EUVD-2026-51587
GHSA-3xxh-hm67-x74r
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessGain LAN/Wi-Fi network access to router
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DeliverySend crafted POST to /goform/wifiSSIDset
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ExploitOverflow 64-byte stack buffer via oversized GO/index
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ExecutionOverwrite saved return address
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ImpactExecute arbitrary code or crash device
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 the ability to send an HTTP request to the /goform/wifiSSIDset endpoint of the router's web management server with an oversized 'GO' or 'index' parameter; the specific trigger is the formwrlSSIDset function's unbounded sprintf into a 64-byte stack buffer. The primary limiting factor is network position: the management HTTP interface on Tenda W6-S is normally bound to the LAN/wireless side, so an attacker generally must already be on the local network (or the device must have remote WAN management enabled) - it is not reliably exploitable from the arbitrary internet despite the AV:N rating. The description states no authentication requirement, and the CVSS vector encodes PR:N, but auth prerequisites are not explicitly confirmed by a vendor advisory. Exploitation is limited to the affected firmware 1.0.0.4(510) build. |
| Impact | The NVD CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N, C:H/I:H/A:H = 9.8 Critical) rates this as trivially exploitable and maximally impactful. However, several signals should temper prioritization: no EPSS score was provided, no KEV listing exists, and a working POC/exploit is not confirmed - only a technical write-up documenting the flaw is public. In practice these router management endpoints are usually reachable only from the LAN/Wi-Fi side rather than the WAN, so the AV:N rating may overstate real-world remote reach - many Tenda goform endpoints are LAN-limited, which is a meaningful limiting factor not captured by the base score. There is also a conflict worth verifying: the description and CPE are effectively 'n/a' for vendor/product mapping (CPE string is malformed 'cpe:2.3:a:n/a:n/a:*'), so affected-scope confirmation relies on the reporter's write-up rather than a vendor advisory. Net: genuinely critical on the device itself, but real-world risk is bounded by network position and the absence of confirmed mass exploitation. |
| Exploit ScenarioDerived | An attacker with access to the router's LAN or Wi-Fi network sends a crafted HTTP POST to /goform/wifiSSIDset containing an overlong 'GO' or 'index' parameter. The formwrlSSIDset handler copies it into a 64-byte stack buffer via sprintf, overwriting the return address and either crashing the device (denial of service) or, with a tailored payload, executing attacker-controlled code with the router's privileges. A public technical write-up documenting the overflow lowers the barrier to developing a functional exploit. |
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Alert meAnalysisAIv1 – Jul 31, 2026
Stack-based buffer overflow in the Tenda W6-S wireless router (firmware 1.0.0.4(510)) lets remote attackers corrupt stack memory by sending oversized 'GO' and 'index' parameters to the /goform/wifiSSIDset endpoint, where the formwrlSSIDset handler copies them into a fixed 64-byte buffer via unbounded sprintf. Successful exploitation can crash the device or achieve arbitrary code execution with full impact to confidentiality, integrity, and availability. Publicly available exploit code exists in the form of a detailed technical write-up, though there is no public exploit identified as weaponized and no confirmed active exploitation.
RemediationAI
No vendor-released patch identified at time of analysis; Tenda has not published a fixed firmware version for this issue in the available data. Because no patched build is confirmed, apply compensating controls: restrict access to the router's web management interface to trusted administrative hosts only and ensure it is never exposed to the WAN/internet (disable any remote-management option), which prevents external reach to /goform/wifiSSIDset at the cost of losing off-LAN administration; segment the router's management VLAN/SSID away from untrusted or guest wireless clients to limit who can reach the endpoint; and monitor for and consider replacing the device if it is end-of-life, since consumer Tenda models often receive no timely fixes. Track the researcher advisory (https://github.com/Tristerjh/Tenda/blob/main/Tenda_W6-S_GO_overflow.md) and the NVD page (https://nvd.nist.gov/vuln/detail/CVE-2026-67822) for a vendor firmware update and apply it immediately once released.
Affected VersionsENISA
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Technical ContextAI · show details
The affected component is the embedded HTTP management server (typically an httpd/goform CGI-style handler) on the Tenda W6-S SOHO Wi-Fi router. The root cause is CWE-121 (stack-based buffer overflow): the formwrlSSIDset function uses sprintf() to format user-supplied 'GO' and 'index' request parameters into a 64-byte stack-allocated buffer with no length validation or bounds checking. Because sprintf performs no truncation, attacker-controlled input longer than the buffer overwrites adjacent stack memory, including saved registers and the return address on these MIPS/ARM-based embedded devices. This is characteristic of the many /goform/* endpoints in Tenda firmware that pass raw request parameters directly into fixed-size stack buffers.
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Router web-management endpoint is normally reachable only from the LAN/Wi-Fi side, so AV:A rather than AV:N; no auth or bounds check gives PR:N/AC:L, and memory-corruption RCE yields full C/I/A:H.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
Tenda W6-S 1.0.0.4(510) contains a stack-based buffer overflow vulnerability in the /goform/wifiSSIDset endpoint. The function formwrlSSIDset uses sprintf to copy user-controlled 'GO' and 'index' parameters into a 64-byte stack buffer without length restriction, leading to stack overflow.
Executive ViewAI
Tenda W6-S routers running firmware 1.0.0.4(510) contain a critical remote vulnerability that enables attackers to disable network infrastructure or gain unrestricted administrative access; any organization operating this router model faces immediate risk to network uptime and data security. Publicly available exploit code exists, eliminating the barrier to attack. Remediation must begin within 24 hours.
No vendor-released patch identified at time of analysis. Compensating controls include: (1) firewall rules restricting network access to the vulnerable /goform/wifiSSIDset endpoint, (2) disabling remote management and UPnP where operations permit, (3) network segmentation isolating affected routers from critical systems, and (4) continuous monitoring of Tenda advisories for firmware updates.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
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.
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