CVE-2023-3841
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 vulnerability has been found in NxFilter 4.3.2.5 and classified as problematic. This vulnerability affects unknown code of the file user.jsp. The manipulation leads to cross-site request forgery. The attack can be initiated remotely. The identifier of this vulnerability is VDB-235192. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.
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 confidenceA cross-site request forgery (CSRF) vulnerability exists in NxFilter 4.3.2.5 within the user.jsp file. The application fails to validate anti-CSRF tokens or verify the Origin/Referer headers on state-changing operations in the user management functionality, allowing remote attackers to trick authenticated administrators into executing unintended actions such as creating, modifying, or deleting user accounts.
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= 4.3.2.5CVSS 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
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 checksWork through these to decide whether this CVE applies to you.
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Confirm NxFilter versionLocate the NxFilter installation directory and check the version file or About page. Common locations: /opt/nxfilter/ or C:\NxFilter\. Look for a version.txt, about page in web UI, or check the WAR file metadata.Affected if The installed version is exactly 4.3.2.5
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Verify user.jsp is accessibleCheck if the user.jsp file exists in the web application root. This is typically found at /user.jsp or within the /WEB-INF/ or /jsp/ directory of the NxFilter web application.Affected if The user.jsp file exists and is accessible via the web interface on the target NxFilter instance
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Inspect user management forms for CSRF tokensLog into the NxFilter admin interface, navigate to User Management, and view the page source (right-click > View Page Source) of the user creation/modification forms. Look for hidden input fields containing tokens named like 'csrf', 'token', 'nonce', or similar anti-CSRF mechanisms.Affected if No hidden CSRF token fields are present in the user management forms, indicating tokens are not implemented
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Test for Origin/Referer header validationSubmit a state-changing user management request (create/modify/delete user) using a crafted request without a valid Origin or Referer header, or with an arbitrary Origin like 'http://evil.com'. Use browser dev tools or a tool like curl to intercept and modify headers.Affected if The request succeeds without requiring a valid Origin or Referer header, meaning the server does not validate these headers
If NxFilter version 4.3.2.5 is installed AND the user.jsp page is accessible without CSRF token validation and without Origin/Referer header checks, the environment is affected by this CSRF vulnerability.
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 dataImplement the Synchronizer Token Pattern by adding unique CSRF tokens to all forms in user.jsp and validating these tokens server-side on submission. Additionally, configure SameSite cookie attributes and validate Origin/Referer headers as defense-in-depth measures.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2023-3841 — 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-2023-3841 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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- Version or environment caveats, and links to real fixes
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