EUVD-2025-18197
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
4Description
Buffer Overflow vulnerability in Tenda AC6 v.15.03.05.16 allows a remote attacker to cause a denial of service via the oversized schedStartTime and schedEndTime parameters in an unauthenticated HTTP GET request to the /goform/openSchedWifi endpoint
Analysis
A buffer overflow vulnerability exists in Tenda AC6 router firmware version 15.03.05.16 that allows unauthenticated remote attackers to trigger a denial of service condition by sending oversized parameters (schedStartTime and schedEndTime) to the /goform/openSchedWifi endpoint. The vulnerability is network-accessible without authentication or user interaction, making it trivially exploitable for DoS attacks against affected routers. While the CVSS score indicates high severity (7.5), the actual impact appears limited to availability (DoS only), with no confirmed code execution or data disclosure capability.
Technical Context
This vulnerability is a classic CWE-120 (Buffer Over-read) occurring in the HTTP request handling layer of Tenda AC6's web-based management interface. The /goform/openSchedWifi endpoint processes schedule-related parameters without proper input validation or bounds checking on the schedStartTime and schedEndTime fields. Tenda AC6 (CPE: cpe:2.3:h:tenda:ac6:-:*:*:*:*:*:*:*) is a consumer Wi-Fi router running proprietary firmware with an embedded HTTP server that parses these parameters directly into fixed-size stack or heap buffers. The firmware version 15.03.05.16 fails to implement adequate length validation before copying user-supplied data, allowing attackers to overflow adjacent memory structures. The endpoint is accessible over HTTP without CSRF tokens or session authentication, exposing the vulnerability to any network-adjacent attacker.
Affected Products
AC6 (['15.03.05.16'])
Remediation
patch: Apply latest firmware patch when available from Tenda workaround: Disable WAN-accessible HTTP administration; configure access control lists (ACLs) to restrict /goform/* endpoints to internal network only mitigation: Implement WAF or IPS rule matching: User-Agent or POST/GET to /goform/openSchedWifi with Content-Length > threshold monitoring: Enable router logging and alert on 4xx/5xx errors to /goform/* paths
Priority Score
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External POC / Exploit Code
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