PatchTheCVECVE-2021-43936: The software allows the attacker to upload or transfer files of dangerous types to the WebHMI portal, that may
CVE-2021-43936 is a critical-severity flaw (CVSS 10.0) affecting webhmi firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- EPSS top 2%: very likely to be exploited
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 10.0 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 35.8% (top 2%) |
| CISA exploited list | No |
| Weakness | CWE-434 |
| Published | 2021-12-06 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-43936?
webhmi firmware: upgrade to 4.1. Exact commands for each OS are on this page.
Is CVE-2021-43936 being exploited?
CVE-2021-43936 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-43936 affect?
CVE-2021-43936 affects webhmi firmware. Severity is critical (CVSS 10.0). 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.
How urgent is CVE-2021-43936?
Priority 70/100. Critical severity; EPSS top 2%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action
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