IBM Cognos Controller 10.4.1/10.4.2/11.0.0: Username Enumeration via Error Differ
CVE-2021-20556 Published on May 3, 2024
IBM Cognos Controller information disclosure
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.
Vulnerability Analysis
CVE-2021-20556 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
Observable Response Discrepancy
The product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere. This issue frequently occurs during authentication, where a difference in failed-login messages could allow an attacker to determine if the username is valid or not. These exposures can be inadvertent (bug) or intentional (design).
Products Associated with CVE-2021-20556
Want to know whenever a new CVE is published for IBM Cognos Controller? stack.watch will email you.
Affected Versions
IBM Cognos Controller:- Version 10.4.1, 10.4.2, 11.0.0 is affected.
- Version 10.4.1 is affected.
- Version 10.4.2 is affected.
- Version 11.0.0 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.