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Dsl 7740c FirmwareOperating system · Dlink

CVE-2020-12774

MEDIUM · 6.7 CVSS v3.1 Published 2020-07-22
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
69/100
Remediation priority · Elevated
Zero-click

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 · unedited
D-Link DSL-7740C does not properly validate user input, which allows an authenticated LAN user to inject arbitrary command.

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 confidence

Command injection vulnerability in D-Link DSL-7740C routers allows an authenticated LAN user to execute arbitrary OS commands due to improper input validation in the web management interface. The attacker must have valid credentials for the LAN-side management interface.

MitigationApply available vendor firmware update; if no update exists, consider replacing the device. Restrict LAN access to the management interface to trusted users only.

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
Dsl 7740c FirmwareOperating system
Affected:= v6.tr069.20180723

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
Local
Complexity
Low
Privileges
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:H/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 checks

Work through these to decide whether this CVE applies to you.

  1. Confirm device model is D-Link DSL-7740C
    Access the router web management interface and check the device information page, or look at the device label on the router itself
    Affected if The device is not a D-Link DSL-7740C
  2. Check installed firmware version
    Log into the web management interface and navigate to the firmware/version status page, or check via telnet/SSH if available. Compare the firmware version to 'v6.tr069.20180723'
    Affected if Firmware version is exactly v6.tr069.20180723
  3. Verify LAN-side web management interface is enabled
    Check the router web UI under 'Management' or 'Access Control' settings for LAN management access. Look for 'HTTP' or 'Web' access enabled on LAN interfaces
    Affected if LAN-side web management interface is enabled and accessible from the local network
  4. Confirm admin credentials are configured for LAN access
    Check if default or custom administrator credentials exist for the LAN management interface
    Affected if Valid credentials exist for LAN-side management access (even default credentials)

A user is affected if they have a D-Link DSL-7740C router running firmware version v6.tr069.20180723 with the LAN-side web management interface enabled and configured with valid credentials.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply available vendor firmware update; if no update exists, consider replacing the device. Restrict LAN access to the management interface to trusted users only.

Fix this in Dsl 7740c Firmware Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing1.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,090
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2020-12774 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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