CVE-2021-28055

Predictable CSRF tokens in centreon/centreon

An issue was discovered in Centreon-Web in Centreon Platform 20.10.0. The anti-CSRF token generation is predictable, which might allow CSRF attacks that add an admin user.

Security-sensitive operations rely on values that are predictable or insufficiently random. Typical impact: forged tokens, guessable identifiers, or broken cryptographic protocols.

CVE-2021-28055 has a CVSS score of 6.5 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (20.10.7, 20.04.13, 19.10.23, 2.8.37); upgrading removes the vulnerable code path.

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1. What is CVE-2021-28055? CVE-2021-28055 is a medium-severity use of insufficiently random values vulnerability in centreon/centreon (composer), affecting versions >= 20.10.0, < 20.10.7. It is fixed in 20.10.7, 20.04.13, 19.10.23, 2.8.37. Security-sensitive operations rely on values that are predictable or insufficiently random.
2. How severe is CVE-2021-28055? CVE-2021-28055 has a CVSS score of 6.5 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of centreon/centreon are affected by CVE-2021-28055? centreon/centreon (composer) versions >= 20.10.0, < 20.10.7 is affected.
4. Is there a fix for CVE-2021-28055? Yes. CVE-2021-28055 is fixed in 20.10.7, 20.04.13, 19.10.23, 2.8.37. Upgrade to this version or later.
5. Is CVE-2021-28055 exploitable, and should I be worried? Whether CVE-2021-28055 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2021-28055 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2021-28055?
   • Upgrade centreon/centreon to 20.10.7 or later
   • Upgrade centreon/centreon to 20.04.13 or later
   • Upgrade centreon/centreon to 19.10.23 or later
   • Upgrade centreon/centreon to 2.8.37 or later

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