What is the severity of ZDI-21-205?

The severity of ZDI-21-205 is classified as high due to its potential for disclosing sensitive information without authentication.

How do I fix ZDI-21-205?

To fix ZDI-21-205, ensure that the D-Link DAP-2020 firmware is updated to the latest version provided by the vendor.

Who is affected by ZDI-21-205?

ZDI-21-205 affects installations of D-Link DAP-2020 Wi-Fi access points that have not been patched against this vulnerability.

What type of attacks can be performed using ZDI-21-205?

ZDI-21-205 allows network-adjacent attackers to exploit the vulnerability to disclose sensitive information.

Is authentication required to exploit ZDI-21-205?

No, authentication is not required to exploit ZDI-21-205, making it particularly dangerous.

Vulnerability/
ZDI-21-205

medium

6.5

28/2/2025

ZDI-21-205: D-Link DAP-2020 errorpage External Control of File Name Information Disclosure Vulnerability

This vulnerability allows network-adjacent attackers to disclose sensitive information on affected installations of D-Link DAP-2020 Wi-Fi access points. Authentication is not required to exploit this vulnerability. The specific flaw exists within the processing of CGI scripts. When parsing the errorpage request parameter, the process does not properly validate a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to disclose stored credentials, leading to further compromise.

Affected Software	Affected Version	How to fix
D-Link DAP-2020 Firmware

Never miss a vulnerability like this again

Reference Links

Frequently Asked Questions

What is the severity of ZDI-21-205?
The severity of ZDI-21-205 is classified as high due to its potential for disclosing sensitive information without authentication.
How do I fix ZDI-21-205?
To fix ZDI-21-205, ensure that the D-Link DAP-2020 firmware is updated to the latest version provided by the vendor.
Who is affected by ZDI-21-205?
ZDI-21-205 affects installations of D-Link DAP-2020 Wi-Fi access points that have not been patched against this vulnerability.
What type of attacks can be performed using ZDI-21-205?
ZDI-21-205 allows network-adjacent attackers to exploit the vulnerability to disclose sensitive information.
Is authentication required to exploit ZDI-21-205?
No, authentication is not required to exploit ZDI-21-205, making it particularly dangerous.

agent/references
agent/type
agent/softwarecombine
agent/severity
agent/title
agent/description
agent/event
agent/source
agent/tags
collector/zdi-advisory
source/ZDI
alias/ZDI-21-205
alias/ZDI-CAN-11856
alias/CVE-2021-27250
agent/software-canonical-lookup
agent/software-canonical-lookup-request
vendor/d-link
canonical/d-link dap-2020 firmware

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.