What is CVE-2021-21431?

CVE-2021-21431 is a high-severity improper input validation vulnerability in sopel-plugins.channelmgnt (pip), affecting versions < 2.0.1. It is fixed in 2.0.1. The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths.

How severe is CVE-2021-21431?

CVE-2021-21431 has a CVSS score of 7.6 (High). 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.

Which versions of sopel-plugins.channelmgnt are affected by CVE-2021-21431?

sopel-plugins.channelmgnt (pip) versions < 2.0.1 is affected.

Is there a fix for CVE-2021-21431?

Yes. CVE-2021-21431 is fixed in 2.0.1. Upgrade to this version or later.

Is CVE-2021-21431 exploitable, and should I be worried?

Whether CVE-2021-21431 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.

What actually determines whether CVE-2021-21431 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.

How do I fix CVE-2021-21431?

Upgrade sopel-plugins.channelmgnt to 2.0.1 or later.

CVE-2021-21431 in sopel-plugins.channelmgnt

Q: How severe is CVE-2021-21431?

CVE-2021-21431 has a CVSS score of 7.6 (High). 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.

Q: Which versions of sopel-plugins.channelmgnt are affected by CVE-2021-21431?

sopel-plugins.channelmgnt (pip) versions < 2.0.1 is affected.

Q: Is there a fix for CVE-2021-21431?

Yes. CVE-2021-21431 is fixed in 2.0.1. Upgrade to this version or later.

Q: Is CVE-2021-21431 exploitable, and should I be worried?

Whether CVE-2021-21431 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.

Q: What actually determines whether CVE-2021-21431 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.

Q: How do I fix CVE-2021-21431?

Upgrade sopel-plugins.channelmgnt to 2.0.1 or later.

Summary

Improper Input Validation in sopel-plugins.channelmgnt

Workarounds

Do not use this plugin on networks where TARGMAX > 1.

For more information

If you have any questions or comments about this advisory:

Open an issue on phab.
Email us at staff(at)mirahezebots(dot)org

Impact

On some IRC servers, restrictions around the removal of the bot using the kick/kickban command could be bypassed when kicking multiple users at once.
We also believe it may have been possible to remove users from other channels but due to the wonder that is IRC and following RfCs, We have no POC for that.

Freenode is not affected.

The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths. Typical impact: varies by context: data corruption, logic bypass, or denial of service.

CVE-2021-21431 has a CVSS score of 7.6 (High). The vector is reachable from an adjacent network, high 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 (2.0.1); upgrading removes the vulnerable code path.

Affected versions

sopel-plugins.channelmgnt (< 2.0.1)

Security releases

sopel-plugins.channelmgnt → 2.0.1 (pip)

Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

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. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.

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Remediation advice

Upgrade to 2.0.1 or higher

Frequently Asked Questions

What is CVE-2021-21431? CVE-2021-21431 is a high-severity improper input validation vulnerability in sopel-plugins.channelmgnt (pip), affecting versions < 2.0.1. It is fixed in 2.0.1. The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths.
How severe is CVE-2021-21431? CVE-2021-21431 has a CVSS score of 7.6 (High). 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.
Which versions of sopel-plugins.channelmgnt are affected by CVE-2021-21431? sopel-plugins.channelmgnt (pip) versions < 2.0.1 is affected.
Is there a fix for CVE-2021-21431? Yes. CVE-2021-21431 is fixed in 2.0.1. Upgrade to this version or later.
Is CVE-2021-21431 exploitable, and should I be worried? Whether CVE-2021-21431 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
What actually determines whether CVE-2021-21431 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.
How do I fix CVE-2021-21431? Upgrade sopel-plugins.channelmgnt to 2.0.1 or later.