CVE-2021-38675
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 · uneditedA cross-site scripting (XSS) vulnerability has been reported to affect QNAP device running Image2PDF. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions of Image2PDF: Image2PDF 2.1.5 ( 2021/08/17 ) 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 · moderate confidenceA cross-site scripting (XSS) vulnerability in QNAP's Image2PDF application allows remote attackers to inject malicious code via unsanitized user input. This is a web-facing vulnerability in the Image2PDF component that could allow session hijacking or credential theft via malicious scripts executed in victim browsers.
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< 2.1.5CVSS 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
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/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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Confirm Image2PDF is installedLog in to the QNAP NAS web interface, navigate to App Center, and search for the Image2PDF application. Alternatively, use the QNAP CLI to list installed applications if available.Affected if Image2PDF appears in the list of installed applications
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Identify the installed version of Image2PDFIn the QNAP App Center, click on Image2PDF and view the version information displayed in the application details panel. If using CLI, check the application package metadata if accessible.Affected if The displayed version number is lower than 2.1.5 (for example, 2.1.4, 2.1.3, etc.)
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Verify the web-facing component is activeAttempt to access the Image2PDF web interface by navigating to the application's URL on the QNAP device (typically accessible through the QNAP dashboard or directly if the app provides its own portal).Affected if The Image2PDF web application loads and accepts user input without requiring authentication beyond standard QNAP login
A user is affected if Image2PDF is installed with a version lower than 2.1.5 and the web interface is accessible, allowing unsanitized user input to be processed.
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 · scoped2.1.5
Update Image2PDF to version 2.1.5 or later (released 2021/08/17). If immediate patching is not feasible, disable the Image2PDF application until the update can be applied.
Image2PDF 2.1.5 or later
- 1. Log in to the QNAP device and open the App Center
- 2. Locate Image2PDF in the installed applications
- 3. Check the current version number to confirm it is below 2.1.5
- 4. Update Image2PDF to version 2.1.5 or later via the App Center update function, or manually download the latest version from the official QNAP website
- 5. After updating, verify that the installed version is 2.1.5 or higher
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation2.0 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-2021-38675 — 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-2021-38675 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
- No spam, self-promotion, credentials, or personal data