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01 Record

CVE-2021-3849

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

CriticalPUBLISHEDCNA: lenovo
CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

02 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

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
1.30% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 69.9% of scored records. A rank, not a probability.
NVD base score
9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2022-04-22 21:10Z4 YR AGO
Last updated
2024-08-03 17:09Z2 YR AGO
Reserved
2021-10-01
Assigning CNA
lenovo
Record state
PUBLISHED
Severity
Critical (CVSS 9.8)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-288Authentication Bypass Using an Alternate Path or ChannelBase
Data version
5.1
Document digest
562e61c19cad3a49a0f9ca3d7fddec720c93eadd06d49480d37c09f465d88516

05 Affected products

VendorProductVersionsPlatforms

06 References

07 Remediation

Upgrade to the firmware version (or newer) indicated for your model in the Product Impact section in LEN-72615.