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Security Bulletin: IBM Resilient vulnerable to username enumeration (CVE-2020-4635)

Security Bulletin


IBM Resilient could disclose sensitive information by allowing a user to enumerate usernames. An attacker may use this to determine if a user exists or not.

Vulnerability Details

CVEID:   CVE-2020-4635
DESCRIPTION:   IBM Resilient could disclose sensitive information by allowing a user to enumerate usernames.
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:L/I:N/A:N)

Affected Products and Versions

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


Users must upgrade to v40.1 of IBM Resilient in order to obtain a fix for this vulnerability. This version implements a rate-limiting and fuzzing feature to defend against such attacks.

You can upgrade the platform by following the instructions in the "Upgrade Procedure" section in the IBM Knowledge Center. 

Workarounds and Mitigations


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John Zuccato, Rodney Ryan, Chris Shepherd, Nathan Roane, Kamil Sarbinowski, Vince Dragnea, Troy Fisher and Elaheh Samani from IBM X-Force Ethical Hacking Team.

Change History

16 Mar 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.


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

Document Information

Modified date:
17 March 2021