CVE-2018-20439
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 · uneditedTechnicolor DPC3928SL D3928SL-PSIP-13-A010-c3420r55105-170214a devices allow remote attackers to discover Wi-Fi credentials via iso.3.6.1.4.1.4413.2.2.2.1.5.4.1.14.1.3.10001 and 1.3.6.1.4.1.4413.2.2.2.1.18.1.2.3.4.1.2.10001 SNMP requests.
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 confidenceThe Technicolor DPC3928SL DSL gateway exposes Wi-Fi credentials (SSID and password) through unauthenticated SNMP queries via two specific OIDs. An attacker can remotely retrieve the wireless network name and password without any authentication, gaining full access to the Wi-Fi network.
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= d3928sl-psip-13-a010-c3420r55105-170214aCVSS 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 device modelCheck if the target device is a Technicolor DPC3928SL DSL gateway by querying the device's SNMP system description OID (1.3.6.1.2.1.1.1.0) or accessing the device's web interfaceAffected if Device is not a Technicolor DPC3928SL, then not affected by this specific CVE
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Check firmware versionQuery the device firmware version via SNMP or web interface. The specific OID for firmware version may vary; check 1.3.6.1.2.1.1.2.0 for sysObjectID or consult device documentation for version OID. Compare against 'd3928sl-psip-13-a010-c3420r55105-170214a'Affected if Firmware version exactly matches d3928sl-psip-13-a010-c3420r55105-170214a, then likely affected
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Verify SNMP service is accessibleAttempt an SNMP walk or query against the device on the standard SNMP port (161/UDP). Use a tool like snmpwalk with a community string (public is default): snmpwalk -v2c -c public <device_ip>Affected if SNMP service is not accessible or not responding, then not vulnerable to this specific attack vector
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Query Wi-Fi credential OIDsIf SNMP is accessible, attempt to query the two specific OIDs that expose Wi-Fi credentials. The exact OIDs are not specified in the CVE summary; if known OIDs for SSID/password are available in device documentation, query them without authenticationAffected if SNMP query returns Wi-Fi SSID and/or password without authentication, then the device is affected and credentials are exposed
Device is affected if it is a Technicolor DPC3928SL running firmware version d3928sl-psip-13-a010-c3420r55105-170214a with SNMP service accessible and responding to unauthenticated queries that reveal Wi-Fi credentials.
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 firmware update if available, otherwise disable SNMP service or restrict SNMP access to management interfaces only, and change default SNMP community strings.
- Consultation4.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-20439 — 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-2018-20439 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
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