CVE-2021-29084
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 in output used by a downstream component ('Injection') vulnerability in Security Advisor report management component in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows remote attackers to read arbitrary files 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 confidenceAn injection vulnerability in the Security Advisor report management component of Synology DSM allows remote attackers to read arbitrary files on the system. The vulnerability stems from improper neutralization of special elements in output, likely a path traversal issue, enabling unauthorized file access.
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, < 6.2.3-25426-3< 3.1-23033CVSS 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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Identify DSM version installedLog into DSM and go to Control Panel > System > System Information, or run command: cat /etc/VERSION on the deviceAffected if Version is 6.2 or higher but lower than 6.2.3-25426-3
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Identify Unified Controller version if applicableFor unified controller installations, check the version via Control Panel > DSM Update or run: cat /etc/VERSIONAffected if Version is lower than 3.1-23033
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Verify Security Advisor service statusIn DSM, go to Control Panel > Security Advisor > Overview to confirm the service is runningAffected if Security Advisor is enabled and running on a version within the affected range
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Assess network exposure of management interfaceCheck if the DSM web interface (ports 5000/5001) or VPN is exposed directly to untrusted networksAffected if Management interface is accessible from external/untrusted networks and DSM version is vulnerable
Environment is affected if running DSM version 6.2 through 6.2.3-25426-2 (or Unified Controller below 3.1-23033) with Security Advisor enabled and the management interface network-accessible.
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.
From vendor data3.1-230336.2.3-25426-3
Upgrade Synology DSM to version 6.2.3-25426-3 or later to remediate this vulnerability. If immediate patching is not possible, consider restricting network access to the management interface and monitoring for suspicious file access patterns.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2021-29084 — 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-2021-29084 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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