CVE-2026-36823
Description
Tenda W20E v15.11.0.6 has a buffer overflow in formAddWebAuthUser via webAuthUserInfo, leading to Denial of Service.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Tenda W20E v15.11.0.6 has a buffer overflow in formAddWebAuthUser via webAuthUserInfo, leading to Denial of Service.
Vulnerability
A buffer overflow vulnerability exists in the formAddWebAuthUser function of Shenzhen Tenda Technology Co., Ltd Tenda W20E version 15.11.0.6. The vulnerability is triggered by the webAuthUserInfo parameter, which is processed by websGetVar and then copied using strncpy without proper bounds checking. This affects Tenda W20E V15.11.0.6 [1].
Exploitation
An attacker can exploit this vulnerability by sending a crafted HTTP request to the formAddWebAuthUser CGI endpoint. The request must include a webAuthUserInfo parameter with a value that exceeds the buffer's capacity, for example, a string of 500 or more characters followed by a newline character. This can be achieved by setting webAuthUserInfo to a long string like a*888 + '\n'*50 [1].
Impact
Successful exploitation of this vulnerability allows an attacker to cause a Denial of Service (DoS) on the affected device. This can manifest as a process crash or general device instability [1].
Mitigation
No patched version or specific mitigation details are available in the provided references. The latest version mentioned is V16.01.0.6 [1].
AI Insight generated on Jun 9, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.
References
1News mentions
0No linked articles in our index yet.