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Security Bulletin: IBM MQ and IBM MQ Appliance are vulnerable to a denial of service attack caused by an error within the Data Conversion routine (CVE-2019-4655)

Security Bulletin


An error was found within the IBM MQ message data conversion processing code that could cause multiple failure data capture (FDC) records to be generated and prevent the channel handling process amqrmppa from handling requests.

Vulnerability Details

CVEID: CVE-2019-4655
DESCRIPTION: IBM MQ is vulnerable to a denial of service attack that would allow an authenticated user to reset client connections due to an error within the Data Conversion routine.
CVSS Base score: 4.3
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:L)

Affected Products and Versions

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


IBM MQ and IBM MQ Appliance V9.1 LTS
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IBM MQ and IBM MQ Appliance V9.1 CD
Upgrade to IBM MQ 9.1.4

Workarounds and Mitigations


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Change History

9 Dec 2019: 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


[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Component":"Server","Platform":[{"code":"PF002","label":"AIX"},{"code":"PF016","label":"Linux"},{"code":"PF010","label":"HP-UX"},{"code":"PF027","label":"Solaris"},{"code":"PF033","label":"Windows"}],"Version":",,,,9.1.1,9.1.2,9.1.3","Edition":"All","Line of Business":{"code":"LOB45","label":"Automation"}},{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SS5K6E","label":"IBM MQ Appliance"},"Component":"Server","Platform":[{"code":"PF004","label":"Appliance"}],"Version":"9.1;;;;9.1.1;9.1.2;9.1.3","Edition":"All","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
20 December 2019