No exploitation reportedFix available

CVE-2021-3897

Q: Is CVE-2021-3897 actively exploited?

Active exploitation of CVE-2021-3897 has not been confirmed. Its EPSS score was 1.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-3897?

CVE-2021-3897 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2022-04-22
Fixed in44a-3.70
WeaknessCWE-288

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC

2022-04-2221:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-3897?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-3897?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Ibm nextscale fan power controller firmwareversion to verify

Branch	Affected	Fixed in	Source
44.x	< 44a-3.70	44a-3.70	NVD

Lenovo nextscale n1200 enclosure firmwareversion to verify

Branch	Affected	Fixed in	Source
—	< fhet50b-2.90	fhet50b-2.90	NVD

Lenovo thinkagile hx enclosure certified node firmwareversion to verify

Branch	Affected	Fixed in	Source
—	< tesm28b-1.21	tesm28b-1.21	NVD

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Ibm nextscale fan power controller firmware to 44a-3.70

Advisories and patches

support.lenovo.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.19.8read 2026-10-23
NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
CNAweakness (CWE)CWE-288read 2026-10-23
FIRST EPSSEPSS score1.3 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2022-04-22
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-3897?

Is CVE-2021-3897 actively exploited?

Active exploitation of CVE-2021-3897 has not been confirmed. Its EPSS score was 1.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-3897?

CVE-2021-3897 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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