CVE-2021-27250: D-Link DAP-2020 errorpage External Control of File Name Information Disclosure Vulnerability

Published Apr 14, 2021

Updated

This vulnerability allows network-adjacent attackers to disclose sensitive information on affected installations of D-Link DAP-2020 v1.01rc001 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. Was ZDI-CAN-11856.

Other sources

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

4 affected components

D-Link Dap-2020 Firmware=1.01-rc001

Dlink Dap-2020

Dlink Dap-2020 Firmware=1.01-rc001

D-Link DAP-2020

Remediation

Patch Available

https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10201

Event History

Apr 14, 2021

CVE Published

via MITRE·03:45 PM

Data Sourced

via MITRE·03:45 PM

DescriptionSeverityWeakness

Feb 28, 2025

Advisory Published

via ZDI·12:15 PM

Frequently Asked Questions

What is CVE-2021-27250?

CVE-2021-27250 is a vulnerability that allows network-adjacent attackers to disclose sensitive information on affected installations of D-Link DAP-2020 Wi-Fi access points.

Is authentication required to exploit CVE-2021-27250?

No, authentication is not required to exploit this vulnerability.

How can network-adjacent attackers exploit CVE-2021-27250?

Network-adjacent attackers can exploit CVE-2021-27250 by sending malicious requests to the affected D-Link DAP-2020 v1.01rc001 Wi-Fi access points.

What is the severity of CVE-2021-27250?

CVE-2021-27250 has a severity rating of 6.5 (medium).

How can I fix CVE-2021-27250?

To fix CVE-2021-27250, users should update their D-Link DAP-2020 firmware to version 1.01rc001 or higher as recommended by the vendor.