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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


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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.


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":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"STHMCM","label":"IBM Elastic Storage Server"},"Component":"","Platform":[{"code":"PF016","label":"Linux"}],"Version":"6.1","Edition":"","Line of Business":{"code":"LOB26","label":"Storage"}}]

Document Information

Modified date:
23 May 2022