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M Files ServerApplication · M Files

CVE-2021-41807

CRITICAL · 9.8 CVSS v3.1 Published 2022-01-18
Fix available
A fix is available. Upgrade to 21.12.10873.0 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
Lack of rate limiting in M-Files Server and M-Files Web products with versions before 21.12.10873.0 in certain type of user accounts allows unlimited amount of attempts and therefore makes brute-forcing login accounts easier.

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 confidence

M-Files Server and M-Files Web versions prior to 21.12.10873.0 lack rate limiting on authentication for certain user account types, allowing unlimited login attempts and enabling trivial brute-force attacks against user credentials.

MitigationUpgrade M-Files to version 21.12.10873.0 or later. Until then, implement network-level rate limiting or account lockout policies as compensating controls.

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
M Files ServerApplication
Affected:< 21.12.10873.0
M Files WebApplication
Affected:< 21.12.10873.0

CVSS 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
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify M-Files Server installation
    Locate the M-Files Server component on the system by checking for the M-Files service, examining program directories, or querying installed programs
    Affected if M-Files Server is present and its version is below 21.12.10873.0
  2. Identify M-Files Web installation
    Locate the M-Files Web component by checking IIS for M-Files web applications or examining web server directories for M-Files Web files
    Affected if M-Files Web is present and its version is below 21.12.10873.0
  3. Check M-Files Server version
    Access the M-Files Admin tool and view the server version information, or check the version details in the M-Files Server installation directory
    Affected if Installed version is lower than 21.12.10873.0
  4. Check M-Files Web version
    Access version information through the M-Files Admin tool for web components, or examine version details in the M-Files Web installation directory
    Affected if Installed version is lower than 21.12.10873.0

Your environment is affected if either M-Files Server or M-Files Web is installed with a version number less than 21.12.10873.0, as these versions lack rate limiting on authentication and are vulnerable to brute-force attacks.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 21.12.10873.0 or later
Fixed in 21.12.10873.0
Interim mitigation

Upgrade M-Files to version 21.12.10873.0 or later. Until then, implement network-level rate limiting or account lockout policies as compensating controls.

Recommended fix High confidence

21.12.10873.0

  1. Contact M-Files support or visit the official M-Files portal (www.m-files.com or empower.m-files.com) to obtain the version 21.12.10873.0 upgrade package
  2. Review M-Files upgrade documentation for your specific deployment type (Server and/or Web)
  3. Schedule a maintenance window appropriate for a production system upgrade
  4. Backup your current M-Files configuration and database before proceeding
  5. Deploy version 21.12.10873.0 or later to M-Files Server
  6. Deploy version 21.12.10873.0 or later to M-Files Web if deployed
  7. Verify the upgrade completed successfully and test authentication functionality
  8. Confirm rate limiting is now enforced on login attempts

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in M Files Server Scoped from the published advisory
  • Consultation1.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,040
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,664.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-41807 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data