Tenda Ac21 Firmware
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By the Year
In 2026 there have been 5 vulnerabilities in Tenda Ac21 Firmware with an average score of 6.9 out of ten. Last year, in 2025 Ac21 Firmware had 3 security vulnerabilities published. That is, 2 more vulnerabilities have already been reported in 2026 as compared to last year. Last year, the average CVE base score was greater by 1.90
| Year | Vulnerabilities | Average Score |
|---|---|---|
| 2026 | 5 | 6.90 |
| 2025 | 3 | 8.80 |
| 2024 | 1 | 0.00 |
| 2023 | 0 | 0.00 |
| 2022 | 2 | 7.50 |
It may take a day or so for new Ac21 Firmware vulnerabilities to show up in the stats or in the list of recent security vulnerabilities. Additionally vulnerabilities may be tagged under a different product or component name.
Recent Tenda Ac21 Firmware Security Vulnerabilities
Tenda AC21 16.03.08.16: formSetQosBand Buffer Overflow (Remote)
CVE-2026-4565
8.8 - High
- March 23, 2026
A vulnerability was detected in Tenda AC21 16.03.08.16. Impacted is the function formSetQosBand of the file /goform/SetNetControlList. Performing a manipulation of the argument list results in buffer overflow. The attack can be initiated remotely. The exploit is now public and may be used.
Classic Buffer Overflow
Tenda AC21 16.03.08.16 - Remote Info Disclosure via /cgi-bin/DownloadFlash
CVE-2026-2148
5.3 - Medium
- February 08, 2026
A security vulnerability has been detected in Tenda AC21 16.03.08.16. Affected is an unknown function of the file /cgi-bin/DownloadFlash of the component Web Management Interface. The manipulation leads to information disclosure. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used.
Information Disclosure
Tenda AC21 16.03.08.16 Info Disclosure via /cgi-bin/DownloadLog
CVE-2026-2147
5.3 - Medium
- February 08, 2026
A weakness has been identified in Tenda AC21 16.03.08.16. This impacts an unknown function of the file /cgi-bin/DownloadLog of the component Web Management Interface. Executing a manipulation can lead to information disclosure. The attack may be performed from remote. The exploit has been made available to the public and could be used for attacks.
Information Disclosure
Tenda AC21 1.1.1.1 Remote Command Injection via mDMZSetCfg dmzIp (CVE20261638)
CVE-2026-1638
6.3 - Medium
- January 29, 2026
A security flaw has been discovered in Tenda AC21 1.1.1.1/1.dmzip/16.03.08.16. The impacted element is the function mDMZSetCfg of the file /goform/mDMZSetCfg. The manipulation of the argument dmzIp results in command injection. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.
Command Injection
Tenda AC21 16.03.08.16 Stack Buffer Overflow in AdvSetMacMtuWan
CVE-2026-1637
8.8 - High
- January 29, 2026
A vulnerability was identified in Tenda AC21 16.03.08.16. The affected element is the function fromAdvSetMacMtuWan of the file /goform/AdvSetMacMtuWan. The manipulation leads to stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.
Stack Overflow
Remote Buffer Overflow in Tenda AC21 16.03.08.16 /goform/SetSysTimeCfg
CVE-2025-13446
8.8 - High
- November 20, 2025
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.
Stack Overflow
Buf Overflow Tenda AC21 16.03.08.16 /goform/SetIpMacBind Remote (CVE-2025-13445)
CVE-2025-13445
8.8 - High
- November 20, 2025
A flaw has been found in Tenda AC21 16.03.08.16. This affects an unknown part of the file /goform/SetIpMacBind. Executing a manipulation of the argument list can lead to stack-based buffer overflow. The attack can be executed remotely. The exploit has been published and may be used.
Stack Overflow
Tenda AC21 16.03.08.16 Buffer Overflow in PPTP Server formSetPPTPServer
CVE-2025-12611
8.8 - High
- November 03, 2025
A vulnerability was identified in Tenda AC21 16.03.08.16. This vulnerability affects the function formSetPPTPServer of the file /goform/SetPptpServerCfg. The manipulation of the argument startIp leads to buffer overflow. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.
Classic Buffer Overflow
Stack Overflow in Tenda AC21 firmware via /goform/openSchedWifi
CVE-2023-24333
- February 21, 2024
A 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 crafted POST request to /goform/openSchedWifi.
Tenda AC21 V16.03.08.15 Buffer Overflow via formSetMacFilterCfg (CVE-2022-44163)
CVE-2022-44163
7.5 - High
- November 21, 2022
Tenda AC21 V16.03.08.15 is vulnerable to Buffer Overflow via function formSetMacFilterCfg.
Memory Corruption
Buffer Overflow in Tenda AC21 16.03.08.15 via set_device_name
CVE-2022-44158
7.5 - High
- November 21, 2022
Tenda AC21 V16.03.08.15 is vulnerable to Buffer Overflow via function via set_device_name.
Memory Corruption
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