CVE-2023-53739
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 · uneditedTinycontrol LAN Controller v3 LK3 version 1.58a contains an unauthenticated vulnerability that allows remote attackers to download configuration backup files containing sensitive credentials. Attackers can retrieve the lk3_settings.bin file and extract base64-encoded user and admin passwords without authentication.
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 unauthenticated file download vulnerability in Tinycontrol LAN Controller v3 LK3 v1.58a allows remote attackers to retrieve the configuration backup file (lk3_settings.bin) without any authentication. The backup file contains base64-encoded plaintext passwords for user and admin accounts, providing full credential compromise.
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
- Authentication
- X
- User interaction
- None
- Scope
- X
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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.
-
Identify the device modelAccess the device web interface or check device documentation to confirm it is a Tinycontrol LAN Controller v3 LK3Affected if The device is not a Tinycontrol LK3 controller
-
Check the firmware versionLog into the device web interface and navigate to the system or status page to view the firmware version, or use the command: cat /proc/version if SSH is availableAffected if The installed firmware version is 1.58a or other versions that may contain this vulnerability
-
Verify network exposureDetermine if the device web interface is accessible from untrusted networks by checking router/firewall rules or scanning external IP for port 80/443Affected if The device HTTP/HTTPS ports are exposed to the internet or untrusted networks without authentication barriers
-
Test backup file download endpointAttempt to access the URL pattern: http://[device-ip]/lk3_settings.bin or https://[device-ip]/lk3_settings.bin without any authentication credentialsAffected if The request returns a binary file (lk3_settings.bin) without requiring login
-
Inspect downloaded backup for credentialsIf step 4 succeeds, decode the downloaded file using base64 and search for plaintext password strings in the decoded contentAffected if The backup file contains base64-encoded plaintext passwords for admin or user accounts
A user is affected if they have a Tinycontrol LK3 device running firmware v1.58a (or vulnerable version) with the lk3_settings.bin endpoint accessible without authentication, allowing unauthenticated retrieval of credential-containing backup files.
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 dataImmediately restrict network exposure of the device and change all compromised credentials. The vendor should patch the vulnerability to require proper authentication before allowing configuration backup downloads, and users should apply any available firmware updates.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 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 $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-53739 — 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-2023-53739 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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
- No spam, self-promotion, credentials, or personal data