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Security Bulletin: IBM MQ Internet Pass-Thru is vulnerable to a denial of service attack (CVE-2020-4766)

Security Bulletin


An issue was found within IBM MQ Internet Pass-Thru that could allow an attacker to execute a denial of service attack.

Vulnerability Details

CVEID:   CVE-2020-4766
DESCRIPTION:   IBM MQ Internet Pass-Thru could allow a remote user to cause a denial of service by sending malformed MQ data requests that would consume all available resources.
CVSS Base score: 5.9
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)

Affected Products and Versions

Affected Product(s) Version(s)
IBM MQ Internet Pass-Thru 2.1
IBM MQ Internet Pass-Thru 9.2


IBM MQ Internet Pass-Thru 2.1
Note: MQ IPT is provided on Solaris platforms only, for users with appropriate extended support entitlement. Users of MQ IPT 2.1 on all other platforms should migrate to one of the MQ IPT 9.2 levels listed below (or later).

IBM MQ Internet Pass-Thru 9.2 LTS

IBM MQ Internet Pass-Thru 9.2 CD

Workarounds and Mitigations


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Change History

20 Jan 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


[{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"ARM Category":[{"code":"a8m0z00000008OIAAY","label":"Connectivity->Internet Pass-Thru (IPT)"}],"ARM Case Number":"","Platform":[{"code":"PF002","label":"AIX"},{"code":"PF016","label":"Linux"},{"code":"PF027","label":"Solaris"},{"code":"PF033","label":"Windows"}],"Version":"All Version(s)"}]

Document Information

Modified date:
21 January 2021