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CVE-2021-43936 is an unrestricted file upload vulnerability in the WebHMI portal. The application fails to properly validate or restrict the types of files that can be uploaded or transferred, allowing attackers to upload files of dangerous types. These files may be automatically processed by the product's environment, potentially leading to arbitrary code execution.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a Python exploit script (cve-2021-43936.py) targeting CVE-2021-43936, a critical authenticated remote code execution vulnerability in WebHMI Firmware versions prior to 4.1 (tested on 4.0.7475). The exploit works by authenticating to the device (using default credentials 'admin:admin'), uploading a PHP webshell via an unrestricted file upload endpoint, and then using the webshell to execute a reverse shell command. The reverse shell connects back to the attacker's machine, providing remote code execution. The script requires the attacker to specify the target IP and port, as well as their own IP and port for the reverse shell listener. The repository includes a README with usage instructions and a LICENSE file. The main exploit logic is contained in a single Python file, which automates the entire attack chain from login to shell access. The exploit is operational and provides a working payload, but is not part of a larger exploitation framework.
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1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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