CVE-2021-21913CWE-798

An information disclosure vulnerability exists in the WiFi Smart Mesh functionality of D-LINK DIR-3040 1.13B03

Critical · published September 23, 2021

CVSS v3.0
10.0
EPSS
2%
Percentile
82.3
In the wild
Unconfirmed
What it is

🚨 An unsuspecting network request could open the floodgates! The WiFi Smart Mesh feature of D-LINK DIR-3040 is hiding a critical info disclosure vulnerability that can lead to command execution. 🔥 Think of it like a hotel where an insider could forge a guest pass to access restricted areas without ever being checked — utterly sneaky! In this case, the MQTT service is the front desk, and a crafted request is the forged pass that gets the attacker in. An attacker could exploit this vulnerability to execute commands on the device, potentially taking control of your network. Imagine the chaos of someone hijacking your WiFi settings, rerouting your traffic, or spying on your devices — absolutely devastating! Your privacy and security could hang in the balance.

Put simply

Think of it like a hotel where an insider could forge a guest pass to access restricted areas without ever being checked — utterly sneaky! In this case, the MQTT service is the front desk, and a crafted request is the forged pass that gets the attacker in. This vulnerability allows attackers to send specially-crafted network requests to the WiFi Smart Mesh functionality of the D-LINK DIR-3040, bypassing normal authentication and executing arbitrary commands via the MQTT service.

What to do

An attacker could exploit this vulnerability to execute commands on the device, potentially taking control of your network. Imagine the chaos of someone hijacking your WiFi settings, rerouting your traffic, or spying on your devices — absolutely devastating! Your privacy and security could hang in the balance. Immediately update your D-LINK DIR-3040 to version 1.13B04 or later to patch this vulnerability. Additionally, consider disabling the MQTT service if it’s not in use to mitigate potential risks. Regularly monitor network traffic for any suspicious activity as a precaution. You've got this! Follow these steps and you'll be well on your way to securing your network like a true hero! 🛡️

The record
Technical detail
CVSS v3.0
10.0 · CRITICAL
Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.02187 · 82.3th percentile
Weakness
CWE-798 · Use of Hard-coded Credentials
Published
2021-09-23T14:48Z
EPSS history
Timeline
  • 23 SEP 14:48Z
    An information disclosure vulnerability exists in the WiFi Smart Mesh functionality of D-LINK DIR-3040 1.13B03
    cvelistv5