CVE-2021-43927
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 neutralization of special elements used in an SQL command ('SQL Injection') vulnerability in Security 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 · moderate confidenceSQL injection vulnerability in Synology DiskStation Manager's Security Management functionality allows remote attackers to inject arbitrary SQL commands. The vulnerability affects DSM versions prior to 7.0.1-42218-2 and can be exploited without authentication due to improper input validation in SQL queries.
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>= 6.2, < 6.2.4-25556-3>= 7.0, < 7.0.1-42218-2CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Identify DSM versionLog into DSM web interface and go to Control Panel > Security > Security Status, or run command: cat /etc/VERSION on the device to see the exact version and build numberAffected if The version is 6.2.x with build number below 25556-3, or 7.0.x with build number below 42218-2
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Confirm Security Management accessibilityVerify the Security Management module (Control Panel > Security or the security.php endpoint) is reachable on the networkAffected if The Security Management interface is exposed and accessible to remote attackers
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Check network exposureReview firewall rules and network configuration to determine if DSM management ports (5000, 5001, or web portal) are accessible from untrusted networksAffected if The DSM management interface is directly exposed to the internet or untrusted networks without access restrictions
You are affected if your DSM version falls below 6.2.4-25556-3 or 7.0.1-42218-2 AND the DSM management interface is network-accessible to potential attackers.
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 · scoped6.2.4-25556-37.0.1-42218-2
Apply Synology DSM update 7.0.1-42218-2 or later to patch the SQL injection vulnerability. As an interim measure, restrict network access to the DSM management interface and deploy WAF/IPS rules to detect and block SQL injection attempts.
DSM 6.2.4-25556-3 or DSM 7.0.1-42218-2
- Back up all critical data on your Synology NAS before proceeding with the update
- Log into DiskStation Manager as an administrator
- Navigate to Control Panel > Update & Restore > DSM Update
- Select the option to check for updates or manually download the update from Synology's download center
- For DSM 6.2.x users: Update to version 6.2.4-25556-3
- For DSM 7.0.x users: Update to version 7.0.1-42218-2
- Allow the update to complete and verify the system restarts successfully
- Confirm the installed DSM version matches the target fixed version
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2021-43927 — 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-2021-43927 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
- No weaponised exploit code, or anything meant to cause harm
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