CVE-2020-2495
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 · uneditedIf exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code in File Station. QANP have already fixed these vulnerabilities in the following versions of QTS and QuTS hero. QuTS hero h4.5.1.1472 build 20201031 and later QTS 4.5.1.1456 build 20201015 and later QTS 4.4.3.1354 build 20200702 and later QTS 4.3.6.1333 build 20200608 and later QTS 4.3.4.1368 build 20200703 and later QTS 4.3.3.1315 build 20200611 and later QTS 4.2.6 build 20200611 and later
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 confidenceThis is a cross-site scripting (XSS) vulnerability in QNAP's File Station application. If exploited, remote attackers can inject malicious scripts into the web interface, potentially compromising user sessions or performing actions on behalf of authenticated users.
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< 4.5.1.1472< 4.5.1.1456< 4.4.3.1354< 4.3.6.1333< 4.3.4.1368< 4.3.3.1315< 4.2.6CVSS 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
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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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Check your QTS or QuTS hero firmware versionLog into the QNAP admin web interface and view the System Dashboard, or access the NAS via SSH and run the command to display the firmware version (typically found in system information or /etc/config)Affected if The firmware version falls into any of these ranges: QuTS Hero < 4.5.1.1472, QTS < 4.5.1.1456, QTS < 4.4.3.1354, QTS < 4.3.6.1333, QTS < 4.3.4.1368, QTS < 4.3.3.1315, or QTS < 4.2.6
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Confirm File Station is accessibleVerify that the File Station web application is enabled and accessible on your QNAP device (typically at https://[your-nas]/fs/ or via the main admin interface under Applications > File Station)Affected if File Station is enabled and accessible on the web interface, and your firmware version is within the affected ranges listed above
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Check File Station application versionWithin the File Station web interface, access the settings or about section to view the File Station application versionAffected if The File Station version cannot be separately verified from firmware; the CVE is addressed through firmware updates alone, so the firmware version check in step 1 is the definitive detection method
You are affected if your QNAP device runs QTS or QuTS hero firmware versions lower than the fixed builds AND has File Station web interface enabled.
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 data4.2.64.3.3.13154.3.4.1368
Update QTS or QuTS hero to one of the fixed versions (QTS 4.5.1.1456 build 20201015 or later, or QuTS hero h4.5.1.1472 build 20201031 or later, or the specific older builds listed) to remediate this vulnerability.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-2495 — 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-2020-2495 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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