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Vulnerability record · CVE-2021-43936 · published 6 December 2021

CVE-2021-43936: Webhmi firmware unrestricted file upload vulnerability

Webhmi · Webhmi Firmware

The software allows the attacker to upload or transfer files of dangerous types to the WebHMI portal, that may be automatically processed within the product's environment or lead to arbitrary code execution.

9.8 CVSS 3.1 Critical EPSS 36% · top 1.6% CWE-434 · Unrestricted file upload
9.8CVSS 3.1 base score, v2 10.0
36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The software allows the attacker to upload or transfer files of dangerous types to the WebHMI portal, that may be automatically processed within the product's environment or lead to arbitrary code execution.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/165252/WebHMI-4.0-Remote-Code-Execution.html ExploitThird Party AdvisoryVDB Entry
https://us-cert.cisa.gov/ics/advisories/icsa-21-336-03 PatchThird Party AdvisoryUS Government Resource
http://packetstormsecurity.com/files/165252/WebHMI-4.0-Remote-Code-Execution.html ExploitThird Party AdvisoryVDB Entry
https://us-cert.cisa.gov/ics/advisories/icsa-21-336-03 PatchThird Party AdvisoryUS Government Resource

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-43931Webhmi firmware improper authentication vulnerabilityThe authentication algorithm of the WebHMI portal is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that i…EPSS 1.4%9.1CVE-2022-2253Webhmi firmware os command injection vulnerabilityA user with administrative privileges in Distributed Data Systems WebHMI 4.1.1.7662 may send OS commands to execute on the host server.EPSS 1.2%4.8CVE-2022-2254Webhmi firmware cross-site scripting vulnerabilityA user with administrative privileges in Distributed Data Systems WebHMI 4.1.1.7662 can store a script that could impact other logged in users.EPSS 0.50%10.0CVE-2026-56291Balbooa Forms Joomla extension unauthenticated arbitrary file upload RCEThe Balbooa Forms extension for Joomla before version 2.4.1 accepts file uploads without authentication and does not restrict file type, allowing exe…KEVEPSS 15%analysed10.0CVE-2026-48939iCagenda Joomla extension unrestricted file upload leads to PHP RCEThe iCagenda extension for Joomla fails to restrict file types in its file attachment feature, allowing arbitrary file uploads that result in PHP cod…KEVEPSS 20%analysed10.0CVE-2026-56290Joomla Page Builder CK unauthenticated file upload leads to RCEThe Joomla Page Builder CK extension before 3.6.0 allows unauthenticated arbitrary file uploads, letting an attacker place executable files on the se…KEVEPSS 31%analysed10.0CVE-2026-48908SP Page Builder for Joomla unauthenticated arbitrary file upload RCESP Page Builder for Joomla permits unauthenticated users to upload arbitrary files, which can lead to upload and execution of PHP code. The flaw is a…KEVEPSS 89%analysed9.8CVE-2024-7399Samsung MagicINFO 9 Server path traversal allows arbitrary file writeSamsung MagicINFO 9 Server before version 21.1050 contains a path traversal flaw (CWE-22) that also enables unrestricted file upload (CWE-434), letti…KEVEPSS 92%analysed

Source: NIST National Vulnerability Database (record CVE-2021-43936), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.