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Dir 600l FirmwareOperating system · Dlink

CVE-2025-4347

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 was found in D-Link DIR-600L up to 2.07B01. It has been declared as critical. Affected by this vulnerability is the function formWlSiteSurvey. The manipulation of the argument host leads to buffer overflow. The attack can 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 · high confidence

A buffer overflow vulnerability exists in the D-Link DIR-600L wireless router (firmware up to 2.07B01) in the formWlSiteSurvey function. The host argument is not properly bounds-checked, allowing an attacker to overflow a buffer via specially crafted HTTP requests to the router's web interface. The vulnerability is remotely exploitable and rated critical due to the potential for complete device compromise.

MitigationSince D-Link no longer supports the DIR-600L, the primary remediation is to replace the end-of-life device with a currently supported model. If immediate replacement is not feasible, network segmentation and firewall rules to restrict access to the router's management interface should be implemented as compensating controls.

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. Confirm device model is D-Link DIR-600L
    Access the router's web interface and check the device information page, or look for the physical device label showing the model number
    Affected if Device is not a D-Link DIR-600L, this CVE does not apply
  2. Check firmware version
    Log into the router's web interface and navigate to Status or System Info page to view the firmware version. The version is typically displayed as something like '2.07B01' or similar
    Affected if Firmware version is 2.07B01 or lower (any version up to and including 2.07b01)
  3. Verify HTTP management interface is active
    Attempt to access the router's web interface by entering the router's IP address in a web browser. The service typically runs on port 80
    Affected if HTTP service is running and accessible on the router
  4. Check if formWlSiteSurvey function is reachable
    The vulnerable function handles wireless site survey requests. Check if the wireless functionality is enabled and the web interface is accessible without authentication restrictions
    Affected if Wireless features are enabled and the management web interface is exposed (even on local network)

You are affected if you have a D-Link DIR-600L router running firmware version 2.07B01 or lower with its web interface accessible on the network.

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

Since D-Link no longer supports the DIR-600L, the primary remediation is to replace the end-of-life device with a currently supported model. If immediate replacement is not feasible, network segmentation and firewall rules to restrict access to the router's management interface should be implemented as compensating controls.

Recommended fix High confidence
  1. This vulnerability affects D-Link DIR-600L firmware versions up to and including 2.07b01.
  2. The affected product is explicitly stated as 'no longer supported by the maintainer' in the official description.
  3. No official firmware patch or security update is available for this vulnerability.
  4. Replace the end-of-life D-Link DIR-600L with a currently supported router from D-Link or another vendor.
  5. If replacement is not immediately possible, place the device behind a properly configured firewall with restricted inbound access to minimize exposure.
Caveat Device is end-of-life with no security support; replacement is the only viable remediation

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
  • Testing3.0 h
  • Review / QA2.0 h
17.0 hours of engineering $3,050
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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-2025-4347 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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