Is CVE-2021-3849 in the CISA KEV catalog?

No. CVE-2021-3849 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3849?

CVE-2021-3849 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-3849?

CVE-2021-3849 has an EPSS score of 1.22% (65th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3849?

Upgrade nextscale fan power controller firmware to 44a-3.70 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3849

CRITICAL

9.8

CVSS v3

NVD

Description

An authentication bypass vulnerability was discovered in the web interface of the Lenovo Fan Power Controller2 (FPC2) and Lenovo System Management Module (SMM) firmware that could allow an unauthenticated attacker to execute commands on the SMM and FPC2. SMM2 is not affected.

CWE-288

How to fix

Remediation Available

nextscale fan power controller firmwareNVD

Affected:< 44a-3.70Fixed in:44a-3.70CVE-2021-3849derived from NVD

nextscale n1200 enclosure firmwareNVD

Affected:< fhet50b-2.90Fixed in:fhet50b-2.90CVE-2021-3849derived from NVD

thinkagile hx enclosure certified node firmwareNVD

Affected:< tesm28b-1.21Fixed in:tesm28b-1.21CVE-2021-3849derived from NVD

thinkagile vx enclosure firmwareNVD

Affected:< tesm28b-1.21Fixed in:tesm28b-1.21CVE-2021-3849derived from NVD

thinksystem d2 enclosure firmwareNVD

Affected:< tesm28b-1.21Fixed in:tesm28b-1.21CVE-2021-3849derived 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

1.22%probability of exploitation in 30 days

65thpercentile

Moderate risk: more likely to be exploited than 65% of all known CVEs.

References

Vendor Advisory1

support.lenovo.com

Related Vulnerabilities

Other CWE-288 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-42793	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2024-1709	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2024-27198	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2025-4427	Medium	5.3	100%	KEV	Fix
CVE-2024-55591	Critical	9.8	98%	KEV + Ransom	Fix
CVE-2023-46747	Critical	9.8	97%	KEV + Ransom	-

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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.