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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.
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2 events from the most recent confirmed update back to the earliest known activity.
A separate CVE, CVE-2026-5550, was recorded for a remotely exploitable stack-based buffer overflow in the same Tenda AC10 firmware and fromSysToolChangePwd function within /bin/httpd. The entry notes possible impact across multiple endpoints and includes severity metadata and references to technical findings.
A CVE entry for CVE-2026-5548 was received by cna@vuldb.com for a stack-based buffer overflow in Tenda AC10 firmware 16.03.10.10_multi_TDE01. The flaw affects the fromSysToolChangePwd function in /bin/httpd via the sys.userpass argument and is remotely exploitable.
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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
Two high-severity vulnerabilities have been disclosed in Tenda router firmware, affecting **Tenda AC5** version `15.03.06.47` and **Tenda AC6** version `15.03.05.16`. The flaws reside in the `formQuickIndex` function behind the `/goform/QuickIndex` POST request handler, where improper handling of the `PPPOEPassword` parameter can trigger a **stack-based buffer overflow**. Both issues are tracked as `CVE-2026-4903` for AC5 and `CVE-2026-4961` for AC6. The vulnerabilities are described as **remotely exploitable**, with **public exploits available**, raising the risk of real-world attacks against exposed devices. The entries map the weaknesses to `CWE-119` and `CWE-121`, and their published CVSS vectors indicate high impact across **confidentiality, integrity, and availability**, making these flaws significant for organizations or users still operating the affected firmware.
Jun 29, 2026
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.
Jul 20, 2026