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Dir 600l FirmwareOperating system · Dlink

CVE-2025-4342

CRITICAL · 9.8 CVSS v3.1 Published 2025-05-06
Fix available
A fix is available. Upgrade to after 2.07b01 or later.
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
A vulnerability, which was classified as critical, has been found in D-Link DIR-600L up to 2.07B01. Affected by this issue is the function formEasySetupWizard3. The manipulation of the argument host leads to buffer overflow. The attack may be launched remotely. This vulnerability only affects products that are no longer supported by the maintainer.

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 · moderate confidence

A buffer overflow vulnerability exists in the formEasySetupWizard3 function of D-Link DIR-600L routers (versions up to 2.07B01), where manipulation of the 'host' argument leads to buffer overflow. This can be exploited remotely with CVSS 9.8 critical severity.

MitigationNo vendor patch available as product is end-of-life; replace affected devices with supported hardware or implement strict network access controls to reduce exposure.

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 600l FirmwareOperating system
Affected:<= 2.07b01

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 (typically at 192.168.0.1) and check the device information page, or check the device label for model number DIR-600L
    Affected if Device is a D-Link DIR-600L router
  2. Check the firmware version
    In the router web interface, navigate to Status or System > Firmware version. Compare the displayed version to 2.07B01
    Affected if Firmware version is 2.07B01 or lower (any version up to and including 2.07B01)
  3. Verify the web management interface is accessible
    Attempt to access the router's HTTP/HTTPS web interface on the LAN or WAN IP address. The vulnerable formEasySetupWizard3 function handles setup wizard requests
    Affected if The web interface responds to requests - the vulnerability is in the form handler
  4. Check network exposure of the router web interface
    Determine if the router's web interface (port 80/443) is exposed to the internet or untrusted networks. Check router WAN IP and port scans, or review port forwarding/firewall rules
    Affected if The router web interface is directly accessible from the internet (WAN side)

If the device is a D-Link DIR-600L running firmware version 2.07B01 or lower, and the web interface is accessible (especially from the internet), the environment is affected by this vulnerability.

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
Upgrade available Upgrade to a release after 2.07b01
Interim mitigation

No vendor patch available as product is end-of-life; replace affected devices with supported hardware or implement strict network access controls to reduce exposure.

Recommended fix High confidence
  1. 1. This vulnerability affects the D-Link DIR-600L router, which is explicitly stated as a product no longer supported by the maintainer.
  2. 2. No official firmware patch or security update will be released by D-Link for this device.
  3. 3. Replace the D-Link DIR-600L with a currently supported router from D-Link or another manufacturer that provides regular security updates.
  4. 4. If replacement is not immediately possible, isolate the affected device on a restricted network segment to limit potential attack surface.
  5. 5. Disable any exposed services on the device (such as remote management interfaces) if not strictly necessary.
Caveat The DIR-600L is end-of-life with no firmware updates available; device replacement is the only remediation option.

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

Fix this in Dir 600l 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
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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-2025-4342 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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