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CERT/CC disclosed an unpatched authentication backdoor in firmware used by several older Tenda Wi-Fi routers, tracked as CVE-2026-11405, that can let attackers bypass normal web login and gain administrator access. The flaw lies in the router web interface's login logic, which reportedly falls back to a secondary authentication path after a failed login attempt and validates only a stored password value instead of both username and password. Researchers said the alternate password appears to be rzadmin, and because the username is not checked, an attacker may be able to log in with any username paired with the backdoor password.
The affected issue spans five firmware versions across multiple Tenda models, and no official vendor patch was available at disclosure. Successful exploitation could allow attackers to change router settings, disable security protections, and potentially compromise connected local networks. Reporting on the disclosure also pointed to a broader pattern of security problems in Tenda devices, citing earlier hardcoded credential exposure, CVE-2020-35391 in the Tenda N300 that exposed configuration data and administrative passwords, and CVE-2026-36794, a denial-of-service flaw in the Tenda W3. CERT/CC advised users to disable remote web management, change the default LAN IP address, and replace unsupported devices if updates are unavailable.
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CERT/CC disclosed CVE-2026-11405, an undocumented authentication backdoor affecting five firmware versions across multiple older Tenda Wi-Fi router models. The flaw allows attackers to bypass normal login and obtain administrator access, and no official vendor patch was available at the time of disclosure.
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CERT/CC disclosed `CVE-2026-11405`, an undocumented authentication backdoor affecting multiple Tenda router firmware versions that can let attackers bypass normal login checks and gain full administrative access to the web management interface. The flaw is located in the `/bin/httpd` binary's `login()` function, where failed authentication can fall through to an alternate path that compares the supplied password against a configuration value using plaintext `strcmp()` logic; the associated `rzadmin` username is not properly validated, so any username may succeed if paired with the backdoor password. A successful exploit could allow remote attackers to change network settings, disable security protections, redirect traffic, install malicious firmware, and maintain persistence for man-in-the-middle activity or lateral movement. CERT/CC said the issue was reported by an anonymous researcher, published as Vulnerability Note `VU#213560`, and remained unpatched at disclosure time after unsuccessful vendor coordination attempts, prompting guidance to disable remote web management, change the default LAN IP address, monitor for firmware updates, and consider replacing affected devices if no fix becomes available.
Jul 11, 2026
Two high-severity vulnerabilities, **CVE-2026-5548** and **CVE-2026-5550**, were disclosed in **Tenda AC10** firmware `16.03.10.10_multi_TDE01`, both affecting the `/bin/httpd` component. The flaws are stack-based buffer overflows in the `fromSysToolChangePwd` function, where crafted input to the `sys.userpass` argument can trigger memory corruption during password-change handling. Both entries classify the issue under **CWE-119** and **CWE-121** and indicate the vulnerabilities can be exploited remotely. Severity metadata attached to the CVE records shows high impact on **confidentiality, integrity, and availability**, with CVSS v3.1 scoring reflecting **network attackability**, **low attack complexity**, **low privileges required**, and **no user interaction**. The disclosures were accompanied by references to a GitHub technical finding, VulDB records, and Tenda-related resources, indicating that multiple endpoints tied to the same password-management code path may be exposed in affected devices.
Jun 29, 2026
Two high-severity vulnerabilities have been disclosed in **Tenda AC15** router firmware, both involving stack-based buffer overflows in web management handlers that are reachable through crafted POST requests. **CVE-2026-4975** affects firmware version `15.03.05.19` in the `formSetCfm` function behind the `/goform/setcfm` endpoint, where manipulation of the `funcpara1` parameter can corrupt memory and potentially allow remote compromise of the device. A second flaw, **CVE-2026-5830**, affects Tenda AC15 version `15.03.05.18` in the `websGetVar` function used by `/goform/SysToolChangePwd`; crafted `oldPwd`, `newPwd`, or `cfmPwd` values can trigger another stack-based overflow. Both issues are classified under **`CWE-119`** and **`CWE-121`**, carry high-impact severity ratings for confidentiality, integrity, and availability, and have been publicly disclosed, with the latter report explicitly noting that a public exploit is available.
Jun 29, 2026