CVE-2025-55583

D-Link DIR-868L B1 router firmware version FW2.05WWB02 contains an unauthenticated OS command injection vulnerability in the fileaccess.cgi component

Critical · published August 28, 2025

CVSS v3.1
9.8
EPSS
7%
Percentile
94.1
In the wild
Unconfirmed
What it is

🚨 An unauthenticated OS command injection vulnerability lurks in the D-Link DIR-868L B1 router, allowing attackers to execute commands as root without breaking a sweat! 🔥 Think of it like a restaurant where anyone can walk into the kitchen and start issuing orders to the chefs—no reservation or ID needed! This flaw in the router's file access component lets malicious users take control without any checks in place. If exploited, attackers could run any command they want on your router, potentially leading to a complete takeover of your network. They could intercept sensitive data, redirect traffic, or even launch attacks against other devices connected to your network—absolutely devastating!

Put simply

Think of it like a restaurant where anyone can walk into the kitchen and start issuing orders to the chefs—no reservation or ID needed! This flaw in the router's file access component lets malicious users take control without any checks in place. This vulnerability stems from the /dws/api/UploadFile endpoint not validating the pre_api_arg parameter, which is passed directly to system-level shell commands. This means that any attacker can send crafted HTTP requests to execute arbitrary commands with root privileges.

What to do

If exploited, attackers could run any command they want on your router, potentially leading to a complete takeover of your network. They could intercept sensitive data, redirect traffic, or even launch attacks against other devices connected to your network—absolutely devastating! To protect yourself, immediately patch your D-Link DIR-868L B1 router to firmware version FW2.05WWB03 or later. Additionally, consider disabling unnecessary features and changing default credentials to enhance your security. Regularly check for future updates! You've got this! Patch up and secure your router today—your network will thank you! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.06974 · 94.1th percentile
Published
2025-08-28T00:00Z
EPSS history
Timeline
  • 28 AUG 00:00Z
    D-Link DIR-868L B1 router firmware version FW2.05WWB02 contains an unauthenticated OS command injection vulnerability in the fileaccess.cgi component
    cvelistv5