Tenda W15E
CVE-2026-36815
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessReach W15E web management interface
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DeliveryCraft HTTP request with overlong hostname
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ExploitPOST to formSetNetCheckTools endpoint
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ExecutionOverflow stack buffer in httpd
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ImpactCrash management daemon or reboot device
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Buffer copy size validation
MITRE ATT&CK
1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Requires network reachability to the W15E HTTP management interface and the ability to send a POST request to the formSetNetCheckTools endpoint with an attacker-controlled hostname parameter; no authentication, user interaction, or non-default configuration toggle is required on the vulnerable endpoint itself. Exploitation is materially limited by the fact that the management interface is LAN-only by default - internet-based exploitation requires that an administrator has enabled remote/WAN management, and the only confirmed affected firmware is W15E v15.11.0.10. Impact is bounded to denial of service (CVSS C:N/I:N/A:H); there is no evidence in the available data that the overflow yields code execution. |
| Impact | Signals are mixed but lean toward low real-world priority despite the 7.5 High CVSS. The CVSS vector AV:N/AC:L/PR:N/UI:N/A:H correctly reflects that any reachable management interface can be crashed remotely without credentials, but C:N/I:N limits the outcome to availability loss only. EPSS is 0.01% (2nd percentile), the CVE is not on CISA KEV, and no public exploit is identified, indicating no observed mass exploitation. The dominant limiting factor is exposure: the W15E web UI is by default LAN-bound, so internet-facing impact requires that administrators have deliberately exposed management to the WAN - a non-default and inadvisable configuration. Treat as a patch-when-convenient availability bug for internal networks, and an urgent fix only where management is WAN-reachable. |
| Exploit ScenarioDerived | An attacker on the same LAN segment - or anywhere on the internet if the W15E's remote management has been enabled - sends a single crafted HTTP POST to the formSetNetCheckTools endpoint with an overlong hostname parameter, overflowing the stack buffer in httpd and crashing the management daemon. The router web UI becomes unreachable and, depending on the watchdog behavior, the device may reboot, disrupting Wi-Fi and routing for connected users. No public exploit code is identified, but the third-party research repository describes the vulnerable function, lowering the bar for a competent attacker to weaponize it. |
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Alert meAnalysisAIv1 – Jun 10, 2026
Denial of service in Tenda W15E router firmware v15.11.0.10 allows remote unauthenticated attackers to crash the device by sending a crafted HTTP request containing an oversized hostname parameter to the formSetNetCheckTools handler. The classic stack buffer overflow (CWE-120) currently shows no public exploit identified at time of analysis and a very low EPSS score of 0.01%, but the network-reachable management interface makes any exposed device trivially disruptable.
RemediationAI
No vendor-released patch identified at time of analysis; Tenda has not published an advisory or fixed firmware in the supplied references. Until Tenda issues updated W15E firmware, restrict access to the device's web management interface to a dedicated management VLAN or trusted admin workstations and confirm that remote/WAN management is disabled (this is the default and the single most effective compensating control, with the trade-off that legitimate remote administration is also blocked). Place the router behind a reverse proxy or upstream firewall that enforces a hostname-length limit on requests to /goform/formSetNetCheckTools (side effect: legitimate diagnostic requests with long hostnames will be rejected), and monitor for unexpected httpd restarts as an indicator of attempted exploitation. Track the vendor advisory page at tendacn.com for a fixed firmware release and apply it as soon as available.
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Technical ContextAI · show details
The Tenda W15E is an enterprise/SMB wireless router whose web-management firmware exposes a CGI-style endpoint named formSetNetCheckTools, typically used for diagnostic utilities such as ping or traceroute. The hostname parameter passed into this handler is copied into a fixed-size stack buffer without proper bounds checking, the canonical CWE-120 classic buffer overflow pattern that is endemic to Tenda's httpd binaries. The supplied research reference (github.com/xhh0124/SemVulLLM) indicates this issue was surfaced via semantic LLM-assisted vulnerability discovery against the W15E firmware image. The CPE string in the input is a placeholder (cpe:2.3:a:n/a:n/a:*) and does not authoritatively enumerate affected products - the description alone constrains scope to W15E v15.11.0.10.
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Endpoint is reachable over the network without authentication or user interaction; a single crafted request crashes httpd, yielding availability-only impact with no confidentiality or integrity loss.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
Shenzhen Tenda Technology Co., Ltd Tenda W15E v15.11.0.10 was discovered to contain a buffer overflow in the hostname parameter of the formSetNetCheckTools function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.
Executive ViewAI
Tenda W15E router firmware v15.11.0.10 is vulnerable to remote denial-of-service attacks that can completely crash the device, disrupting network availability for affected organizations. No vendor patch is currently available, requiring immediate protective measures to isolate the vulnerable management interface from untrusted networks.
No vendor-released patch identified at time of analysis. Interim mitigations include: (1) network segmentation restricting management interface access to administrative subnets; (2) disabling HTTP management access in favor of SSH or out-of-band management if available; (3) implementing rate limiting on HTTP requests if device firmware supports it; (4) monitoring router access logs for suspicious reconnaissance activity.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
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