VulnerabilityPublished 2 Sep 2025Updated 14 Oct 2026

CVE-2025-9784: Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 undertow · Unthrottled Resource Allocation

Affects Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 undertowSource CVE Database V5

Not known to be exploited · CVSS 7.5 High : upgrade Red Hat JBoss Enterprise Application Platform 7.1 EUS for RHEL 7 undertow to 2.2.38.Final soon.

Data as of 26 Oct 2026, 13:47 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 2.3% chance of exploitation in 30 days – higher than 83% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 2.2.38.Final

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 2 Sep 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade undertow to 2.2.38.Final.

Affected software

Product	Affected	Fixed in
undertow	Affected <2.2.38.Final	Fixed in 2.2.38.Final
GitHubundertow`pkg:github/undertow`Other threats	Affected <2.2.38.Final	Fixed in 2.2.38.Final

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Official patches addressing CVE-2025-9784 have been released by Red Hat for affected products such as Apache Camel for Spring Boot 4.14.2 and JBoss Enterprise Application Platform 8.1.3 for RHEL 8. Users should apply these security updates promptly. Before applying updates, ensure all previous errata are applied and back up existing installations. Refer to Red Hat advisories (e.g., RHSA-2025:23143, RHSA-2026:0383) for detailed remediation instructions. Patch status is confirmed as official-fix.

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).

Impact

Successful exploitation of this vulnerability can lead to denial of service by overwhelming the server with repeated stream aborts, causing excessive resource consumption and potential service disruption. There is no impact on confidentiality or integrity, only availability is affected. No known exploits in the wild have been reported at this time.

Summary

The vulnerability CVE-2025-9784 in Undertow involves the allocation of resources without limits or throttling when processing malformed client requests. These requests can trigger server-side HTTP/2 stream resets repeatedly without incrementing abuse counters, enabling malicious clients to cause excessive server workload and denial of service. This issue is categorized under CWE-404 (Improper Resource Shutdown or Release). The vulnerability has a CVSS v3.1 base score of 7.5 (High) with network attack vector, low attack complexity, no privileges or user interaction required, and impacts availability only. Red Hat has released official security advisories and patches for multiple products including Apache Camel 4.14.2 for Spring Boot and JBoss Enterprise Application Platform 8.1.3 for RHEL 8, which include fixes for this vulnerability.

CWE-404Improper Resource Shutdown or Release (opens in a new tab)
Class weaknessLikelihood of exploit: Medium
The product does not release or incorrectly releases a resource before it is made available for re-use.
Requirements · Language Selection
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation
It is good practice to be responsible for freeing all resources you allocate and to be consistent with how and where you free memory in a function. If you allocate memory that you intend to free upon completion of the function, you must be sure to free the memory at all exit points for that function including error…
Implementation
Memory should be allocated/freed using matching functions such as malloc/free, new/delete, and new[]/delete[].
Attack patterns
TCP Fragmentation (opens in a new tab)
UDP Fragmentation (opens in a new tab)
ICMP Fragmentation (opens in a new tab)
BlueSmacking (opens in a new tab)
Flooding (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 9 Aug 2026, 14:09 UTC

WeaknessesCWE-404

Technical details

References

Community reviews

Related threats