CVE-2021-21431: sopel-channelmgnt is a channelmgnt plugin for sopel

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

channelmgnt: upgrade to 2.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-21431 being exploited?

CVE-2021-21431 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-21431 affect?

CVE-2021-21431 affects channelmgnt. Severity is high (CVSS 7.6). sopel-channelmgnt is a channelmgnt plugin for sopel. In versions prior to 2.0.1, 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 b

This month

HIGH 7.6UPGRADE

CVE-2021-21431 is a high-severity flaw (CVSS 7.6) affecting channelmgnt. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

sopel-channelmgnt is a channelmgnt plugin for sopel. In versions prior to 2.0.1, 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. This is fixed in version 2.0.1. As a

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.6 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-20, CWE-284
Published	2021-04-09
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: mirahezebots

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-04-09 16:15 UTCPublished CVE record published
2026-06-17 03:35 UTCUpdated Record last modified

mirahezebots channelmgnt UPGRADE

Affected: < 2.0.1

Fixed in: 2.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy channelmgnt || rpm -q channelmgnt || channelmgnt --version

2. UPGRADE to 2.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade channelmgnt

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade channelmgnt

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-21431?

channelmgnt: upgrade to 2.0.1. Exact commands for each OS are on this page.

Is CVE-2021-21431 being exploited?

CVE-2021-21431 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-21431 affect?

CVE-2021-21431 affects channelmgnt. Severity is high (CVSS 7.6). sopel-channelmgnt is a channelmgnt plugin for sopel. In versions prior to 2.0.1, 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 b

How urgent is CVE-2021-21431?

Priority 43/100. High severity

Related CVEs

CVE-2020-15251 HIGH 7.7 UPGRADE In the Channelmgnt plug-in for Sopel (a Python IRC bot) before version 1.0.3, malicious users are able to op/v

References

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