EUVD-2026-36756
GHSA-mhfm-9jg9-ph7h
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unsanitized ims_apn reaches a shell with no auth or interaction, giving root command execution, so AV:N/AC:L/PR:N/UI:N and full C/I/A; scope unchanged within 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_ims_on_with_apn via the ims_apn parameter.
AnalysisAI
OS command injection in the Tenda 5G03 5G CPE router (firmware V05.03.02.04, hardware version 1.0) allows remote attackers to execute arbitrary shell commands by injecting metacharacters into the ims_apn parameter processed by the action_ims_on_with_apn function. Because the injected commands run with the router's elevated (typically root) web-server privileges, an attacker gains full control of the device. Publicly available exploit/proof-of-concept material exists in a third-party IoT vulnerability repository, though there is no public exploit identified as weaponized and the issue is not on the CISA KEV list; EPSS is low at 0.52%.
Technical ContextAI
The affected device is a Tenda 5G03 4G/5G CPE (customer premises equipment) router that exposes a web management interface backed by CGI-style action handlers. The vulnerable handler, action_ims_on_with_apn, is responsible for enabling IMS (IP Multimedia Subsystem, used for VoLTE/voice services) with a caller-supplied APN (Access Point Name) value. The root cause is CWE-78 (Improper Neutralization of Special Elements used in an OS Command): the ims_apn parameter is passed into a shell command (commonly via system()/popen() in the C-based httpd found on these SoC-based routers) without sanitization, so shell metacharacters such as ; | ` $() break out of the intended command context. The CPE data is unhelpfully populated as 'cpe:2.3:a:n/a:n/a:*' (vendor/product literally 'n/a'), so the exact affected component must be taken from the description rather than the structured CPE.
RemediationAI
No vendor-released patch or fixed firmware version has been identified from the available data, so remediation relies on compensating controls. Restrict access to the router's web management interface: ensure remote/WAN-side management is disabled so the interface is reachable only from trusted LAN hosts, and place the device behind a firewall that blocks inbound access to its HTTP(S) management port from the Internet - the trade-off is loss of remote administration convenience. Where feasible, segment the CPE onto a management VLAN and limit which internal hosts can reach the web UI, and change default administrative credentials to reduce the chance an attacker who is already on-network can reach the handler. Monitor the Tenda support site for updated 5G03 firmware superseding V05.03.02.04 and apply it once released. Consult the NVD entry (https://nvd.nist.gov/vuln/detail/CVE-2026-38065) for updates; note the PoC repository (https://github.com/sezangel/IOT-vul) documents the exact request and should be used to validate that any mitigation blocks the vulnerable action_ims_on_with_apn endpoint.
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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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