dbcve.org
Diskstation ManagerOperating system · Synology

CVE-2021-43929

MEDIUM · 5.4 CVSS v3.1 Published 2022-02-07
Fix available
A fix is available. Upgrade to 6.2.4-25556-3 / 7.0.1-42218-2 or later.
See remediation →
58/100
Remediation priority · Elevated
Remotely reachable

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
Improper neutralization of special elements in output used by a downstream component ('Injection') vulnerability in work flow management in Synology DiskStation Manager (DSM) before 7.0.1-42218-2 allows remote authenticated users to inject arbitrary web script or HTML via unspecified vectors.

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

This is a cross-site scripting (XSS) vulnerability in the workflow management component of Synology DiskStation Manager (DSM). Remote authenticated users can inject arbitrary web script or HTML due to improper neutralization of special elements in output before being displayed to other users.

MitigationUpgrade DSM to version 7.0.1-42218-2 or later. Until patched, limit access to the workflow management interface to only trusted administrative users.

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
Diskstation ManagerOperating system
Affected:>= 6.2, < 6.2.4-25556-3>= 7.0, < 7.0.1-42218-2

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
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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 checks

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

  1. Identify DSM version
    Log into the Synology DiskStation Manager web interface and navigate to Control Panel > System > System Information, or run `cat /etc/VERSION` via SSH to obtain the exact DSM build number and version string.
    Affected if The installed version is 6.2.x but lower than 6.2.4-25556-3, OR version 7.0.x but lower than 7.0.1-42218-2.
  2. Confirm workflow management module is accessible
    In DSM, navigate to the main menu and check if the 'Workflow' or 'WorkFlow' application icon is present and accessible from the user interface.
    Affected if The workflow management component is installed and accessible to users.
  3. Verify user authentication configuration
    Check Control Panel > User & Group to review which users have access to the DSM interface and specifically which users have permissions to use the workflow management feature.
    Affected if More than one user account exists with access to the DSM interface or workflow management, creating a scenario where injected scripts could affect other users viewing the same content.
  4. Check browser console for existing XSS evidence
    If you have access to the workflow management interface, open the browser developer console (F12) and look for any error messages related to script execution or unusual warnings when navigating the workflow pages.
    Affected if Unexpected script execution errors appear in the console when interacting with workflow management pages.

A system is affected if it runs DSM version 6.2 through 6.2.4-25556-2 OR DSM version 7.0 through 7.0.1-42218-1, AND the workflow management component is accessible to authenticated users.

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 6.2.4-25556-3 / 7.0.1-42218-2 or later
Fixed in 6.2.4-25556-37.0.1-42218-2
Interim mitigation

Upgrade DSM to version 7.0.1-42218-2 or later. Until patched, limit access to the workflow management interface to only trusted administrative users.

Recommended fix High confidence

DSM 6.2.4-25556-3 or DSM 7.0.1-42218-2 (depending on major version in use)

  1. 1. Identify the current DSM version in use (DSM 6.2 or DSM 7.0)
  2. 2. For DSM 6.2: Upgrade to version 6.2.4-25556-3 or later
  3. 3. For DSM 7.0: Upgrade to version 7.0.1-42218-2 or later
  4. 4. Download the update from the Synology Download Center or use the built-in DSM update feature
  5. 5. Apply the update following Synology's standard DSM update procedure
  6. 6. Verify the update was successful and the system is functioning normally

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

Fix this in Diskstation Manager Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing4.0 h
  • Review / QA2.0 h
13.0 hours of engineering $2,280
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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-2021-43929 in production — separate from our analysis above.

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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