IBM Support

Security Bulletin: IBM QRadar SIEM is vulnerable to denial of service attack due to CVE-2021-39041

Security Bulletin


The Common and TCPMultilineSyslog protocol components as used by IBM QRadar SIEM contain vulnerabilities which may allow for denial of service attacks. IBM has addressed the relevant CVE.

Vulnerability Details

CVEID:   CVE-2021-39041
DESCRIPTION:   IBM QRadar SIEM may be vulnerable to partial denial of service attack, resulting in some protocols not listening to specified ports.
CVSS Base score: 3.7
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:L)

Affected Products and Versions

Affected Product(s)Version(s)
IBM QRadar SIEM v7.3

All PROTOCOL-Common versions before PROTOCOL-Common-7.3-20220608132603

All PROTOCOL-TCPMultilineSyslog versions before PROTOCOL-TCPMultilineSyslog-7.3-20220531145432

IBM QRadar SIEM v7.4

All PROTOCOL-Common versions before PROTOCOL-Common-7.4-20220608234024

All PROTOCOL-TCPMultilineSyslog versions before PROTOCOL-TCPMultilineSyslog-7.4-20220531145346

IBM QRadar SIEM v7.5

All PROTOCOL-Common versions before PROTOCOL-Common-7.5-20220608234038

All PROTOCOL-TCPMultilineSyslog versions before PROTOCOL-TCPMultilineSyslog-7.5-20220531145302


IBM encourages customers to update their systems promptly.

See the Related Information section below for instructions on verifying your currently installed version.



IBM QRadar SIEM7.3



IBM QRadar SIEM7.4



IBM QRadar SIEM7.5




Workarounds and Mitigations


Get Notified about Future Security Bulletins




Change History

11 Jul 2022: 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.


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. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.

Document Location


[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSBQAC","label":"IBM QRadar SIEM"},"Component":"","Platform":[{"code":"PF016","label":"Linux"}],"Version":"7.3, 7.4, 7.5","Edition":"","Line of Business":{"code":"LOB24","label":"Security Software"}},{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSBQAC","label":"IBM QRadar SIEM"},"Component":"","Platform":[{"code":"PF016","label":"Linux"}],"Version":"7.4.0","Edition":"","Line of Business":{"code":"LOB24","label":"Security Software"}},{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSBQAC","label":"IBM QRadar SIEM"},"Component":"","Platform":[{"code":"PF016","label":"Linux"}],"Version":"7.5.0","Edition":"","Line of Business":{"code":"LOB24","label":"Security Software"}}]

Document Information

Modified date:
11 July 2022