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Vulnerability record · CVE-2020-13392 · published 22 May 2020

CVE-2020-13392: Tendacn ac6 firmware classic buffer overflow vulnerability

Tendacn · Ac6 Firmware

An issue was discovered on Tenda AC6 V1.0 V15.03.05.19_multi_TD01, AC9 V1.0 V15.03.05.19(6318)_CN, AC9 V3.0 V15.03.06.42_multi, AC15 V1.0 V15.03.05.19_multi_TD01, and AC18 V15.03.05.19(6318_)_CN devices. There is a buffer overflow vulnerability in the router's web server -- httpd. While processing the /goform/setcfm funcpara1 parameter for a POST request, a value is directly used in a sprintf to a local variable placed on the stack, which overwrites the return address of a function. An attacker can construct a payload to carry out arbitrary code execution attacks.

9.8 CVSS 3.1 Critical EPSS 2.6% · top 15.2% CWE-120 · Classic buffer overflow
9.8CVSS 3.1 base score, v2 7.5
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
4References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered on Tenda AC6 V1.0 V15.03.05.19_multi_TD01, AC9 V1.0 V15.03.05.19(6318)_CN, AC9 V3.0 V15.03.06.42_multi, AC15 V1.0 V15.03.05.19_multi_TD01, and AC18 V15.03.05.19(6318_)_CN devices. There is a buffer overflow vulnerability in the router's web server -- httpd. While processing the /goform/setcfm funcpara1 parameter for a POST request, a value is directly used in a sprintf to a local variable placed on the stack, which overwrites the return address of a function. An attacker can construct a payload to carry out arbitrary code execution attacks.

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

Affected products

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

References

LinkTags
https://joel-malwarebenchmark.github.io ExploitThird Party Advisory
https://joel-malwarebenchmark.github.io/blog/2020/04/28/cve-2020-13392-Tenda-vulnerability/ ExploitThird Party Advisory
https://joel-malwarebenchmark.github.io ExploitThird Party Advisory
https://joel-malwarebenchmark.github.io/blog/2020/04/28/cve-2020-13392-Tenda-vulnerability/ ExploitThird Party Advisory

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Related vulnerabilities

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

9.8CVE-2024-33182Tendacn ac18 firmware out-of-bounds write vulnerabilityTenda AC18 V15.03.3.10_EN was discovered to contain a stack-based buffer overflow vulnerability via the deviceId parameter at ip/goform/addWifiMacFil…EPSS 0.61%9.8CVE-2024-33180Tendacn ac18 firmware out-of-bounds write vulnerabilityTenda AC18 V15.03.3.10_EN was discovered to contain a stack-based buffer overflow vulnerability via the deviceId parameter at ip/goform/saveParentCon…EPSS 0.63%9.8CVE-2023-40942Tendacn ac9 firmware out-of-bounds write vulnerabilityTenda AC9 V3.0BR_V15.03.06.42_multi_TD01 was discovered stack overflow via parameter 'firewall_value' at url /goform/SetFirewallCfg.EPSS 0.84%9.8CVE-2022-40860Tendacn ac15 firmware out-of-bounds write vulnerabilityTenda AC15 router V15.03.05.19 contains a stack overflow vulnerability in the function formSetQosBand->FUN_0007dd20 with request /goform/SetNetContro…EPSS 1.2%9.8CVE-2022-40865Tendacn ac15 firmware out-of-bounds write vulnerabilityTenda AC15 and AC18 routers V15.03.05.19 contain heap overflow vulnerabilities in the function setSchedWifi with the request /goform/openSchedWifi/EPSS 1.5%9.8CVE-2022-40862Tendacn ac15 firmware out-of-bounds write vulnerabilityTenda AC15 and AC18 router V15.03.05.19 contains stack overflow vulnerability in the function fromNatStaticSetting with the request /goform/NatStatic…EPSS 1.5%9.8CVE-2022-40853Tendacn ac15 firmware out-of-bounds write vulnerabilityTenda AC15 router V15.03.05.19 contains a stack overflow via the list parameter at /goform/fast_setting_wifi_setEPSS 1.2%9.8CVE-2022-40869Tendacn ac15 firmware out-of-bounds write vulnerabilityTenda AC15 and AC18 routers V15.03.05.19 contain stack overflow vulnerabilities in the function fromDhcpListClient with a combined parameter "list*" …EPSS 1.5%

Source: NIST National Vulnerability Database (record CVE-2020-13392), CISA KEV, FIRST EPSS (scores of 2026-10-17). This page is refreshed as NVD updates the record.