CVE-2021-46393 — CRITICAL (9.8)

Vulnerability Description

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.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Tenda	Ax3 Firmware	16.03.12.10
Tenda	Ax3	-

Related Weaknesses (CWE)

CWE-787

References

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

FAQ

What is CVE-2021-46393?

CVE-2021-46393 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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. Th...

How severe is CVE-2021-46393?

CVE-2021-46393 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2021-46393?

Check the references section above for vendor advisories and patch information. Affected products include: Tenda Ax3 Firmware, Tenda Ax3.