Tenda W15E: Ten Buffer Overflow Vulnerabilities Disclosed Together
Ten buffer overflow vulnerabilities were disclosed on June 9, 2026, affecting Tenda's W15E router, all leading to Denial of Service.
Key findings
- Ten buffer overflow vulnerabilities disclosed for Tenda W15E router.
- All vulnerabilities affect version v15.11.0.10.
- Each vulnerability can be exploited to cause a Denial of Service (DoS).
- Exploitation requires sending a crafted HTTP request.
- The issues are found in various web interface functions.
On June 9, 2026, a batch of ten vulnerabilities was disclosed, all affecting the Tenda W15E router, specifically version v15.11.0.10. All ten issues are classified as buffer overflows and can be exploited to cause a Denial of Service (DoS) condition. The vulnerabilities were discovered in various functions within the router's web interface, indicating potential weaknesses in how user-supplied input is handled.
These buffer overflow vulnerabilities stem from improper handling of parameters within several distinct functions. For instance, CVE-2026-36817 and CVE-2026-36808 are related to the formAddWebAuthWhiteUser and formAddWebAuthUser functions, respectively, both involving the webAuthWhiteUserInfo parameter. Similarly, CVE-2026-36807 and CVE-2026-36806, impacting formAddWebAuthUser and formModifyWebAuthUser functions, are tied to the webAuthUserPwd parameter. Other vulnerabilities target parameters such as wewifiWhiteUserInfo in formAddWewifiWhiteUser (CVE-2026-36816), hostname in formSetNetCheckTools (CVE-2026-36815), picCropName in formCropAndSetWewifiPic (CVE-2026-36813), picName in formDelwebAuthPic (CVE-2026-36811), and gotoUrl in formPortalAuth (CVE-2026-36810).
The common thread across all these vulnerabilities is their potential to lead to a Denial of Service (DoS) attack. By sending a crafted HTTP request, an attacker could trigger the buffer overflow, overwhelming the router's resources and rendering it inoperable. While no information is available regarding active exploitation in the wild or specific threat actors, the nature of these vulnerabilities means that a successful attack could disrupt network connectivity for users of the affected Tenda W15E devices.
All disclosed vulnerabilities specifically affect version v15.11.0.10 of the Tenda W15E router. While the disclosures do not explicitly mention a patch release, it is highly probable that Tenda will release a firmware update to address these issues. Users are strongly advised to check for and apply any available firmware updates from Tenda as soon as they become available to mitigate the risk of DoS attacks. Until a patch is applied, users should be aware of the potential for disruption.
This coordinated disclosure of ten buffer overflow vulnerabilities highlights a significant area of concern for users of the Tenda W15E router. The consistent pattern of DoS-inducing flaws across multiple functions suggests a need for thorough security audits of the device's firmware. Network administrators and end-users should prioritize updating their devices to the latest available firmware to protect against potential service disruptions.