CVE-2021-20455: IBM Cognos Controller

Low severity, CVSS 3.7. EPSS: 0.5% chance of exploitation in the next 30 days.

IBM Cognos Controller 11.0.0 through 11.0.1 and IBM Controller 11.1.0 could allow a remote attacker to obtain sensitive information when a detailed technical error message is returned in the browser. This information could be used in further attacks against the system.

Affected products

• IBM Cognos Controller: from 11.0.0, up to and including 11.0.1
• IBM Controller: version 11.1.0 only

Published 2025-01-07. Last modified 2026-06-17.