CVE-2025-3631Network attack vector

Authenticated service crash via AMQRMPPA use-after-free

Published Jul 11, 2025 · Updated Aug 18, 2025

Use-after-free in IBM MQ and MQ Appliance 9.3 and 9.4 allows remote authenticated users to crash AMQRMPPA via a client connection. IBM locates the fault in the AMQRMPPA channel process but does not disclose which object is freed or how client data causes its later access. A permitted MQ client connection is required, and successful exploitation terminates the channel process without reported data disclosure or modification.

CVSS severity6.5
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in IBM MQ and MQ Appliance 9.3 and 9.4 allows remote authenticated users to crash AMQRMPPA via a client connection. IBM locates the fault in the AMQRMPPA channel process but does not disclose which object is freed or how client data causes its later access. A permitted MQ client connection is required, and successful exploitation terminates the channel process without reported data disclosure or modification.

The record

CVE
CVE-2025-3631
Published
Jul 11, 2025
Updated
Aug 18, 2025
Vendor
IBM
Product
IBM MQ Appliance
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.3.2.0 CD <=9.3.5.2 CD
  2. Affected versionversion=9.4.0.0 LTS <=9.4.0.11 LTS
  3. Affected versionversion=9.4.1.0 CD <=9.4.2.1 CD

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM MQ Applianceversion=9.3.2.0 CD <=9.3.5.2 CD; version=9.4.0.0 LTS <=9.4.0.11 LTS; version=9.4.1.0 CD <=9.4.2.1 CD
IBM · IBM MQversion=9.3.2.0 CD <=9.3.5.1 CD; version=9.4.0.0 <=9.4.2.1 CD; version=9.4.0.0 LTS <=9.4.0.11 LTS

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5IBMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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