Tenda W15E
CVE-2026-36811
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessReach W15E web admin interface
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DeliveryCraft HTTP request with oversized picName
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ExploitSend to formDelwebAuthPic endpoint
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ExecutionOverflow fixed-size buffer in handler
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ImpactCrash httpd process and disrupt management/captive-portal
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 have network reachability to the Tenda W15E's HTTP management interface (the formDelwebAuthPic endpoint within the embedded web server) on firmware v15.11.0.10; no authentication, user interaction, or special configuration is required per the CVSS vector (AV:N/AC:L/PR:N/UI:N). Exploitation is LIMITED by: (1) the management interface is typically LAN-bound by default, so internet exposure requires explicit WAN-management enablement or port forwarding; (2) only firmware 15.11.0.10 is explicitly named - other builds may or may not be vulnerable; (3) impact is constrained to availability, with no path to code execution or data disclosure confirmed in the description. |
| Impact | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/A:H) drives the 7.5 High score purely on availability impact - no confidentiality or integrity loss - which is consistent with a DoS-only buffer overflow that crashes the web management daemon rather than achieving code execution. EPSS is extremely low at 0.02% (4th percentile), the CVE is NOT on the CISA KEV list, and the only reference is a third-party research repository (SemVulLLM) rather than a vendor advisory or weaponized exploit, indicating no observed exploitation activity. The realistic risk is moderate-to-low for most deployments: an attacker who can reach the management interface can knock the router offline, but Tenda W15E web admin is typically bound to LAN, so internet-exposed risk depends on misconfiguration. Note also that while CWE-120 buffer overflows can sometimes be escalated to RCE, the CVSS vector and description scope this specifically to DoS - RCE potential is not confirmed. |
| Exploit ScenarioDerived | An attacker on the same LAN segment as the W15E (or any network with reachability to the device's web admin port) sends a single HTTP POST/GET to the formDelwebAuthPic endpoint with an overlong picName parameter, triggering the buffer overflow and crashing the httpd daemon. The router's management plane becomes unresponsive and, depending on watchdog behavior, may reboot or require manual power-cycling, disrupting authenticated Wi-Fi captive-portal sessions and network administration. A repository-hosted proof-of-concept artifact exists at the researcher's GitHub but no weaponized exploit is publicly indexed. |
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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 with an oversized picName parameter to the formDelwebAuthPic handler. No public exploit identified at time of analysis, and EPSS rates real-world exploitation probability at just 0.02% (4th percentile), but the affected SOHO/SMB router class is a frequent target once weaponized PoCs emerge.
RemediationAI
No vendor-released patch identified at time of analysis; Tenda has not published an advisory in the supplied references. Until a fixed firmware build is released, restrict access to the W15E web management interface (typically TCP/80 and TCP/443) to a dedicated management VLAN or trusted admin workstations using ACLs on upstream switches/firewalls, and ensure the WAN-side management interface is disabled (side effect: remote admin via WAN will no longer function, requiring on-site or VPN access). Monitor the Tenda support site (https://www.tendacn.com) for a firmware update superseding 15.11.0.10 and apply it once available; if the device is end-of-life, plan replacement, since unpatched embedded HTTP services are routinely chained into botnets. The single reference https://github.com/xhh0124/SemVulLLM/tree/main/W15E/formDelwebAuthPic documents the bug location but is not a vendor remediation source.
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Technical ContextAI · show details
The Tenda W15E is an enterprise-grade wireless access controller/router. The vulnerable formDelwebAuthPic function is part of the device's web-based management interface (httpd/goahead-style embedded web server commonly used in Tenda firmware) and handles deletion of web authentication pictures. The root cause is CWE-120 (Classic Buffer Overflow / Buffer Copy without Checking Size of Input): the picName HTTP parameter is copied into a fixed-size stack or heap buffer without bounds validation, corrupting adjacent memory and causing the httpd process to crash. The supplied CPE string (cpe:2.3:a:n/a:n/a:*) is a malformed placeholder rather than a proper vendor/product CPE, so authoritative product matching must rely on the description.
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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 httpd endpoint with no auth or user interaction; crafted parameter reliably crashes the daemon, 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 picName parameter of the formDelwebAuthPic 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 an unauthenticated denial-of-service vulnerability allowing remote attackers to crash affected devices, creating network outages for SOHO and SMB deployments. No vendor patch is currently available, and the affected router class is commonly deployed in branch offices and remote sites, making this a material business continuity risk despite the 0.0% EPSS score. Organizations must implement interim controls immediately to prevent network disruptions while awaiting vendor remediation.
No vendor-released patch identified at time of analysis. Deploy: (1) Network segmentation-isolate affected routers to trusted internal segments only; (2) HTTP-level rate limiting via upstream firewall or WAF to block oversized picName parameter requests; (3) Access control lists restricting administrative interfaces to authorized internal IP ranges; (4) Continuous monitoring for unexpected device reboots or outages; (5) Redundancy-configure failover routing to minimize impact if devices are crashed; (6) Traffic inspection-log and alert on HTTP requests exceeding normal parameter sizes to affected devices.
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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