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Security Bulletin: A vulnerability has been identified in IBM Spectrum Scale which is packaged in IBM ESS (CVE-2020-4926)

Security Bulletin


A security vulnerability has been identified in all levels of IBM Spectrum Scale which is packaged in IBM ESS where an unauthorized user can send arbitrary data to the CLI commands and daemon. A fix for this vulnerability is available.

Vulnerability Details

CVEID:   CVE-2020-4926
DESCRIPTION:   A vulnerability in the Spectrum Scale core component could allow unauthorized access to user data or injection of arbitrary data in the communication protocol.
CVSS Base score: 5.7
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N)

Affected Products and Versions

Affected Product(s)Version(s)
IBM Elastic Storage SystemALL


For IBM ESS levels lower than V6.1.3, apply V6.1.3 or later available from FixCentral at:

In addition to applying the recommended code level, ensure that the tscCmdAllowRemoteConnections configuration parameter is set to 'no', which requires a cluster minimum release level of 5.1.3 or later. Setting tscCmdAllowRemoteConnections to 'no' in a multi-cluster setting must be done after ensuring that the remote clusters are running Spectrum Scale v5.1.3 or later

See <<mmchconfig command>> for more details -


Note : Systems running supported version should be upgraded to the current release containing the security fixes.


Workarounds and Mitigations


Get Notified about Future Security Bulletins



Change History

18 May 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


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Document Information

Modified date:
23 May 2022