What is CVE-2021-46393?

CVE-2021-46393 is a stack buffer overflow vulnerability in the formSetPPTPServer function of Tenda-AX3 router. The vulnerability occurs due to a lack of security checks, allowing an attacker to overflow the stack.

What is the severity of CVE-2021-46393?

CVE-2021-46393 has a severity score of 9.8, which is considered critical.

How does CVE-2021-46393 affect Tenda-AX3 router?

CVE-2021-46393 affects Tenda-AX3 router with firmware version 16.03.12.10_CN.

Is Tenda-AX3 router vulnerable to CVE-2021-46393?

Yes, Tenda-AX3 router with firmware version 16.03.12.10_CN is vulnerable to CVE-2021-46393.

Is there a fix for CVE-2021-46393?

At the moment, there is no official fix available for CVE-2021-46393. It is recommended to follow the vendor's security advisories for updates or mitigation steps.

Vulnerability/
CVE-2021-46393

critical

9.8

CWE

787 119

4/3/2022

4/8/2024

CVE-2021-46393: Buffer Overflow

First published: Fri Mar 04 2022(Updated: )

There is a stack buffer overflow vulnerability in the formSetPPTPServer function of Tenda-AX3 router V16.03.12.10_CN. The v10 variable is directly retrieved from the http request parameter startIp. Then v10 will be splice to stack by function sscanf without any security check,which causes stack overflow. By POSTing the page /goform/SetPptpServerCfg with proper startIp, the attacker can easily perform remote code execution with carefully crafted overflow data.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
Tenda Ax3 Firmware	=16.03.12.10
Tenda AX3

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Reference Links

https://github.com/sec-bin/IoT-CVE/tree/main/Tenda/AX3/3

Frequently Asked Questions

What is CVE-2021-46393?
CVE-2021-46393 is a stack buffer overflow vulnerability in the formSetPPTPServer function of Tenda-AX3 router. The vulnerability occurs due to a lack of security checks, allowing an attacker to overflow the stack.
What is the severity of CVE-2021-46393?
CVE-2021-46393 has a severity score of 9.8, which is considered critical.
How does CVE-2021-46393 affect Tenda-AX3 router?
CVE-2021-46393 affects Tenda-AX3 router with firmware version 16.03.12.10_CN.
Is Tenda-AX3 router vulnerable to CVE-2021-46393?
Yes, Tenda-AX3 router with firmware version 16.03.12.10_CN is vulnerable to CVE-2021-46393.
Is there a fix for CVE-2021-46393?
At the moment, there is no official fix available for CVE-2021-46393. It is recommended to follow the vendor's security advisories for updates or mitigation steps.

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vendor/tenda
canonical/tenda ax3 firmware
version/tenda ax3 firmware/16.03.12.10
canonical/tenda ax3

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