Vulnerability record · CVE-2025-13446 · published 20 November 2025

CVE-2025-13446: Tenda ac21 firmware memory buffer overflow vulnerability

Tenda · Ac21 Firmware

A vulnerability has been found in Tenda AC21 16.03.08.16. This vulnerability affects unknown code of the file /goform/SetSysTimeCfg. The manipulation of the argument timeZone/time leads to stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used.

7.4 CVSS 4.0 High EPSS 3.9% · top 10.1% CWE-119 · Memory buffer overflowCWE-121 · Stack-based buffer overflow

7.4CVSS 4.0 base score, v2 9.0

3.9%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

9References, 4 tagged exploit

17 Jun 2026Last modified by NVD

Description

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.

Ac21 Firmware Tenda

References

Link	Tags
https://github.com/Madgeaaaaa/MY_VULN_2/blob/main/Tenda/VULN8.md	ExploitThird Party Advisory
https://github.com/Madgeaaaaa/MY_VULN_2/blob/main/Tenda/VULN9.md	ExploitThird Party Advisory
https://vuldb.com/?ctiid.333018	Permissions RequiredVDB Entry
https://vuldb.com/?id.333018	Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.694425	Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.694430	Third Party AdvisoryVDB Entry
https://www.tenda.com.cn/	Product
https://github.com/Madgeaaaaa/MY_VULN_2/blob/main/Tenda/VULN8.md	ExploitThird Party Advisory
https://github.com/Madgeaaaaa/MY_VULN_2/blob/main/Tenda/VULN9.md	ExploitThird Party Advisory

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Related vulnerabilities

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

8.9CVE-2025-9605Tenda ac21 firmware memory buffer overflow vulnerabilityA security vulnerability has been detected in Tenda AC21 and AC23 16.03.08.16. Affected is the function GetParentControlInfo of the file /goform/GetP…EPSS 5.1%29 Aug 2025 8.8CVE-2023-24333Tenda ac21 firmware code injection vulnerabilityA stack overflow vulnerability in Tenda AC21 with firmware version US_AC21V1.0re_V16.03.08.15_cn_TDC01 allows attackers to run arbitrary commands via…EPSS 0.48%21 Feb 2024 7.5CVE-2022-44158Tenda ac21 firmware out-of-bounds write vulnerabilityTenda AC21 V16.03.08.15 is vulnerable to Buffer Overflow via function via set_device_name.EPSS 0.85%21 Nov 2022 7.5CVE-2022-44163Tenda ac21 firmware out-of-bounds write vulnerabilityTenda AC21 V16.03.08.15 is vulnerable to Buffer Overflow via function formSetMacFilterCfg.EPSS 0.85%21 Nov 2022 7.5CVE-2022-40067Tenda ac21 firmware out-of-bounds write vulnerabilityTenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, function: formSetVirtualSer.EPSS 0.99%19 Sep 2022 7.5CVE-2022-40068Tenda ac21 firmware out-of-bounds write vulnerabilityTenda AC21 V16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, function: formSetQosBand.EPSS 0.99%19 Sep 2022 7.5CVE-2022-40069Tenda ac21 firmware out-of-bounds write vulnerability]Tenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via /bin/httpd, function: fromSetSysTime.EPSS 0.99%19 Sep 2022 7.5CVE-2022-40070Tenda ac21 firmware out-of-bounds write vulnerabilityTenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via bin/httpd, function: formSetFirewallCfg.EPSS 0.99%19 Sep 2022

Source: NIST National Vulnerability Database (record CVE-2025-13446), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.