Is CVE-2021-22743 in the CISA KEV catalog?

No. CVE-2021-22743 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-22743?

CVE-2021-22743 has a CVSS v3 base score of 3.9 (LOW).

What is the EPSS score for CVE-2021-22743?

CVE-2021-22743 has an EPSS score of 0.22% (13th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22743?

Upgrade tcm 4351b firmware to 11.5.1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-22743

LOW

3.9

CVSS v3

NVD

Description

Improper Check for Unusual or Exceptional Conditions vulnerability exists in Triconex TCM 4351B installed on Tricon V11.3.x systems that could cause module reset when TCM receives malformed TriStation packets while the write-protect keyswitch is in the program position.

CWE-754

How to fix

Remediation Available

tcm 4351b firmwareNVD

Affected:>= 11.3.0, < 11.5.1Fixed in:11.5.1CVE-2021-22743derived from NVD

triconex model 3009 mp firmwareNVD

Affected:>= 11.3.0, < 11.8.0Fixed in:11.8.0CVE-2021-22743derived 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 VectorPhysical

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.22%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Vendor Advisory1

download.schneider-electric.com

Related Vulnerabilities

Other CWE-754 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-4367	High	8.8	73%	-	Fix
CVE-2022-39288	High	7.5	59%	-	Fix
CVE-2023-30591	High	7.5	54%	-	-
CVE-2023-41993	High	8.8	29%	KEV	Fix
CVE-2024-43044	High	8.8	29%	-	Fix
CVE-2024-3393	High	7.5	27%	KEV	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.