CVSS 3.1 Score 5.3 of 10 (medium)


Published May 3, 2024
Updated: May 6, 2024
CWE ID 204


CVE-2021-20556 is a vulnerability that affects IBM Cognos Controller versions 10.4.1, 10.4.2, and 11.0.0. It allows a remote user to determine valid usernames by exploiting different error messages. The vulnerability has a base severity rating of MEDIUM with a base score of 5.3 according to the Common Vulnerability Scoring System (CVSS) version 3.1. The potential danger it poses to organizations is considered low in terms of confidentiality impact, but it does not require any privileges or user interaction to exploit. To remediate this vulnerability, organizations using the affected versions of IBM Cognos Controller should apply the necessary updates or patches provided by IBM to address the issue and prevent remote enumeration of usernames.

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