Tenda W15E
CVE-2026-36816
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessIdentify exposed Tenda W15E web interface
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DeliveryCraft oversized wewifiWhiteUserInfo HTTP request
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ExploitSend POST to formAddWewifiWhiteUser endpoint
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ExecutionOverflow fixed-size buffer in handler
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PersistCrash httpd/management process
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ImpactRouter becomes unavailable
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 | Reachability to the Tenda W15E web management interface (typically TCP/80 or TCP/443) running firmware v15.11.0.10, and the ability to send an HTTP request to the formAddWewifiWhiteUser handler with a long wewifiWhiteUserInfo parameter. The CVSS vector lists PR:N (no privileges), suggesting the endpoint is reachable pre-authentication, but this is inconsistent with typical router admin endpoints - operators should verify whether the formAddWewifiWhiteUser handler requires a valid session in their deployment, as authentication enforcement would significantly reduce exposure. Limiting factors: the device must be reachable on its HTTP management port from the attacker's position, and only the W15E hardware/firmware combination is confirmed vulnerable. |
| Impact | The CVSS 3.1 score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) reflects a network-reachable, unauthenticated, no-interaction availability-only impact - consistent with a DoS. EPSS of 0.02% (4th percentile) and the absence of CISA KEV listing indicate no widespread exploitation. The reference points only to a research repository (SemVulLLM) rather than a weaponized PoC, suggesting this was surfaced by automated vulnerability discovery research rather than observed in attacks. Real-world risk is moderate-to-low for internet-exposed W15E devices but elevated when the web admin interface is reachable from untrusted networks; impact is limited to availability (device reboot/hang) with no code execution or data disclosure claimed in the description. CVSS PR:N appears inconsistent with typical router admin endpoints - independent verification is warranted, since formAddWewifiWhiteUser may sit behind authentication in default configurations. |
| Exploit ScenarioDerived | An attacker on the same network segment as the W15E (or on the internet, if the web admin port is WAN-exposed) sends a single crafted HTTP POST to the formAddWewifiWhiteUser endpoint containing an overly long wewifiWhiteUserInfo value, causing the router's httpd to crash and the management plane - and potentially wireless services - to become unavailable until reboot. The referenced GitHub research repository documents the vulnerable function but no turnkey weaponized PoC is published in the listed references. |
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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 overflows a buffer in the wewifiWhiteUserInfo parameter handled by the formAddWewifiWhiteUser function. No public exploit identified at time of analysis, though a third-party research repository on GitHub references the vulnerable function, and EPSS is very low (0.02%, 4th percentile).
RemediationAI
No vendor-released patch identified at time of analysis - Tenda has not published an advisory in the available references. Until a firmware update for the W15E is released, restrict access to the device's HTTP management interface so it is not reachable from the WAN or any untrusted LAN segment by placing it behind a management VLAN and ACLs (side effect: legitimate remote admin will require VPN). Disable or block external access to the WiFi whitelist endpoint specifically if the device supports per-feature ACLs, and monitor the httpd process for unexpected restarts. Track Tenda's product support page for W15E firmware newer than 15.11.0.10 and apply it immediately upon release; consider replacing end-of-life Tenda SMB hardware if the vendor does not respond, since multiple historic Tenda buffer overflows have gone unpatched.
Affects your stack
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Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
The Tenda W15E is an enterprise/SMB wireless router. The flaw is a classic CWE-120 classic buffer copy without checking size of input (buffer overflow) in the device's HTTP-based web management interface. The formAddWewifiWhiteUser handler - part of a MAC/whitelist feature for WiFi access control - copies the user-supplied wewifiWhiteUserInfo parameter into a fixed-size stack or heap buffer without proper length validation, causing memory corruption that crashes the httpd/web management process. The CPE entry from MITRE is a placeholder ('cpe:2.3:a:n/a:n/a:*'), so version coverage beyond v15.11.0.10 must be inferred from the description alone.
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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 handler with low complexity; PR:L because router admin endpoints normally require a session, and impact is availability-only (DoS, no code execution claimed).
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 wewifiWhiteUserInfo parameter of the formAddWewifiWhiteUser 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 remotely exploitable denial-of-service vulnerability (CVE-2026-36816) allowing unauthenticated attackers to crash affected devices. Organizations deploying these routers face potential network interruptions without mitigation. No vendor patch is currently available, requiring immediate inventory and network access controls.
Restrict unauthenticated HTTP access to router management interface at the firewall; implement rate-limiting and request-size validation on inbound traffic; disable wewifiWhiteUser feature if operationally feasible; maintain network redundancy to minimize outage impact from device crashes; monitor for suspicious HTTP requests with malformed wewifiWhiteUserInfo parameters.
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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