8.8
CWE
121
Advisory Published
Updated
Advisory Published

CVE-2021-34862: D-Link DAP-2020 webproc var:menu Stack-based Buffer Overflow Remote Code Execution Vulnerability

First published: Mon Oct 25 2021(Updated: )

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 1.01rc001 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the var:menu parameter provided to the webproc endpoint. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-13270.

Credit: zdi-disclosures@trendmicro.com

Affected SoftwareAffected VersionHow to fix
D-Link DAP-2020<=1.01
D-Link DAP-2020

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Frequently Asked Questions

  • What is CVE-2021-34862?

    CVE-2021-34862 is a vulnerability that allows network-adjacent attackers to execute arbitrary code on affected installations of D-Link DAP-2020 1.01rc001 routers.

  • How severe is CVE-2021-34862?

    CVE-2021-34862 has a severity score of 8.8 (high).

  • What is the affected software of CVE-2021-34862?

    The affected software is D-Link DAP-2020 1.01rc001 routers.

  • Is authentication required to exploit CVE-2021-34862?

    No, authentication is not required to exploit this vulnerability.

  • How can I fix CVE-2021-34862?

    Apply the security patch provided by D-Link for the DAP-2020 1.01rc001 routers.

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