Tenda W3 Router
CVE-2026-36771
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessReach router HTTP admin interface on LAN
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DeliveryCraft oversized wl_radio parameter payload
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ExploitPOST request to formwrlSSIDset endpoint
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ExecutionOverflow stack buffer in form handler
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PersistCrash HTTP daemon or reboot router
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ImpactWireless service denial for all 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 | The attacker must be able to reach the Tenda W3's HTTP management interface (formwrlSSIDset endpoint) over the network - typically this means LAN-side access on firmware v1.0.0.3(2204) of the W3 router, since remote WAN management is generally off by default. No authentication, user interaction, or special non-default configuration is indicated by the CVSS vector (PR:N/UI:N/AC:L). Exploitation is limited to denial-of-service (the CVSS vector shows C:N/I:N/A:H), and is constrained to deployments running the specific affected firmware build with the management interface reachable from the attacker's network position. |
| Impact | The CVSS vector AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H indicates a network-reachable, unauthenticated, low-complexity attack with availability-only impact - consistent with a remote crash rather than code execution. Real-world risk depends heavily on exposure: Tenda W3 management interfaces are typically reachable only on the LAN by default, so internet-wide mass exploitation is unlikely unless remote management is enabled. EPSS and SSVC data were not provided, and the vulnerability is not listed in CISA KEV, so this should be treated as a meaningful local-network DoS issue rather than a top-priority emergency. The presence of a GitHub research repository indicates technical detail is public, lowering the barrier to producing a working DoS payload, but no evidence of in-the-wild exploitation is available. |
| Exploit ScenarioDerived | An attacker on the same LAN (for example, a guest Wi-Fi user or a compromised IoT device on the network) sends a crafted HTTP POST request to the router's formwrlSSIDset endpoint with an oversized wl_radio parameter value. The stack buffer overflows, corrupting the HTTP daemon's stack frame and crashing the management service or rebooting the router, knocking all clients off the wireless network. Public research material referenced on GitHub lowers the effort needed to reproduce the crash, though no weaponized public exploit was identified. |
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Alert meAnalysisAIv1 – Jun 09, 2026
Denial-of-service in the Tenda W3 Wireless Router (firmware v1.0.0.3(2204)) allows remote unauthenticated attackers to crash the device by sending crafted input to the wl_radio parameter of the formwrlSSIDset function, triggering a stack-based buffer overflow. Publicly available exploit research exists in a GitHub repository, but no public exploit identified for weaponized use at time of analysis and the issue is not listed in CISA KEV. The CVSS 7.5 score reflects high availability impact without confidentiality or integrity loss.
RemediationAI
No vendor-released patch identified at time of analysis. Until Tenda publishes updated firmware for the W3, restrict access to the router's web management interface by ensuring remote/WAN management is disabled (this is typically the default but should be verified), and segment the management VLAN so only trusted administrative hosts can reach the HTTP admin port - the trade-off is reduced convenience for remote administration. Consider replacing the device with a supported model if it is end-of-life, and monitor https://github.com/xhh0124/SemVulLLM/tree/main/W3/formwrlSSIDset and the Tenda support site for a fixed firmware release. As a stronger compensating control, place the router behind a properly secured upstream firewall and disable Wi-Fi SSID self-service portals or any feature that allows untrusted clients to reach formwrlSSIDset.
Affects your stack
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Technical ContextAI · show details
The flaw resides in the formwrlSSIDset HTTP form handler exposed by the router's embedded web management interface, which processes wireless SSID configuration parameters including wl_radio. The root cause is CWE-121 (Stack-based Buffer Overflow): the handler copies attacker-controlled wl_radio input into a fixed-size stack buffer without proper bounds checking, corrupting the saved return address or adjacent stack frame data and crashing the HTTP daemon. Tenda SOHO routers commonly run a BusyBox/Linux firmware with custom CGI binaries (httpd/goahead-style) where similar overflow patterns have been disclosed across the Tenda product line. The supplied CPE string is a placeholder ('n/a'), so the authoritative affected product identifier comes from the description text rather than NVD CPE data.
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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 W3 Wireless Router v1.0.0.3(2204) was discovered to contain a stack overflow in the wl_radio parameter of the formwrlSSIDset function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted input.
Executive ViewAI
The Tenda W3 Wireless Router (firmware v1.0.0.3(2204)) is vulnerable to remote denial-of-service attacks that can crash the device, disabling wireless network connectivity for all connected users. The vulnerability can be exploited by unauthenticated remote attackers and no vendor patch is currently available. Organizations must immediately assess their exposure and implement containment measures to prevent network outages.
No vendor-released patch identified at time of analysis. Interim mitigations: (1) Implement firewall rules to restrict access to device management interfaces; (2) Disable remote administration and unnecessary services on affected routers; (3) Segment affected routers to isolated network zones away from critical infrastructure; (4) Deploy network-based monitoring for exploitation attempts; (5) Plan hardware replacement with alternative vendors or updated device models.
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.
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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