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Security Bulletin: User Behavior Analytics application add on to IBM QRadar SIEM is vulnerable to cacheable SSL pages (CVE-2021-20391)

Security Bulletin


User Behavior Analytics application add on to IBM QRadar SIEM is vulnerable to cacheable SSL pages.

Vulnerability Details

CVEID:   CVE-2021-20391
DESCRIPTION:   IBM QRadar User Behavior Analytics allows web pages to be stored locally which can be read by another user on the system.
CVSS Base score: 4
CVSS Temporal Score: See: for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)

Affected Products and Versions

Affected Product(s)Version(s)
QRadar User Behavior Analytics1.0.0-4.1.0


Upgrade to version 4.1.1 or later

Workarounds and Mitigations


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

Change History

11 May 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":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSBQAC","label":"IBM Security QRadar SIEM"},"Component":"IBM QRadar User Behavior Analytics","Platform":[{"code":"PF016","label":"Linux"}],"Version":"1.0.0-4.1.1","Edition":"","Line of Business":{"code":"LOB24","label":"Security Software"}}]

Document Information

Modified date:
13 May 2021