Tenda AC10
CVE-2026-51380
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated, low-complexity request to a network-reachable CGI endpoint; A:H is certain for permanent DoS and C:H/I:H reflect the credible RCE potential from a control-flow overflow.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Buffer Overflow vulnerability in Tenda AC10 v3 (firmware V03.03.16.09) allows attackers to cause a permanent Denial of Service (DoS) or potentially execute remote code via the /cgi-bin/UploadCfg endpoint
AnalysisAI
Remote code execution or permanent denial of service in the Tenda AC10 v3 SOHO router (firmware V03.03.16.09) stems from a classic buffer overflow reachable through the /cgi-bin/UploadCfg web endpoint. Attackers who can reach the router's management interface can send oversized crafted input to crash the device permanently or potentially run arbitrary code on it. Proof-of-concept material appears to be published on GitHub, though this is not listed in CISA KEV and carries a low EPSS score of 0.17% (7th percentile), indicating no confirmed widespread exploitation yet.
Technical ContextAI
The Tenda AC10 is an AC1200 dual-band consumer/SOHO Wi-Fi router. The flaw is a CWE-120 Classic Buffer Overflow, meaning the firmware copies attacker-controlled input into a fixed-size stack or heap buffer without validating its length, corrupting adjacent memory. The vulnerable code path is the CGI handler behind /cgi-bin/UploadCfg, which processes configuration-upload requests to the router's embedded httpd web server. On memory-constrained MIPS/ARM embedded devices like this, such overflows readily crash the httpd/router process (DoS) and, if the overwritten memory includes control data such as a return address, can be leveraged for arbitrary code execution. CPE data in the feed is a placeholder (cpe:2.3:a:n/a:n/a:*) and does not properly identify the product, so the description and vendor material are the authoritative source for affected identification.
RemediationAI
No vendor-released patched firmware version is identified in the provided data, so no fixed version can be cited; monitor the Tenda support page at https://www.tendacn.com/material/show/104968 for an updated firmware release and apply it once available. As compensating controls, disable remote/WAN management on the router so the web interface and the /cgi-bin/UploadCfg endpoint are only reachable from the trusted LAN (trade-off: administrators lose remote administration convenience). Restrict access to the router's HTTP/HTTPS management ports to a limited set of trusted management hosts via firewall/ACL where the platform allows, and change default credentials to reduce lateral access. If the model reaches end-of-support without a fix, plan replacement with a supported device, since embedded routers rarely receive backported security fixes.
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Same weakness CWE-120 – Classic Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today