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Vulnerability record · CVE-2025-9791 · published 1 September 2025

CVE-2025-9791: Tenda ac20 firmware memory buffer overflow vulnerability

Tenda · Ac20 Firmware

A weakness has been identified in Tenda AC20 16.03.08.05. This vulnerability affects unknown code of the file /goform/fromAdvSetMacMtuWan. This manipulation of the argument wanMTU causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be exploited.

7.4 CVSS 4.0 High EPSS 0.86% · top 43.3% CWE-119 · Memory buffer overflowCWE-121 · Stack-based buffer overflow
7.4CVSS 4.0 base score, v2 9.0
0.86%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 4 tagged exploit
26 Sep 2026Last modified by NVD

Description

A weakness has been identified in Tenda AC20 16.03.08.05. This vulnerability affects unknown code of the file /goform/fromAdvSetMacMtuWan. This manipulation of the argument wanMTU causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be exploited.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

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

References

LinkTags
https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md ExploitThird Party Advisory
https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md#poc ExploitThird Party Advisory
https://vuldb.com/?ctiid.322106 Permissions RequiredVDB Entry
https://vuldb.com/?id.322106 Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.641088 Third Party AdvisoryVDB Entry
https://www.tenda.com.cn/ Product
https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md ExploitThird Party Advisory
https://github.com/Cpppq43/Tenda/blob/main/Tenda_AC20_V16.03.08.05.md#poc ExploitThird Party Advisory

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Related vulnerabilities

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

7.4CVE-2025-15356Tenda ac20 firmware memory buffer overflow vulnerabilityA vulnerability has been found in Tenda AC20 up to 16.03.08.12. The impacted element is the function sscanf of the file /goform/PowerSaveSet. The man…EPSS 4.0%7.4CVE-2025-14656Tenda ac20 firmware memory buffer overflow vulnerabilityA weakness has been identified in Tenda AC20 16.03.08.12. This affects the function httpd of the file /goform/openSchedWifi. Executing a manipulation…EPSS 0.74%7.4CVE-2025-14655Tenda ac20 firmware memory buffer overflow vulnerabilityA security flaw has been discovered in Tenda AC20 16.03.08.12. The impacted element is the function formSetRebootTimer of the file /goform/SetSysAuto…EPSS 3.3%7.4CVE-2025-14654Tenda ac20 firmware memory buffer overflow vulnerabilityA vulnerability was identified in Tenda AC20 16.03.08.12. The affected element is the function formSetPPTPUserList of the file /goform/setPptpUserLis…EPSS 3.3%7.4CVE-2025-13258Tenda ac20 firmware memory buffer overflow vulnerabilityA vulnerability was detected in Tenda AC20 up to 16.03.08.12. The impacted element is an unknown function of the file /goform/WifiExtraSet. The manip…EPSS 0.74%7.4CVE-2025-11385Tenda ac20 firmware memory buffer overflow vulnerabilityA vulnerability has been found in Tenda AC20 up to 16.03.08.12. The affected element is the function sscanf of the file /goform/fast_setting_wifi_set…EPSS 0.80%7.4CVE-2025-10815Tenda ac20 firmware memory buffer overflow vulnerabilityA vulnerability was identified in Tenda AC20 up to 16.03.08.12. Affected by this issue is the function strcpy of the file /goform/SetPptpServerCfg of…EPSS 0.83%7.4CVE-2025-10120Tenda ac20 firmware memory buffer overflow vulnerabilityA vulnerability was detected in Tenda AC20 up to 16.03.08.12. The impacted element is the function strcpy of the file /goform/GetParentControlInfo. T…EPSS 0.83%

Source: NIST National Vulnerability Database (record CVE-2025-9791), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.