CVE-2025-65226
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
Tenda AC21 V16.03.08.16 is vulnerable to Buffer Overflow via the deviceId parameter in /goform/saveParentControlInfo.
Risk Assessment
A remote attacker could exploit the buffer overflow to crash the device or potentially execute code, threatening the confidentiality and availability of the home network.
Recommendation
Update the Tenda AC21 router firmware to the latest version or apply the vendor patch. Until then, restrict access to the administrative interface.
Other vulnerabilities in Tenda AC21
See all- CVE-2025-13446High
Tenda AC21 16.03.08.16 has a vulnerability in unknown code of /goform/SetSysTimeCfg. Manipulation of the timeZone/time arguments leads to a stack-based buffer overflow, and the attack can be carried out remotely. The exploit has been publicly disclosed and may be used.
- CVE-2025-65223Medium
Tenda AC21 V16.03.08.16 is vulnerable to Buffer Overflow via the urls parameter of /goform/saveParentControlInfo. A remote attacker can exploit this to execute arbitrary code or cause a denial of service.
- CVE-2025-65222Medium
The Tenda AC21 router version V16.03.08.16 is vulnerable to a buffer overflow via the rebootTime parameter of /goform/SetSysAutoRebbotCfg. An attacker can send a crafted request that triggers the overflow.
- CVE-2025-65221Medium
Tenda AC21 V16.03.08.16 is vulnerable to Buffer Overflow via the list parameter of /goform/setPptpUserList. A remote attacker can exploit this to execute arbitrary code or cause a denial of service.
- CVE-2025-65220Medium
Tenda AC21 V16.03.08.16 is vulnerable to Buffer Overflow in /goform/SetVirtualServerCfg via the list parameter.
- CVE-2025-12611High
A vulnerability was identified in Tenda AC21 16.03.08.16 affecting the formSetPPTPServer function of the file /goform/SetPptpServerCfg. Manipulation of the startIp argument leads to buffer overflow, and remote exploitation of the attack is possible.
- CVE-2025-11091High
A buffer overflow vulnerability has been discovered in Tenda AC21 up to 16.03.08.16, affecting the sscanf function in /goform/SetStaticRouteCfg. Manipulation of the list argument results in buffer overflow. The attack can be launched remotely and the exploit has been released to the public.
- CVE-2025-10838High
A vulnerability was identified in Tenda AC21 16.03.08.16. The affected element is the function sub_45BB10 of the file /goform/WifiExtraSet. The manipulation of the argument wpapsk_crypto leads to buffer overflow. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.
Original NVD description (English source)
Tenda AC21 V16.03.08.16 is vulnerable to Buffer Overflow via the deviceId parameter in /goform/saveParentControlInfo.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

