CVE-2024-28833
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedImproper restriction of excessive authentication attempts with two factor authentication methods in Checkmk 2.3 before 2.3.0p6 facilitates brute-forcing of second factor mechanisms.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceCheckmk versions 2.3 before 2.3.0p6 fail to properly restrict excessive authentication attempts when using two-factor authentication methods. This improper restriction allows attackers to repeatedly attempt to brute-force second-factor codes (such as TOTP, SMS, or email codes) without account lockout or rate limiting, significantly reducing the effort needed to compromise 2FA-protected accounts.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 2.3.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Determine installed Checkmk versionRun 'cmk --version' from the command line, or log into the Checkmk web interface and navigate to Setup > About Checkmk to view the version numberAffected if The version is 2.3.0 through 2.3.0p5 (any version before 2.3.0p6)
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Verify if two-factor authentication is enabledLog into Checkmk as an administrative user, go to Setup > Users > User Settings, or check the ~/var/check_mk/states directory for 2FA configuration files. Alternatively, examine the etc/check_mk/multisite.d/wato/users.mk configuration file for 2FA-related settings such as '2fa_enabled', 'totp', 'sms', or 'email' authentication methodsAffected if Any 2FA method (TOTP, SMS, or email verification) is configured for user accounts
You are affected if your Checkmk installation runs version 2.3.0 through 2.3.0p5 AND has two-factor authentication enabled for any user account, because the lack of rate limiting on 2FA attempts can allow brute-force attacks.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedUpgrade Checkmk to version 2.3.0p6 or later which implements proper rate limiting and restrictions on 2FA authentication attempts. If immediate upgrading is not possible, consider restricting network access to the login interface via firewall rules or VPN as a temporary compensating control.
2.3.0p6
- Verify current Checkmk version using 'cmk --version' or through the web interface
- Backup the Checkmk configuration and data directory before upgrading
- Download Checkmk version 2.3.0p6 from the official Checkmk download page (checkmk.com)
- Stop the Checkmk site using 'cmk -O <sitename>' or the web interface shutdown option
- Install the upgrade package using the appropriate method for your installation (deb, rpm, or source)
- Start the Checkmk site and verify the upgrade was successful
- Log in and verify that 2FA is now properly protected with rate limiting
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation3.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-28833 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-28833 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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