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Vulnerability record · CVE-2025-14656 · published 14 December 2025

CVE-2025-14656: Tenda ac20 firmware memory buffer overflow vulnerability

Tenda · Ac20 Firmware

A weakness has been identified in Tenda AC20 16.03.08.12. This affects the function httpd of the file /goform/openSchedWifi. Executing a manipulation of the argument schedStartTime/schedEndTime can lead to buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.

7.4 CVSS 4.0 High EPSS 0.74% · top 47.4% CWE-119 · Memory buffer overflowCWE-120 · Classic buffer overflow
7.4CVSS 4.0 base score, v2 9.0
0.74%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 1 tagged exploit
17 Jun 2026Last modified by NVD

Description

A weakness has been identified in Tenda AC20 16.03.08.12. This affects the function httpd of the file /goform/openSchedWifi. Executing a manipulation of the argument schedStartTime/schedEndTime can lead to buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.

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/Madgeaaaaa/MY_VULN_2/blob/main/Tenda/VULN14/AC20_openSchedWifi.md ExploitThird Party Advisory
https://vuldb.com/?ctiid.336389 Permissions RequiredVDB Entry
https://vuldb.com/?id.336389 Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.712917 Third Party AdvisoryVDB Entry
https://www.tenda.com.cn/ Product

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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-2025-14655Tenda 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%7.4CVE-2025-9791Tenda ac20 firmware memory buffer overflow vulnerabilityA weakness has been identified in Tenda AC20 16.03.08.05. This vulnerability affects unknown code of the file /goform/fromAdvSetMacMtuWan. This manip…EPSS 0.86%

Source: NIST National Vulnerability Database (record CVE-2025-14656), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.