dbcve.org
Dir 820lw FirmwareOperating system · Dlink

CVE-2024-41610

CRITICAL · 9.8 CVSS v3.1 Published 2024-07-30
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges 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 DIR-820LW REVB FIRMWARE PATCH 2.03.B01_TC contains hardcoded credentials in the Telnet service, enabling attackers to log in remotely to the Telnet service and perform arbitrary commands.

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

The D-Link DIR-820LW router firmware contains hardcoded credentials embedded in the Telnet service. An attacker with network access to the Telnet port can authenticate using these credentials and execute arbitrary commands with elevated privileges on the device.

MitigationUpdate to a patched firmware version that removes the hardcoded credentials, or if unavailable, disable the Telnet service entirely and implement network segmentation to prevent unauthorized access.

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
Dir 820lw FirmwareOperating system
Affected:= 2.03

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
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/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 checks

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

  1. Identify the device model
    Access the router web interface or check the device label to confirm the exact model number is DIR-820LW
    Affected if The device is not a D-Link DIR-820LW router, then this specific CVE does not apply
  2. Check the firmware version
    Log into the router web interface and navigate to the Status or System section to view the firmware version, or use the command line and run 'cat /proc/version' or check /etc/version if accessible
    Affected if The firmware version is 2.03, indicating it matches the affected version range
  3. Verify if Telnet service is enabled
    Check if port 23 is open and listening on the router by running a port scan (e.g., 'nmap -p 23 <router-ip>') or by examining the router's running services through its admin interface
    Affected if Telnet service is running and port 23 is accessible on the device, making the hardcoded credentials exploitable over the network
  4. Inspect for hardcoded credentials in Telnet configuration
    If you have firmware access (via JTAG, serial, or firmware extraction), examine the binary or configuration files for embedded credentials used by the Telnet service
    Affected if Hardcoded credentials are present in the Telnet service configuration, confirming the device is vulnerable to unauthenticated command execution

A defender is affected if they have a D-Link DIR-820LW router running firmware version 2.03 with the Telnet service enabled and accessible, which contains hardcoded credentials allowing unauthenticated command execution.

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.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Update to a patched firmware version that removes the hardcoded credentials, or if unavailable, disable the Telnet service entirely and implement network segmentation to prevent unauthorized access.

Recommended fix Moderate confidence

latest firmware version for DIR-820LW (e.g., version 2.04 or later) from D-Link's official support site

  1. Identify the current firmware version of the D-Link DIR-820LW (e.g., via the router's web UI or by logging into the device).
  2. Visit the official D-Link support website (e.g., https://support.dlink.com or https://www.dlink.com/en/support) and locate the firmware download page for the DIR-820LW.
  3. Download the latest firmware version listed for the DIR-820LW (ensure it is newer than 2.03.B01_TC).
  4. Log into the router's web administration interface with admin credentials.
  5. Navigate to the 'Management' or 'Firmware Upgrade' section.
  6. Upload the downloaded firmware file and initiate the upgrade.
  7. After the upgrade completes, reboot the router as prompted.
  8. Once the router restarts, verify that the firmware version has been updated and confirm that the Telnet service no longer uses hardcoded credentials.
Caveat Ensure that any custom configurations (e.g., port forwards, wireless settings) are backed up before upgrading, as firmware updates may reset settings.

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Dir 820lw Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
Get help mitigating

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.

Scan for this in your stack

Free · runs locally
dbcve dependency scanner

Check whether your project pulls in CVE-2024-41610 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.

Get it on GitHub Scan in the browser

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-2024-41610 in production — separate from our analysis above.

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.

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
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data