dbcve.org
Diskstation ManagerOperating system · Synology

CVE-2021-43925

CRITICAL · 9.8 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 →
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
Improper neutralization of special elements used in an SQL command ('SQL Injection') vulnerability in Log Management functionality in Synology DiskStation Manager (DSM) before 7.0.1-42218-2 allows remote attackers to inject SQL commands 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

SQL injection vulnerability in the Log Management functionality of Synology DiskStation Manager (DSM) allows remote attackers to inject arbitrary SQL commands. The vulnerability exists in versions prior to 7.0.1-42218-2 and can be exploited without authentication due to improper input validation of user-supplied data in SQL queries.

MitigationUpdate Synology DSM to version 7.0.1-42218-2 or later. If immediate patching is not possible, consider network segmentation to limit exposure to untrusted networks.

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
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. Determine the installed DSM version
    Log into the Synology DiskStation Manager web interface and navigate to Control Panel > System > General > Version. Alternatively, run the command: cat /etc/VERSION on the device via SSH.
    Affected if The displayed version falls within the vulnerable ranges: 6.2 up to but not including 6.2.4-25556-3, or 7.0 up to but not including 7.0.1-42218-2.
  2. Confirm DSM major version
    Review the version number identified in the previous step. DSM 6.x versions start with 6.2, while DSM 7.x versions start with 7.0 or 7.1.
    Affected if The major version is 6.2.x or 7.0.x, indicating the software branch that contains the vulnerable code.
  3. Identify Log Management service exposure
    Access the Synology web interface and locate the Log Management or Log Center application. Determine if the service is reachable over the network by attempting to access the log query interface from an external host, or by reviewing the firewall/port settings in Control Panel > Security > Firewall.
    Affected if The Log Management service is accessible from network interfaces that are exposed to untrusted networks, as the vulnerability can be exploited without authentication.
  4. Verify remote access settings
    Review the DSM accessibility settings in Control Panel > Network > Network Settings > HTTP/HTTPS ports. Check if the DSM web interface is bound to external interfaces rather than only localhost.
    Affected if DSM is configured to allow remote HTTP/HTTPS access from untrusted networks, enabling the unauthenticated SQL injection to be exploited remotely.

The system is affected if it runs DSM version 6.2 through 6.2.4-25556-3 (exclusive) or DSM 7.0 through 7.0.1-42218-2 (exclusive) and has the Log Management interface accessible over the network.

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

Update Synology DSM to version 7.0.1-42218-2 or later. If immediate patching is not possible, consider network segmentation to limit exposure to untrusted networks.

Recommended fix High confidence

DSM 6.2.4-25556-3 (for DSM 6.2.x) or DSM 7.0.1-42218-2 (for DSM 7.0.x)

  1. 1. Back up all critical data on the NAS before starting the update process
  2. 2. Log into Synology DiskStation Manager as an administrator
  3. 3. Navigate to Control Panel > Update & Restore > DSM Update
  4. 4. Check the current DSM version in the System Overview to confirm it is an affected version
  5. 5. Click 'Download Update' to fetch the latest available update from Synology
  6. 6. If the specific version (6.2.4-25556-3 for DSM 6.2 or 7.0.1-42218-2 for DSM 7.0) is not offered automatically, manually download it from the Synology Download Center at https://www.synology.com/support/download
  7. 7. Go to Control Panel > Update & Restore > Manual DSM Update and select the downloaded .pat file
  8. 8. Follow the on-screen prompts to install the update
Caveat Standard Synology DSM updates are generally non-breaking; always backup data before updating

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

Fix this in Diskstation Manager Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,090
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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-2021-43925 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