CVE-2025-8021
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 · uneditedAll versions of the package files-bucket-server are vulnerable to Directory Traversal where an attacker can traverse the file system and access files outside of the intended directory.
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 confidenceThe files-bucket-server package versions contain a directory traversal vulnerability that allows attackers to use path traversal sequences (such as ../) to escape the intended bucket/directory and access files outside the designated storage area.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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:3.1/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 checksWork through these to decide whether this CVE applies to you.
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Identify if files-bucket-server package is installedCheck package.json dependencies, node_modules, or run 'npm list files-bucket-server' / 'pip list' depending on package manager usedAffected if The package is present in the project dependencies or installed on the system
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Determine the installed version of files-bucket-serverRun package manager command to show installed version: npm list files-bucket-server --depth=0 or pip show files-bucket-serverAffected if The version number returned is lower than the patched version (compare against vendor release notes for CVE-2025-8021)
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Verify if the bucket server service is running or exposedCheck running processes for bucket-server, or inspect application configuration for enabled endpoints that serve files from bucketsAffected if The bucket server is actively running or accessible via network API
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Check if file serving functionality is in useReview application logs or code that utilizes the files-bucket-server file access APIs, look for requests to bucket endpointsAffected if The application exposes endpoints that accept file path parameters and serve files from bucket storage
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Inspect access controls on bucket storage configurationExamine configuration files for bucket root path settings and whether any web server or application-level restrictions are in placeAffected if The bucket storage is directly exposed without proper path validation or sandboxing
You are affected if files-bucket-server is installed with a vulnerable version AND the file serving functionality is enabled and accessible to users who could supply path traversal sequences.
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 strict path validation ensuring all file paths resolve within the intended directory boundary, reject paths containing traversal sequences, and use sandboxing or chroot techniques to isolate file operations.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-8021 — 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-2025-8021 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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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.
- 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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