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Diskstation ManagerOperating system · Synology

CVE-2017-9553

HIGH · 7.5 CVSS v3.0 Published 2017-07-24
Fix available
A fix is available. Upgrade to after 6.1.1-15101-4 or later.
See remediation →
84/100
Remediation priority · High
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
A design flaw in SYNO.API.Encryption in Synology DiskStation Manager (DSM) before 6.1.3-15152 allows remote attackers to bypass the encryption protection mechanism via the crafted version parameter.

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

A design flaw in SYNO.API.Encryption in Synology DiskStation Manager (DSM) allows remote attackers to bypass the encryption protection mechanism by supplying a crafted version parameter. This enables attackers to potentially access encrypted data without proper authentication.

MitigationUpgrade DSM to version 6.1.3-15152 or later to remediate this encryption bypass vulnerability.

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:<= 6.1.1-15101-4

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
None
Availability
None

CVSS:3.0/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 checks

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

  1. Check installed DSM version
    Log into DSM and go to Control Panel > System > System Information, or run 'grep -i 'productversion' /etc/VERSION' via SSH
    Affected if The version is 6.1.1-15101-4 or lower
  2. Verify SYNO.API.Encryption endpoint exists
    Check if the API handler exists on the system by searching for 'SYNO.API.Encryption' in the DSM web interface files or API definitions (typically in /usr/syno/synoman/webapi/)
    Affected if The API module file is present on the system
  3. Identify encrypted storage configuration
    Check for encrypted shared folders or encrypted volumes in DSM: go to Control Panel > Shared Folder, or run 'ls -la /volume*/@encrypt*' via SSH to locate encrypted resources
    Affected if Encrypted shared folders or encrypted volumes are configured and accessible via the affected API
  4. Confirm API is remotely accessible
    Test if the SYNO.API.Encryption endpoint responds by making a request to 'webapi/entry.cgi?api=SYNO.API.Encryption&version=1' on the DSM host
    Affected if The API endpoint is reachable from the network without authentication bypass

A user is affected if their DSM version is 6.1.1-15101-4 or lower AND they have encrypted shared folders or volumes accessible via the SYNO.API.Encryption interface.

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.

From vendor data
Upgrade available Upgrade to a release after 6.1.1-15101-4
Interim mitigation

Upgrade DSM to version 6.1.3-15152 or later to remediate this encryption bypass vulnerability.

Fix this in Diskstation Manager Scoped from the published advisory
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing8.0 h
  • Review / QA4.0 h
30.0 hours of engineering $5,280
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,448.

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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-2017-9553 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