EUVD-2026-36751
GHSA-m9g5-85vv-3crg
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Remote unauthenticated command injection into a web handler with no user interaction yields AV:N/AC:L/PR:N/UI:N and full C/I/A as root on the device.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
3DescriptionCVE.org
Tenda 5G03 V05.03.02.04 (Version 1.0) is vulnerable to Command injection in the function action_unlock_sim via the pin parameter.
AnalysisAI
Command injection in the Tenda 5G03 5G CPE router (firmware V05.03.02.04) lets remote unauthenticated attackers inject arbitrary OS commands through the pin parameter handled by the action_unlock_sim function. The flaw carries a critical 9.8 CVSS and gives total control over the device, and a public write-up/exploit exists in a third-party IoT vulnerability repository, though it is not listed in CISA KEV. EPSS is modest at 0.45% (36th percentile), indicating no observed mass exploitation yet.
Technical ContextAI
The Tenda 5G03 is a consumer/SOHO 5G mobile broadband router (CPE) whose web management firmware exposes SIM-management actions. The vulnerable action_unlock_sim handler passes the attacker-supplied pin value into an underlying OS/shell command without sanitization, matching CWE-78 (Improper Neutralization of Special Elements used in an OS Command). Such embedded-router handlers typically build strings passed to system()/popen() or busybox shell utilities, so shell metacharacters (;, |, `, $()) in the pin field break out of the intended command and execute arbitrary commands, usually as root given these devices run management daemons with high privilege.
RemediationAI
No vendor-released patch identified at time of analysis - Tenda has not published a fixed firmware version in the provided data, so upgrade guidance cannot cite an exact release. As compensating controls, remove the device's web management interface from any WAN/Internet-facing exposure and restrict administration to a trusted management VLAN or specific LAN hosts (trade-off: remote management convenience is lost); place the router behind a firewall that blocks inbound access to its HTTP management port, and disable remote/cloud management features if enabled. Where feasible, restrict access to the SIM-unlock/management endpoint to authenticated administrative sessions only, and monitor the device for anomalous outbound connections indicative of a shell payload. Track the NVD record (https://nvd.nist.gov/vuln/detail/CVE-2026-38060) and Tenda's support site for a firmware update superseding V05.03.02.04, and apply it once released.
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Same weakness CWE-78 – OS Command Injection
View allSame technique Command Injection
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External POC / Exploit Code
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