Tenda W15E
CVE-2026-36808
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 oversized webAuthUserInfo
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ExploitPOST to formAddWebAuthUser endpoint
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ExecutionTrigger buffer overflow in httpd
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PersistCrash router web service / reboot device
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ImpactNetwork availability lost for connected clients
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 | Attacker must be able to reach the W15E web management HTTP interface and submit a POST request to the formAddWebAuthUser endpoint with an oversized webAuthUserInfo parameter; CVSS PR:N and UI:N indicate no credentials and no user interaction are required to reach the buffer-overflow code path. Realistic exposure is limited by deployment: the management interface is bound to the LAN by default, so internet-based exploitation requires that the operator has enabled WAN-side remote web management or otherwise exposed TCP/80-443 on the router's WAN IP. The vulnerability is specific to Tenda W15E firmware v15.11.0.10 and only causes denial of service (no confidentiality or integrity impact per the CVSS vector). |
| Impact | Signals point to a real but narrow risk. CVSS 7.5 (AV:N/AC:L/PR:N/UI:N/C:N/I:N/A:H) reflects pure availability impact reachable over the network without authentication - consistent with the description. EPSS at 0.02% (4th percentile) and absence from CISA KEV indicate no observed mass exploitation, and the only public reference is an academic-style PoC repository (SemVulLLM) rather than a weaponized exploit. The realistic exposure depends on whether the W15E web UI is reachable from the WAN; default Tenda deployments expose it only on LAN, which sharply limits remote-internet exploitation despite the AV:N rating. Note also that the CPE record is a placeholder ('n/a:n/a'), so automated vulnerability scanners may fail to match affected devices - defenders should not rely on CPE-based detection alone. |
| Exploit ScenarioDerived | An attacker on the same LAN as the router (or on the internet if remote web management is enabled) sends a single HTTP POST to the formAddWebAuthUser endpoint with an oversized webAuthUserInfo parameter value. The vulnerable handler copies the value into a fixed-size buffer, corrupting memory and crashing the embedded httpd process or rebooting the router, knocking all clients off the network until it recovers. A research-style PoC exists in a public GitHub repository (SemVulLLM), but no weaponized in-the-wild exploit has been 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 webAuthUserInfo parameter of the formAddWebAuthUser function. EPSS is extremely low at 0.02% and no public exploit identified at time of analysis beyond a research repository, though the affected component is the web administration interface of a SOHO/SMB router.
RemediationAI
No vendor-released patch identified at time of analysis - Tenda has not published an advisory or fixed firmware in the supplied references. As compensating controls, restrict access to the router's web management interface to trusted LAN administrative hosts only and ensure WAN-side remote management is disabled (which is the default for most Tenda models but should be verified in System Tools / Remote Web Management); this blocks the network-reachable attack surface at the cost of requiring on-LAN access for administration. Place the device behind an upstream firewall or ACL that drops inbound TCP/80 and TCP/443 to the router's WAN IP, and monitor the device for unexpected reboots indicative of httpd crashes. If the device is end-of-life or no firmware update is forthcoming, plan migration to a supported model, and meanwhile consult https://github.com/xhh0124/SemVulLLM/tree/main/W15E/formAddWebAuthUser for the exact crashing payload pattern to build IDS/IPS signatures.
Affects your stack
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Technical ContextAI · show details
The flaw resides in formAddWebAuthUser, a handler in the Tenda W15E web management binary (typically the httpd/web server running on the router) that processes the webAuthUserInfo HTTP parameter used to add a web-authentication user. The root cause is CWE-120 (Classic Buffer Overflow / Buffer Copy without Checking Size of Input): the handler copies attacker-controlled input into a fixed-size stack or global buffer without bounds checking, corrupting adjacent memory and crashing the embedded httpd process. The W15E is an enterprise/SMB Wi-Fi router from Shenzhen Tenda; CPE data in NVD is a placeholder ('cpe:2.3:a:n/a:n/a') and does not formally enumerate the affected product, which is a recurring NVD-quality issue for Tenda CVEs from third-party MITRE submissions.
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable HTTP endpoint, no auth or interaction required, single crafted request triggers crash; only availability impact, no confidentiality or integrity effect.
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 webAuthUserInfo 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 router firmware v15.11.0.10 contains a denial-of-service vulnerability in the web administration interface that allows remote unauthenticated attackers to crash affected devices. This impacts network availability for SOHO and SMB organizations relying on these routers for connectivity, with particular risk to business continuity if administrative access is needed during an outage.
No vendor-released patch identified at time of analysis. Restrict network access to the web administration interface via firewall rules and disable remote administrative access where possible. Monitor device uptime and implement network redundancy to mitigate impact of device unavailability.
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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