CVE-2020-28044
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 · uneditedAn attacker with physical access to a PAX Point Of Sale device with ProlinOS through 2.4.161.8859R can boot it in management mode, enable the XCB service, and then list, read, create, and overwrite files with MAINAPP permissions.
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 confidenceAn attacker with physical access to a PAX POS device running ProlinOS through version 2.4.161.8859R can boot the device into management mode, enable the XCB service, and then perform unrestricted file operations (list, read, create, overwrite) with elevated MAINAPP permissions, effectively achieving privilege escalation through improper service access controls.
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<= 2.4.161.8859rCVSS 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
- Physical
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/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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Identify ProlinOS version on the PAX deviceAccess the device system information or about screen, or use the device's built-in version check command if available, to determine the exact ProlinOS firmware versionAffected if The installed ProlinOS version is 2.4.161.8859r or lower
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Verify management mode accessibilityAttempt to access management mode on the PAX device (typically via a specific key sequence during boot or through a service menu) to determine if it can be entered without authenticationAffected if Management mode can be accessed without requiring additional authentication credentials
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Check if XCB service is present and can be enabledInvestigate whether the XCB service exists on the device and can be activated through management mode or other meansAffected if The XCB service is present and can be enabled without proper access controls
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Confirm elevated MAINAPP permission contextDetermine if file operations performed through the XCB service execute with MAINAPP elevated permissions rather than restricted user-level permissionsAffected if File operations through XCB run with MAINAPP elevated privileges instead of sandboxed permissions
A user is affected if their PAX POS device runs ProlinOS version 2.4.161.8859r or lower AND management mode is accessible without authentication AND the XCB service can be enabled to perform elevated file operations
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 dataRestrict physical access to POS terminals; update ProlinOS to a patched version if available; implement additional authentication controls for management mode and the XCB service.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-28044 — 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-2020-28044 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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