CVE-2021-20556: IBM Cognos Controller information disclosure

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-03 · updated 2026-06-17
Weakness: CWE-204

Description

IBM Cognos Controller 10.4.1, 10.4.2, and 11.0.0 could allow a remote user to enumerate usernames due to differentiating error messages on existing usernames. IBM X-Force ID: 199181.

Affected products

IBM Cognos Controller: 10.4.1, 10.4.2, 11.0.0

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/199181
https://www.ibm.com/support/pages/node/7149876
https://exchange.xforce.ibmcloud.com/vulnerabilities/199181
https://www.ibm.com/support/pages/node/7149876

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