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Dap 1860 FirmwareOperating system · Dlink

CVE-2020-27865

HIGH · 8.8 CVSS v3.1 Published 2021-02-12
Fix available
A fix is available. Upgrade to after 1.04b03 or later.
See remediation →
93/100
Remediation priority · Urgent
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
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-1860 firmware version 1.04B03 WiFi extenders. Authentication is not required to exploit this vulnerability. The specific flaw exists within the uhttpd service, which listens on TCP port 80 by default. The issue results from incorrect string matching logic when accessing protected pages. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the device. Was ZDI-CAN-10894.

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 path traversal or authentication bypass vulnerability exists in the uhttpd web server service on D-Link DAP-1860 WiFi extenders (firmware 1.04B03). The service incorrectly validates string matching when handling requests to protected pages, allowing unauthenticated network-adjacent attackers to access privileged functionality and execute arbitrary code in the device context.

MitigationApply vendor-supplied firmware patches when available; until then, restrict network access to the device's management interface using firewall rules or network segmentation to limit exposure to only trusted local network segments.

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
Dap 1860 FirmwareOperating system
Affected:<= 1.04b03

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
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/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 DAP-1860
    Access the device web management interface and check the status page or system information section, or log into the device CLI and run 'cat /proc/sys/kernel/random/uuid' or check the label on the device for the model number.
    Affected if The device is not a D-Link DAP-1860 model.
  2. Check installed firmware version
    In the web interface, navigate to System > Firmware Upgrade or Status page to view the current firmware version. For CLI access, run 'cat /proc/version' or 'nvram get firmware_version' if available.
    Affected if The firmware version is 1.04B03 or any version prior to it (lower version numbers).
  3. Verify uhttpd web server is running
    Check if the uhttpd process is active by running 'ps | grep uhttpd' via CLI or by inspecting the running processes in the device admin panel.
    Affected if The uhttpd service is not running on the device.
  4. Check management interface network exposure
    Review network firewall rules or ACLs on your router/gateway to determine if the DAP-1860 management port (typically HTTP port 80/HTTPS port 443) is accessible from untrusted network segments or the internet.
    Affected if The device management interface is accessible from networks outside your trusted local network (e.g., WAN/internet-facing or from guest WiFi segments).
  5. Test for authentication bypass vulnerability
    From a non-authenticated state, attempt to access a protected page directly by browsing to specific paths like /admin/ or /cgi-bin/ without providing credentials. If the page loads without redirecting to a login prompt, the device may be vulnerable.
    Affected if Protected administrative pages load without requiring authentication.

The device is affected if it is a D-Link DAP-1860 with firmware version 1.04B03 or earlier, the uhttpd web server is active, and the management interface is accessible to untrusted network attackers who could exploit the authentication bypass.

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
Upgrade available Upgrade to a release after 1.04b03
Interim mitigation

Apply vendor-supplied firmware patches when available; until then, restrict network access to the device's management interface using firewall rules or network segmentation to limit exposure to only trusted local network segments.

Fix this in Dap 1860 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
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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-2020-27865 in production — separate from our analysis above.

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What this is

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What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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  • No spam, self-promotion, credentials, or personal data