (1), 10/06/2025 13:39 (7)
Complete: 🔍
Cache ID: 216::103

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