CVE-2020-8503
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 · uneditedBiscom Secure File Transfer (SFT) 5.0.1050 through 5.1.1067 and 6.0.1000 through 6.0.1003 allows Insecure Direct Object Reference (IDOR) by an authenticated sender because of an error in a file-upload feature. This is fixed in 5.1.1068 and 6.0.1004.
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 confidenceBiscom Secure File Transfer contains an Insecure Direct Object Reference (IDOR) vulnerability in its file-upload feature. An authenticated sender can exploit improper validation of object references to access or manipulate files outside their intended scope. The vulnerability affects versions 5.0.1050-5.1.1067 and 6.0.1000-6.0.1003.
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>= 5.0.1050, <= 5.1.1067>= 6.0.1000, <= 6.0.1003CVSS 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
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/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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Confirm Biscom Secure File Transfer installationLocate the application through your system inventory, service list, or installation directory. Check for processes or services named 'Biscom SFT' or similar.Affected if The product is not present on the system, then this CVE does not apply.
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Identify installed version numberAccess the administration interface, check the software metadata, or query the application for its version information. This is typically found in the About section, logs, or a version file within the installation directory.Affected if The installed version cannot be determined, assume it may be affected and continue to verification steps.
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Compare version against affected rangesMatch the identified version against the affected ranges: 5.0.1050 through 5.1.1067, or 6.0.1000 through 6.0.1003. Any version within these inclusive ranges is vulnerable.Affected if The installed version falls within 5.0.1050-5.1.1067 or 6.0.1000-6.0.1003.
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Verify file-upload feature is accessibleConfirm that the file-upload functionality is enabled and accessible to authenticated users in the deployment. Check application configuration or user role permissions.Affected if The file-upload feature is disabled or not accessible to any users, the IDOR vulnerability cannot be exploited.
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Confirm authentication is configuredEnsure user authentication is enabled for the application. Check that sender accounts can be created and authenticated to access the file-upload feature.Affected if Authentication is disabled and no sender accounts exist, the vulnerability cannot be triggered since it requires an authenticated sender.
A user is affected if Biscom Secure File Transfer is installed with a version between 5.0.1050-5.1.1067 or 6.0.1000-6.0.1003, and the file-upload feature is accessible to authenticated senders.
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 dataApply vendor patches by upgrading to version 5.1.1068 or 6.0.1004 (or later), which contain the fix for this IDOR vulnerability.
- Consultation2.0 h
- Implementation3.0 h
- Testing3.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-8503 — 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-2020-8503 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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