EUVD-2026-51587
GHSA-3xxh-hm67-x74r
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
3DescriptionCVE.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.
AnalysisAI
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.
Technical ContextAI
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.
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.
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today