What’s Vulnerable › Vulnerabilities

CVE-2025-3631: IBM MQ denial of service

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-11 · updated 2026-06-17
• Weakness: CWE-416

Description

An IBM MQ 9.3 and 9.4 Client connecting to an MQ Queue Manager can cause a SIGSEGV in the AMQRMPPA channel process terminating it.

Affected products

• IBM MQ Appliance: from 9.3.2 through 9.3.5.2; from 9.4.0.0 before 9.4.0.12; from 9.4.0.0 before 9.4.3; from 9.4.1.0 before 9.4.3.0 — fixed in 9.4.0.12, 9.4.3, 9.4.3.0

How to fix

Upgrade to a fixed version: IBM MQ Appliance 9.4.0.12, 9.4.3, 9.4.3.0. Check the vendor advisory for mitigations.

References

• https://www.ibm.com/support/pages/node/7237025
• https://www.ibm.com/support/pages/node/7238310

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