S4E just found a high-severity finding from top 10 tcp port service scan
PlatformPlansPartners
Resources
ToolsBlogDocs
Sign Up →
medium·Product Based Web Vulnerabilities·Updated Jan 3, 2024

CVE-2021-21816 Scanner

CVE-2021-21816 scanner - Information Disclosure vulnerability in D-LINK DIR-3040

Est. Time~10 seconds
Scan TypeSingle Scan
Targetsurl
CostFree
3.4k
Times Used
continuous scan runs
4.8k
Continuously Checked
assets under CS
0
Vulnerabilities Found
confirmed findings
References
CVECVE-2021-21816
4.3
CVSSmedium
Exploitable remotely over the internet · no authentication required · user interaction needed.

An information disclosure vulnerability exists in the Syslog functionality of D-LINK DIR-3040 1.13B03. A specially crafted network request can lead to the disclosure of sensitive information. An attacker can send an HTTP request to trigger this vulnerability.

Attack Vector
Network
Privileges Req.
None
User Interaction
Required
Affected
D-LINKby n/a
D-LINK DIR-3040 1.13B03
Updated Aug 21, 2026View on NVD →
Detail

The D-LINK DIR-3040 is a popular networking device used for home or small office environments. It is designed to provide a fast and reliable internet connection to multiple devices simultaneously. Additionally, it comes equipped with advanced features such as QoS settings, parental controls, and a built-in Firewall to help secure the network from potential cyber threats. 

However, despite this device's excellent features, it has recently been discovered that it is prone to a significant vulnerability known as CVE-2021-21816. This vulnerability deals with the Syslog functionality of the device, which is a logging mechanism used to collect and store system messages. The vulnerability is present in the device's 1.13B03 firmware version and can lead to sensitive information being disclosed through network requests.

Exploiting the vulnerability can lead to a variety of issues, including the unauthorized disclosure of sensitive information, such as system logs and network configurations. Attackers can leverage this information to gain access to the device or network, ultimately leading to the hijacking of sensitive data or unauthorized access to devices on the network.

In conclusion, security is paramount for any digital assets, and protecting them from vulnerabilities is essential. s4e.io provides comprehensive security information for individuals and businesses alike, offering an easy-to-use and quick solution to identify vulnerabilities in digital assets and taking action to mitigate them. By staying vigilant and implementing the necessary precautions, D-LINK users can ensure that their digital assets are secure from potential cyber threats.

 

REFERENCES

Solution Advice

To protect against this vulnerability, D-LINK users are advised to update their devices to the latest firmware version, which has addressed this vulnerability. Additionally, users can take the following precautions to reduce the risk of the vulnerability being exploited:

  • Regularly update the firmware version of the networking device
  • Implement a strong and unique network password
  • Disable unneeded network services, such as UPnP and remote management
  • Isolate IoT devices on their network to reduce the scope of potential attacks.

Get AI-powered remediation steps tailored to your asset.

Try AI Solutions →

Check your infrastructure.
Right now.

11,000+ scanners. Free to start. No credit card required.

CVE-2021-21816 scanner - Information Disclosure vulnerability in D-LINK DIR-3040 | S4E