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Security Bulletin: Malformed message headers could cause message transmission to be blocked through channels resulting in denial of service in IBM MQ(CVE-2018-1503)

Security Bulletin


IBM MQ RCVR or CLUSRCVR type channels could go into retry status after receiving messages containing invalid or malformed headers. This results in blocking of further transmission of messages.

Vulnerability Details

CVEID: CVE-2018-1503
DESCRIPTION: IBM MQ could allow a remotely authenticated attacker to send invalid or malformed headers that could cause messages to no longer be transmitted via the affected channel.
CVSS Base Score: 4.3
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
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

IBM WebSphere MQ v7.5.0.0 to

IBM WebSphere MQ v8.0.0.0 to



IBM WebSphere MQ v7.5.0.0 to

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IBM WebSphere MQ v8.0.0.0 to

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Change History

18th July 2018 - Republish

*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.


According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

[{"Product":{"code":"SSFKSJ","label":"WebSphere MQ"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Component":"Channels LU62 \/ TCP","Platform":[{"code":"PF002","label":"AIX"},{"code":"PF010","label":"HP-UX"},{"code":"PF012","label":"IBM i"},{"code":"PF016","label":"Linux"},{"code":"PF027","label":"Solaris"},{"code":"PF033","label":"Windows"}],"Version":"9.0;8.0;7.5","Edition":"Edition Independent","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
20 July 2018