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CVE-2026-67822 is a stack-based buffer overflow vulnerability in Tenda W6-S firmware version 1.0.0.4(510). The flaw is present in the /goform/wifiSSIDset endpoint, specifically in the formwrlSSIDset function, which uses sprintf to copy attacker-controlled GO and index parameters into a 64-byte stack buffer without enforcing length checks. Because the copy operation does not constrain input size, a remote attacker can overflow the stack by supplying oversized parameter values. The vulnerability may result in process crash, device instability, or potentially arbitrary code execution on the affected router.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a small, focused exploit research package for CVE-2026-67822 affecting the Tenda W6-S wireless access point firmware v1.0.0.4(510). It contains 4 files total: one README, two Python scripts, and one C source file. The main exploit capability is a confirmed remote denial-of-service against the web management service by sending an oversized GO parameter to POST /goform/wifiSSIDset, which reaches an unsafe sprintf() in formwrlSSIDset() and overflows a 64-byte stack buffer. The poc_dos.py script is the operational PoC: it probes the target over HTTP, sends the oversized POST body with GO, wl_radio, and index parameters, then re-probes to confirm that /bin/httpd has crashed. The exploit_conceptual.py script is not a full weaponized RCE exploit, but it is clearly exploit code: it generates cyclic patterns to empirically determine the offset to saved $ra on MIPS big-endian builds and can construct a payload that overwrites saved $ra with a chosen address. It intentionally omits shellcode, gadget addresses, and a complete post-hijack execution chain, so it is best characterized as conceptual/operational research support rather than a turnkey RCE. The fake_apmib.c file is auxiliary infrastructure, not the exploit itself: it is an LD_PRELOAD shim that fakes Tenda-specific initialization and configuration dependencies such as apmib_init(), ConnectCfm(), GetValue("lan.ip"), ioctl(SIOCGIFHWADDR), and connect(), allowing the vendor /bin/httpd binary to run inside a QEMU MIPS guest without physical hardware. This makes the repository useful both for reproducing the crash and for controlled emulation-based vulnerability research. Overall, the repository is a legitimate exploit PoC set with a working DoS reproducer, a conceptual control-flow-hijack skeleton for further research, and emulation support tooling.
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