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Vulnerability record · CVE-2021-31757 · published 7 May 2021

CVE-2021-31757: Tenda ac11 firmware out-of-bounds write vulnerability

Tenda · Ac11 Firmware

An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. A stack buffer overflow vulnerability in /goform/setVLAN allows attackers to execute arbitrary code on the system via a crafted post request.

9.8 CVSS 3.1 Critical EPSS 3.3% · top 12.0% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 10.0
3.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. A stack buffer overflow vulnerability in /goform/setVLAN allows attackers to execute arbitrary code on the system via a crafted post request.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/Yu3H0/IoT_CVE/tree/main/Tenda/CVE_4 ExploitThird Party Advisory
https://github.com/Yu3H0/IoT_CVE/tree/main/Tenda/CVE_4 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-31755Tenda AC11 router setmac stack buffer overflowTenda AC11 devices running firmware through 02.03.01.104_CN contain a stack buffer overflow in the /goform/setmac handler. A crafted POST request can…KEVEPSS 87%analysed9.8CVE-2021-46262Tenda ac11 firmware out-of-bounds write vulnerabilityTenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer overflow in the PPPoE module. This vulnerability allows attacke…EPSS 1.7%9.8CVE-2021-46263Tenda ac11 firmware out-of-bounds write vulnerabilityTenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer overflow in the wifiTime module. This vulnerability allows atta…EPSS 1.7%9.8CVE-2021-46264Tenda ac11 firmware out-of-bounds write vulnerabilityTenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer overflow in the onlineList module. This vulnerability allows at…EPSS 1.7%9.8CVE-2021-46265Tenda ac11 firmware out-of-bounds write vulnerabilityTenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer overflow in the wanBasicCfg module. This vulnerability allows a…EPSS 1.7%9.8CVE-2021-46321Tenda ac11 firmware out-of-bounds write vulnerabilityTenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer overflow in the wifiBasicCfg module. This vulnerability allows …EPSS 1.7%9.8CVE-2021-31756Tenda ac11 firmware out-of-bounds write vulnerabilityAn issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. A stack buffer overflow vulnerability in /gofrom/setwanType allo…EPSS 2.9%9.8CVE-2021-31758Tenda ac11 firmware out-of-bounds write vulnerabilityAn issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. A stack buffer overflow vulnerability in /goform/setportList all…EPSS 6.6%

Source: NIST National Vulnerability Database (record CVE-2021-31757), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.