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Vulnerability record · CVE-2021-43931 · published 6 December 2021

CVE-2021-43931: Webhmi firmware improper authentication vulnerability

Webhmi · Webhmi Firmware

The authentication algorithm of the WebHMI portal is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.

9.8 CVSS 3.1 Critical EPSS 1.4% · top 28.7% CWE-287 · Improper authentication
9.8CVSS 3.1 base score, v2 7.5
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

The authentication algorithm of the WebHMI portal is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.

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
https://us-cert.cisa.gov/ics/advisories/icsa-21-336-03 PatchThird Party AdvisoryUS Government Resource
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-2021-43936Webhmi firmware unrestricted file upload vulnerabilityThe software allows the attacker to upload or transfer files of dangerous types to the WebHMI portal, that may be automatically processed within the …EPSS 36%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%7.5CVE-2026-42018JFrog Artifactory improper authentication leaks anonymous tokenJFrog Artifactory can return an internal anonymous-user token to an unauthenticated caller even when anonymous access is disabled. Because the token …KEVEPSS 9.8%analysed9.8CVE-2026-82329JFrog Artifactory improper authentication allows admin takeoverJFrog Artifactory contains an improper authentication weakness (CWE-287) that, under default configuration, may let an unauthenticated attacker with …KEVEPSS 14%analysed8.8CVE-2026-59822LiteLLM MCP endpoint auth bypass via OAuth2 passthrough fallbackLiteLLM's MCP Streamable HTTP endpoint, prior to 1.84.0, let an unauthenticated attacker send a fabricated Authorization header that triggered an OAu…KEVEPSS 0.84%analysed10.0CVE-2026-49869Kestra OSS auth bypass via path suffix match enables RCEKestra OSS AuthenticationFilter whitelists the public config endpoint using request.getPath().endsWith("/configs"), a suffix match instead of an exac…KEVEPSS 2.1%analysed9.8CVE-2023-49105ownCloud Server WebDAV authentication bypass via pre-signed URLsownCloud core before 10.13.1 accepts pre-signed URLs even when the file owner has no signing-key configured, so the signature check is effectively sk…KEVEPSS 43%analysed

Source: NIST National Vulnerability Database (record CVE-2021-43931), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.