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Security Bulletin: IBM MQ Appliance is affected by a denial of service vulnerability (CVE-2020-4931)

Security Bulletin


IBM MQ Appliance has resolved a denial of service vulnerability for AMQP channels.

Vulnerability Details

CVEID:   CVE-2020-4931
DESCRIPTION:   IBM MQ AMQP Channels could allow an authenticated user to cause a denial of service due to an issue processing messages.
CVSS Base score: 6.5
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

Affected Product(s) Version(s)
IBM MQ Appliance 9.1 LTS
IBM MQ Appliance 9.2 LTS
IBM MQ Appliance 9.1 CD


This vulnerability is addressed by APAR IT34885.
IBM MQ Appliance 9.1 LTS

Apply fixpack, or later maintenance.

IBM MQ Appliance 9.1 CD

Upgrade to 9.2.1 CD, or later.

IBM MQ Appliance 9.2 LTS

Apply ifix for APAR IT34885, or later maintenance.

Workarounds and Mitigations


Get Notified about Future Security Bulletins



Change History

22 Feb 2021: Initial Publication

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.


Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

Document Location


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Document Information

Modified date:
23 February 2021