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Security Bulletin: Resilient supports TLS1.2 ciphers that are not enabled for Perfect Forward Secrecy (PFS) (CVE-2021-20566)

Security Bulletin


Resilient supports TLS1.2 ciphers that are not enabled for Perfect Forward Secrecy (PFS). Such ciphers could allow an attacker who has recorded encrypted traffic and later obtains the server's key to decrypt highly sensitive information.

Vulnerability Details

CVEID:   CVE-2021-20566
DESCRIPTION:   IBM Resilient OnPrem uses weaker than expected cryptographic algorithms that could allow an attacker to decrypt highly sensitive information.
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:H/I:N/A:N)

Affected Products and Versions

Affected Product(s)Version(s)
Resilient OnPremIBM Security SOAR


Users must upgrade to v41.0 of IBM Security SOAR (previously known as IBM Resilient) in order to obtain a fix for this vulnerability. Only TLS1.2 ciphers enabled for Perfect Forward Secrecy (PFS) are enabled.

You can upgrade the platform by following the instructions in the "Upgrade Procedure" section in the IBM Resilient Security Orchestration, Automation and Response Platform documentation. 

Workarounds and Mitigations


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Change History

08 Jun 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.


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.

Document Location


[{"Business Unit":{"code":"BU008","label":"Security"},"Product":{"code":"SSDVCX","label":"IBM Resilient"},"Component":"","Platform":[{"code":"PF043","label":"Red Hat"}],"Version":"IBM Resilient SOAR V38.0","Edition":""}]

Document Information

Modified date:
15 June 2021