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Vigor2620 FirmwareOperating system · Draytek

CVE-2024-41596

HIGH · 8.0 CVSS v3.1 Published 2024-10-03
Fix available
A fix is available. Upgrade to 4.4.5.2 / 4.4.5.3 or later.
See remediation →
82/100
Remediation priority · High
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
Buffer Overflow vulnerabilities exist in DrayTek Vigor310 devices through 4.3.2.6 (in the Vigor management UI) because of improper retrieval and handling of the CGI form parameters.

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 DrayTek Vigor310 devices firmware 4.3.2.6 and prior in the Vigor management web interface. The vulnerability stems from improper validation and handling of CGI form parameters passed to the web service, allowing an attacker to overflow buffers via crafted input.

MitigationApply the vendor-supplied firmware patch to upgrade beyond version 4.3.2.6. Until patched, restrict access to the management interface to trusted networks or IP addresses 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
Vigor2620 FirmwareOperating system
Affected:all versions
Vigor2915 FirmwareOperating system
Affected:< 4.4.5.3
Vigor2866 FirmwareOperating system
Affected:< 4.4.5.2
Vigor2766 FirmwareOperating system
Affected:< 4.4.5.3
Vigor2865 FirmwareOperating system
Affected:< 4.4.5.2
Vigor2765 FirmwareOperating system
Affected:< 4.4.5.3
Vigor2763 FirmwareOperating system
Affected:< 4.4.5.3
Vigor2135 FirmwareOperating system
Affected:< 4.4.5.3

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

CVSS:3.1/AV:A/AC:L/PR:L/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 your DrayTek Vigor model
    Locate the device label on the router chassis or log into the web management interface and check the status/dashboard page for the model number
    Affected if The model is one of: Vigor2620, Vigor2915, Vigor2866, Vigor2766, Vigor2865, Vigor2765, Vigor2763, or Vigor2135
  2. Determine the installed firmware version
    In the web management interface, go to System Status or Dashboard to view the firmware version. Alternatively, access the router via CLI and check the firmware version.
    Affected if The firmware version is below the fixed version for your model: Vigor2915/Vigor2766/Vigor2765/Vigor2763/Vigor2135 < 4.4.5.3, Vigor2866/Vigor2865 < 4.4.5.2, or Vigor2620 (any version)
  3. Confirm the web management interface is enabled
    In the web interface, go to System Maintenance > Management or System Setup > Access Control and verify HTTP/HTTPS management access is enabled
    Affected if The web management interface is enabled and accessible (this is the default state)
  4. Verify CGI processing is active
    The vulnerability exploits CGI form parameter handling in the web server. This functionality is active by default when the web management interface is enabled.
    Affected if The web management interface is running - CGI parameter processing is a core function of the Vigor web interface

You are affected if you have a DrayTek Vigor model from the affected list running firmware version lower than the specified threshold for your model, and the web management interface is enabled.

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 4.4.5.2 / 4.4.5.3 or later
Fixed in 4.4.5.24.4.5.3
Interim mitigation

Apply the vendor-supplied firmware patch to upgrade beyond version 4.3.2.6. Until patched, restrict access to the management interface to trusted networks or IP addresses only.

Recommended fix High confidence

Model-specific firmware: Vigor2915 -> 4.4.5.3 | Vigor2866 -> 4.4.5.2 | Vigor2766 -> 4.4.5.3 | Vigor2865 -> 4.4.5.2 | Vigor2765 -> 4.4.5.3 | Vigor2763 -> 4.4.5.3 | Vigor2135 -> 4.4.5.3 | Vigor2620 -> contact vendor

  1. 1. Identify the specific DrayTek Vigor model from the affected list (Vigor2620, Vigor2915, Vigor2866, Vigor2766, Vigor2865, Vigor2765, Vigor2763, or Vigor2135)
  2. 2. Access the Vigor management UI via the device's web interface
  3. 3. Navigate to the firmware update or system maintenance section
  4. 4. Download the appropriate firmware version from the DrayTek official support site: for Vigor2915 use 4.4.5.3, for Vigor2866 use 4.4.5.2, for Vigor2766 use 4.4.5.3, for Vigor2865 use 4.4.5.2, for Vigor2765 use 4.4.5.3, for Vigor2763 use 4.4.5.3, for Vigor2135 use 4.4.5.3
  5. 5. Upload and apply the firmware update via the web interface
  6. 6. Verify the firmware version has been successfully updated after reboot
  7. 7. For Vigor2620 (all versions affected with no specified fix), contact DrayTek support for available firmware updates or consider network segmentation as a mitigating control
Caveat Standard firmware update risks apply - ensure backups of configuration and verify compatibility before deploying in production

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

Fix this in Vigor2620 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation2.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,970
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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-2024-41596 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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