CVE-2018-12925
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 · uneditedBaseon Lantronix MSS devices do not require a password for TELNET access.
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 confidenceBaseon Lantronix MSS (Managed Switch Suite) devices have a critical authentication bypass vulnerability where TELNET access is configured without requiring any password. This allows unauthenticated remote attackers to gain interactive command-line access to the device over port 23.
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 dataall versionsCVSS 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
- High
- Availability
- High
CVSS:3.0/AV:N/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 Lantronix MSS deviceCheck device model and firmware version via SNMP, web interface, or console banner. Look for 'MSS', 'Managed Switch Suite', or Lantronix branding in device inventory or management interface.Affected if Device is a Lantronix MSS (Managed Switch Suite) product running any firmware version.
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Verify TELNET service is enabledScan the device for open port 23 using nmap -p 23 <device-ip> or netstat/ss -tnlp on the device itself if accessible. Check device configuration for telnet-service enable statements.Affected if Port 23 is open and accepting connections on the target device.
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Confirm TELNET authentication bypassConnect to the device via telnet <device-ip> and attempt to log in. Observe whether access is granted without providing any password, or with an empty/blank password field. Check if the session provides immediate shell access.Affected if TELNET login succeeds with no password, blank password, or without prompting for credentials.
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Review device access configurationIf administrative access is available, review the device configuration for telnet authentication settings. Look for authentication disabled, no password configured, or telnet-access without authentication requirements in the running config.Affected if TELNET access is configured with no authentication or blank password settings.
The environment is affected if a Lantronix MSS device has TELNET port 23 open and accessible without requiring any password for login.
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 disable TELNET access on affected devices and enforce SSH with strong authentication. If TELNET is required for legacy systems, restrict access to specific IP addresses via ACLs or place devices behind a jump host with additional controls.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-12925 — 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-2018-12925 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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