Tenda FH451
CVE-2026-36785
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessIdentify reachable Tenda FH451 web UI
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DeliveryCraft HTTP request with oversized page parameter
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ExploitSend request to fromDhcpListClient endpoint
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ExecutionOverflow stack buffer in httpd process
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ImpactCrash router and disconnect clients
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Stack buffer bounds checking
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 | Exploitation requires network reachability to the Tenda FH451's HTTP management interface on firmware V1.0.0.9 and the ability to send a crafted HTTP request with an oversized page parameter to the fromDhcpListClient endpoint; no authentication, user interaction, or special privileges are required (CVSS PR:N/UI:N). Exploitation is limited by exposure of the web UI - by default Tenda routers bind admin HTTP to the LAN, so an internet-based attacker can only reach the device when WAN-side/remote management has been explicitly enabled, when the device sits directly on a public IP without an upstream firewall, or when the attacker is already on the internal network (compromised endpoint, guest Wi-Fi, malicious insider). |
| Impact | The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H produces a 7.5 score driven entirely by high availability impact reachable over the network with no authentication or user interaction - meaning any attacker who can reach the router's HTTP management interface can crash it. Real-world risk is moderated by several factors: EPSS is 0.01% (3rd percentile), there is no CISA KEV listing, and the impact is limited to DoS (C:N/I:N), not code execution or data disclosure. The references point to a SemVulLLM research repository on GitHub rather than a weaponized exploit, suggesting the issue surfaced through automated/LLM-assisted vulnerability discovery rather than active attacker tooling. The most significant unknown is exposure: if the web UI is bound only to the LAN (typical default), the attack surface is internal; if WAN-side management is enabled, the device is internet-reachable and the AV:N rating is fully realized. |
| Exploit ScenarioDerived | An attacker on the same LAN - or on the internet if WAN management is enabled - sends a single HTTP request to the router's management endpoint with an oversized page parameter targeting fromDhcpListClient, overflowing a stack buffer and crashing the httpd process or rebooting the device. Repeated requests keep the router unavailable, disconnecting all downstream clients. Proof-of-concept material appears to be published in the public SemVulLLM GitHub repository, lowering the effort required to reproduce the crash. |
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Alert meAnalysisAIv1 – Jun 08, 2026
Denial of service in Tenda FH451 V1.0.0.9 routers allows remote unauthenticated attackers to crash the device by sending a crafted HTTP request that triggers a stack overflow in the page parameter handler of the fromDhcpListClient function. EPSS exploitation probability is very low (0.01%, 3rd percentile) and no public exploit identified at time of analysis, though proof-of-concept artifacts appear to be hosted in a public GitHub research repository. The flaw is not listed in CISA KEV.
RemediationAI
No vendor-released patch identified at time of analysis; Tenda has not published an advisory in the supplied references. Until a firmware update for the FH451 is released, restrict access to the router's web management interface by disabling remote/WAN management entirely and limiting LAN-side access to a dedicated management VLAN or specific admin IP addresses via ACLs - this directly removes the network reachability required by the AV:N vector at the cost of administrator convenience. Monitor the Tenda support portal (https://www.tendacn.com) for an FH451 firmware release superseding V1.0.0.9, and consult the researcher repository at https://github.com/xhh0124/SemVulLLM/tree/main/FH451/fromDhcpListClient_0 for additional technical detail. For high-exposure deployments, consider replacing end-of-support consumer-grade hardware with devices that receive regular security maintenance, since Tenda SMB routers have a long history of similar unpatched buffer overflows.
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Technical ContextAI · show details
The vulnerability lives in the web management interface of the Tenda FH451, a SOHO-class enterprise/SMB router from Shenzhen Tenda Technology. The fromDhcpListClient function is one of the handlers in the device's embedded HTTP server (typically the httpd/goahead-derived binary common to Tenda firmware) that processes administrative pages such as the DHCP client list. CWE-121 (Stack-based Buffer Overflow) indicates that the page parameter received via HTTP is copied into a fixed-size stack buffer without proper length validation, corrupting the stack frame and crashing the binary. Because consumer/SMB router firmware typically lacks modern mitigations (ASLR, stack canaries are inconsistently applied on MIPS/ARM embedded targets), stack overflows in Tenda devices have historically been escalatable beyond DoS, although this specific CVE is scored only for availability impact.
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from Vendor (mitre) · only source for this CVE.
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
Shenzhen Tenda Technology Co., Ltd Tenda FH451 V1.0.0.9 was discovered to contain a stack overflow in the page parameter of the fromDhcpListClient function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.
Executive ViewAI
Organizations deploying Tenda FH451 routers (firmware 1.0.0.9) face remote denial-of-service risk with publicly available exploit code-unauthenticated attackers can crash devices and disrupt network connectivity. No vendor patch is available, creating extended exposure and necessitating alternative remediation approaches.
Implement network segmentation to restrict HTTP access to affected routers; deploy rate-limiting on inbound HTTP requests to these devices; restrict management interface access to authorized networks only; enable comprehensive logging and alerting for unexpected device reboots or service interruptions; isolate affected routers from untrusted network segments until vendor patch availability is confirmed.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
GitHub
VulDB
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.
A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than it was allocated to hold.
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
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