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Media ServerApplication · Synology

CVE-2021-33180

CRITICAL · 9.8 CVSS v3.1 Published 2021-06-01
Fix available
A fix is available. Upgrade to 1.8.1-2876 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 cgi component in Synology Media Server before 1.8.1-2876 allows remote attackers to execute arbitrary 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 CGI component of Synology Media Server allows remote attackers to execute arbitrary SQL commands without authentication. The vulnerability exists in versions prior to 1.8.1-2876 and stems from improper neutralization of special elements in SQL commands.

MitigationUpdate Synology Media Server to version 1.8.1-2876 or later to remediate this vulnerability. If immediate patching is not possible, consider network segmentation or disabling the media server's CGI interface as a temporary measure.

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
Media ServerApplication
Affected:< 1.8.1-2876

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. Confirm Synology Media Server is installed
    Locate the Synology Media Server package on the system, typically found via the Synology Package Center or by checking for the media server binary/process (often named 'mediaserver' or similar)
    Affected if The software is not present on the system, the vulnerability does not apply
  2. Identify the installed version
    Check the installed Synology Media Server version through the Synology Package Center interface, or via command line using 'cat /var/packages/MediaServer/INFO' or similar package management tooling
    Affected if The installed version is lower than 1.8.1-2876 (e.g., 1.8.0-xxxx or any version prior to 1.8.1-2876)
  3. Verify the CGI component is enabled
    Inspect the Synology Media Server configuration to determine if the CGI interface is enabled; this is typically found in the web interface settings or configuration files under /etc or /var directories related to Media Server
    Affected if The CGI component is enabled and accessible, making the SQL injection exploitable
  4. Confirm network exposure of the CGI interface
    Check if the Synology web interface (port 5000/5001 or the media server web portal) is exposed to untrusted networks; review firewall rules and router port forwarding settings
    Affected if The CGI interface is reachable from remote/untrusted networks, allowing external attackers to exploit the SQL injection without authentication

The system is affected if Synology Media Server is installed with a version lower than 1.8.1-2876 and the CGI component is enabled and network-accessible to untrusted parties.

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 1.8.1-2876 or later
Fixed in 1.8.1-2876
Interim mitigation

Update Synology Media Server to version 1.8.1-2876 or later to remediate this vulnerability. If immediate patching is not possible, consider network segmentation or disabling the media server's CGI interface as a temporary measure.

Recommended fix High confidence

Media Server version 1.8.1-2876 or later

  1. Log into the Synology NAS with administrator privileges
  2. Open Package Center or navigate to the Media Server package settings
  3. Check the current version of Media Server installed
  4. Update Media Server to version 1.8.1-2876 or later through the package manager
  5. Verify the update was successful by checking the updated version number

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

Fix this in Media Server Scoped from the published advisory
  • Consultation1.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
5.0 hours of engineering $860
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,376.

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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-2021-33180 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