Is CVE-2021-3843 in the CISA KEV catalog?

No. CVE-2021-3843 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3843?

CVE-2021-3843 has a CVSS v3 base score of 6.7 (MEDIUM).

What is the EPSS score for CVE-2021-3843?

CVE-2021-3843 has an EPSS score of 0.27% (19th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3843?

Upgrade thinkpad l14 firmware to 1.20.1.17 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3843

MEDIUM

6.7

CVSS v3

NVD

Description

A potential vulnerability in the SMI function to access EEPROM in some ThinkPad models may allow an attacker with local access and elevated privileges to execute arbitrary code.

CWE-20Improper Input Validation

How to fix

Remediation Available

thinkpad l14 firmwareNVD

Affected:< 1.20.1.17Fixed in:1.20.1.17CVE-2021-3843derived from NVD

thinkpad l14 gen 1 firmwareNVD

Affected:< 1.15Fixed in:1.15CVE-2021-3843derived from NVD

thinkpad l15 firmwareNVD

Affected:< 1.20.1.17Fixed in:1.20.1.17CVE-2021-3843derived from NVD

thinkpad l15 gen 1 firmwareNVD

Affected:< 1.15Fixed in:1.15CVE-2021-3843derived from NVD

thinkpad x12 detachable gen 1 firmwareNVD

Affected:< 1.16Fixed in:1.16CVE-2021-3843derived from NVD

thinkpad x1 fold gen 1 firmwareNVD

Affected:< n2pet50wFixed in:n2pet50wCVE-2021-3843derived from NVD

thinkpad x390 yoga firmwareNVD

Affected:< n2let87wFixed in:n2let87wCVE-2021-3843derived 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 VectorLocal

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.27%probability of exploitation in 30 days

19thpercentile

Low risk: more likely to be exploited than 19% of all known CVEs.

References

Vendor Advisory1

support.lenovo.com

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	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.