CVE-2025-55583
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-08-28

Last updated on: 2025-09-09

Assigner: MITRE

Description
D-Link DIR-868L B1 router firmware version FW2.05WWB02 contains an unauthenticated OS command injection vulnerability in the fileaccess.cgi component. The endpoint /dws/api/UploadFile accepts a pre_api_arg parameter that is passed directly to system-level shell execution functions without sanitization or authentication. Remote attackers can exploit this to execute arbitrary commands as root via crafted HTTP requests.
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Meta Information
Published
2025-08-28
Last Modified
2025-09-09
Generated
2026-06-16
AI Q&A
2025-08-28
EPSS Evaluated
2026-06-14
NVD
CVE-2025-55583
EUVD
EUVD-2025-26076
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
dlink dir-868l_firmware 2.05b02
dlink dir-868l b1
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-668 The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource.
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
Attack-Flow Graph
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Executive Summary

This vulnerability exists in the D-Link DIR-868L B1 router firmware version FW2.05WWB02, specifically in the fileaccess.cgi component. The pre_api_arg parameter in the /dws/api/UploadFile endpoint is passed directly to system-level shell execution functions without any input sanitization or authentication. This allows a remote attacker to send crafted HTTP requests that execute arbitrary commands with root privileges on the device, leading to full device compromise. [1]

Impact Analysis

Exploitation of this vulnerability can lead to full compromise of the affected router. An attacker can execute arbitrary commands as root, install persistent backdoors, intercept network traffic, hijack DNS settings, include the device in botnets, and move laterally within home or enterprise networks. This can result in loss of control over the device and significant security risks to the network it protects. [1]

Detection Guidance

This vulnerability can be detected by checking for the presence of the vulnerable endpoint /dws/api/fileaccess.cgi on the D-Link DIR-868L B1 router firmware version FW2.05WWB02. You can attempt to send crafted HTTP requests to the /dws/api/fileaccess.cgi or /dws/api/UploadFile endpoints with the pre_api_arg parameter to see if the device executes commands. For example, using curl to test command injection: curl -v --data "pre_api_arg=;id" http://<router-ip>/dws/api/fileaccess.cgi. If the response contains output of the 'id' command, the device is vulnerable. Additionally, scanning your network for devices running this firmware and checking for open HTTP services exposing these endpoints can help detect vulnerable devices. [1]

Mitigation Strategies

Immediate mitigation steps include disconnecting the affected D-Link DIR-868L B1 routers from the internet, disabling remote administration and port forwarding features to prevent WAN exploitation, and replacing legacy hardware with actively supported models. Users should avoid exposing the vulnerable endpoints to untrusted networks. Vendors are recommended to patch the firmware to sanitize and validate CGI input parameters, remove direct shell invocations, and drop root privileges for web-facing services. [1]

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