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Fencer Vulns
critical 10.0

CVE-2021-43936 in the critical feed json

Distributed Data Systems WebHM

published 2021-12-06 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-30798

cvss
10.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
35.8%
EPSS 35.8% chance of exploitation in 30 days, percentile 98%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

  • webhmi webhmi_firmware 4.1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-336-03 updated cvss 10.0

Distributed Data Systems WebHMI

  • Distributed Data Systems WebHMI < 4.1
    affected: mitigation “Upgrading the platform software to the latest release, Version 4.1”

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Timeline

  1. Published
  2. First public exploit (EDB-50589)

Exploit prediction

35.80% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-50589 WebHMI 4.0 - Remote Code Execution (RCE) (Authenticated) webapps, 2021-12-13
  • packetstormsecurity.com http://packetstormsecurity.com/files/165252/WebHMI-4.0-Remote-Code-Execution.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • Distributed Data Systems WebHMI

Classification

Weakness
  • CWE-434 Unrestricted Upload of File with Dangerous Type

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.