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Security Bulletin: IBM MQ AMQP channels fail to block connections restricted by SSLPEER setting (CVE-2020-4320)

Security Bulletin


An error was found within the SSLPEER logic within a AMQP channel which meant that it would not block/allow certificates as expected.

Vulnerability Details

CVEID:   CVE-2020-4320
DESCRIPTION:   IBM MQ Appliance and IBM MQ AMQP Channels 8.0, 9.0 LTS, 9.1 LTS, and 9.1 CD do not correctly block or allow clients based on the certificate distinguished name SSLPEER setting. IBM X-Force ID: 177403.
CVSS Base score: 5.3
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

Affected Product(s) Version(s)
IBM MQ Appliance 8.0
IBM MQ Appliance 9.1 LTS
IBM MQ Appliance 9.1 CD


IBM MQ Appliance V8
Apply FixPack
IBM MQ Appliance V9.1 LTS
Apply FixPack

IBM MQ Appliance V9.1 CD
Apply FixPack 9.1.5

Workarounds and Mitigations


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Change History

26 Jun 2020: 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":"SS5K6E","label":"IBM MQ Appliance"},"Component":"","Platform":[{"code":"PF004","label":"Appliance"}],"Version":";;;;;;;;;;;;;;;;;;;9.1.1;9.1.2;9.1.3;9.1.4","Edition":"","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
26 June 2020