Is CVE-2021-43931 in the CISA KEV catalog?

No. CVE-2021-43931 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-43931?

CVE-2021-43931 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-43931?

CVE-2021-43931 has an EPSS score of 1.39% (69th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-43931?

Upgrade webhmi firmware to 4.1 or later.

CVE & CISA-KEV Catalog

CVE-2021-43931

CRITICAL

9.8

CVSS v3

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.

CWE-287Improper Authentication

How to fix

Remediation Available

webhmi firmwareNVD

Affected:< 4.1Fixed in:4.1CVE-2021-43931derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.39%probability of exploitation in 30 days

69thpercentile

Moderate risk: more likely to be exploited than 69% of all known CVEs.

References

Patch1

us-cert.cisa.gov

Related Vulnerabilities

Other CWE-287 (Improper Authentication) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-35082	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-35078	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2017-7921	Critical	9.8	100%	KEV	-
CVE-2024-7593	Critical	9.8	100%	KEV	-
CVE-2023-46805	High	8.2	100%	KEV + Ransom	-
CVE-2022-40684	Critical	9.8	100%	KEV + Ransom	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.