Tenda W15E
CVE-2026-36807
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessIdentify exposed W15E web UI
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DeliveryCraft oversized webAuthUserPwd HTTP POST
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ExploitSend request to formAddWebAuthUser endpoint
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ExecutionOverflow fixed-size buffer in httpd
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PersistCrash management/router process
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ImpactSustain DoS until power cycle
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 | The attacker must be able to reach the W15E HTTP management interface and reach the formAddWebAuthUser handler (the endpoint backing the web-authentication user provisioning feature); the target must be running firmware v15.11.0.10. No authentication is required per the CVSS vector (PR:N) and no user interaction is needed (UI:N), so a single crafted HTTP request to the vulnerable goform endpoint suffices. Exploitation is limited in practice by whether the management interface is exposed beyond the LAN - in default deployments where WAN/remote management is disabled, an attacker must already be on an adjacent network - and by the impact ceiling of denial of service only (no code execution or data disclosure is claimed in the description). |
| Impact | Signals are mixed but consistent for a DoS-class router bug: CVSS 7.5 (AV:N/AC:L/PR:N/UI:N/A:H) indicates trivial remote exploitation against the management interface, yet EPSS is only 0.01% (2nd percentile) and the vulnerability is not on CISA KEV, with no public exploit identified at time of analysis. The single linked artifact is a research repository (SemVulLLM) likely containing a PoC trigger, but no weaponized exploit or campaign reporting is available. Real-world risk is gated almost entirely by exposure of the W15E web UI: if the admin interface is reachable only on the LAN (typical, vendor-recommended), risk is low; if exposed to the WAN/Internet, an unauthenticated attacker can repeatedly crash the device, denying network access to all downstream users. Note also that CVSS AV:N assumes the web UI is network-reachable from the attacker - many deployments restrict this to the LAN, which would in practice reduce the effective attack vector to AV:A. |
| Exploit ScenarioDerived | An attacker with network reach to the W15E's web UI (for example, via an Internet-exposed management port or from inside the LAN) sends a single crafted HTTP POST to the formAddWebAuthUser endpoint with an oversized webAuthUserPwd value, overflowing the destination buffer and crashing the device's web/management daemon (and in many embedded routers the supervisor process, taking the whole device offline). Repeated requests sustain the outage, denying Wi-Fi and routing services to all downstream users until the device is power-cycled. A research PoC appears to exist in the linked SemVulLLM repository, but no weaponized exploit or active campaign is reported. |
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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 that triggers a buffer overflow in the webAuthUserPwd parameter of the formAddWebAuthUser handler. CVSS 7.5 reflects the network-reachable, no-auth attack path with high availability impact but no confidentiality or integrity loss, and EPSS is very low (0.01%) with no public exploit identified at time of analysis.
RemediationAI
No vendor-released patch identified at time of analysis; Tenda has not published an advisory in the supplied references. As compensating controls, restrict access to the W15E web management interface to trusted LAN segments only by disabling remote/WAN management in the device settings (trade-off: administrators lose remote configuration capability and must be on-LAN or VPN'd in), place the device behind an ACL or firewall rule that blocks inbound HTTP/HTTPS to its admin port from untrusted networks, and monitor for repeated POST requests to /goform/formAddWebAuthUser as a crash precursor. Operators should also subscribe to Tenda security bulletins and plan a firmware upgrade as soon as a fixed build is released; in higher-risk deployments, consider replacing the device with a model under active security support. See the research reference at https://github.com/xhh0124/SemVulLLM/tree/main/W15E/formAddWebAuthUser for trigger details useful in building detection signatures.
Affects your stack
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Technical ContextAI · show details
The Tenda W15E is a SMB/enterprise wireless access router whose web administration interface exposes the formAddWebAuthUser endpoint, used to add web-authentication users for captive-portal style access control. The flaw is a classic CWE-120 unbounded buffer copy: input supplied through the webAuthUserPwd parameter is written into a fixed-size stack/heap buffer without length validation, corrupting adjacent memory and causing the httpd/web server process on the device to crash. The CPE provided by the source is the placeholder 'cpe:2.3:a:n/a:n/a:*' rather than an authoritative Tenda CPE, so the affected scope must be derived from the description text (W15E firmware 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
Unauthenticated single crafted HTTP request to a network-reachable management endpoint causes only device crash, so AV:N/AC:L/PR:N/UI:N with availability-only impact.
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 webAuthUserPwd parameter of the formAddWebAuthUser function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.
Executive ViewAI
Tenda W15E routers (firmware v15.11.0.10) are vulnerable to a remote denial-of-service attack that requires no authentication, allowing attackers to crash affected devices via malformed HTTP requests. No public exploit identified at time of analysis, but the unauthenticated attack vector creates operational risk for organizations relying on this hardware for network connectivity. Organizations should inventory affected devices and develop replacement or mitigation strategies.
No vendor-released patch identified at time of analysis. Interim mitigations: implement network segmentation and firewall rules to restrict HTTP access to device management interfaces; enable security logging on upstream devices; isolate affected routers from critical network infrastructure; monitor for abnormal HTTP requests to the formAddWebAuthUser parameter; plan device replacement pending vendor patch availability.
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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