CVE-2025-31979
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 File Upload Validation Bypass vulnerability has been identified in the HCL BigFix SM, where the application fails to properly enforce file type restrictions during the upload process. An attacker may exploit this flaw to upload malicious or unauthorized files, such as scripts, executables, or web shells, by bypassing client-side or server-side validation mechanisms.
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 confidenceHCL BigFix SM fails to properly enforce file type restrictions during the upload process, allowing attackers to bypass client-side or server-side validation mechanisms. This enables upload of malicious files including scripts, executables, and web shells.
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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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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Identify HCL BigFix SM installation versionLocate the BigFix SM installation directory and check version files (typically in the installation root or about dialog within the application). Compare the installed version against any available version information.Affected if The installed version is older than the patched version for CVE-2025-31979 or cannot be confirmed as patched.
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Determine if the File Upload feature is enabledCheck the BigFix SM configuration files (typically sm.cfg, web.xml, or the web tier configuration) for upload-related settings. Look for uploadEnabled, maxUploadSize, or similar parameters.Affected if File upload functionality is enabled in the configuration.
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Review server-side file type validation settingsExamine the web tier configuration or upload servlet settings for allowedFileTypes, fileTypeWhitelist, or content-type validation rules. Check if deny-all/allow-list is implemented.Affected if Server-side validation relies solely on client-side checks, MIME types, or file extensions without content/magic byte verification.
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Inspect uploaded files directory for suspicious contentLocate the upload directory (commonly uploads, attachments, or temp directories in the BigFix SM data folder). List files and check for executable extensions (.exe, .bat, .sh, .jsp, .php, .asp, .ps1) or script files.Affected if Executable files, scripts, or web shells are present in upload directories.
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Check file permission settings on upload directoryReview filesystem permissions on the upload directory. Verify if uploaded files retain executable permissions or can be executed directly from the upload location.Affected if Uploaded files can be executed directly or retain executable permissions.
A user is affected if HCL BigFix SM has file upload enabled and lacks proper server-side content validation using deny-all/allow-list with magic byte verification.
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 server-side file type validation using a deny-all/allow-list approach, verify file content/magic bytes rather than just extensions or MIME types, and restrict executable permissions on uploaded files.
- 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-2025-31979 — 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-2025-31979 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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