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Fencer Intel
critical 9.8

CVE-2021-3897 json

An authentication bypass vulnerability was discovered in an internal service of the Lenovo Fan Power Controller2 (FPC2) and Lenovo System M…

published 4y ago modified 4mo ago also EUVD-2021-27129

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

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.

Patch / fix

  • lenovo nextscale_n1200_enclosure_firmware fhet50b-2.90
  • lenovo thinkagile_hx_enclosure_certified_node_firmware tesm28b-1.21
  • lenovo thinkagile_vx_enclosure_firmware tesm28b-1.21
  • lenovo thinksystem_d2_enclosure_firmware tesm28b-1.21
  • ibm nextscale_fan_power_controller_firmware 44a-3.70

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Exploit prediction

1.30% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Lenovo Fan Power Controller2 (FPC2)
  • Lenovo Lenovo System Management Module (SMM)

Classification

Weakness
  • CWE-288 Authentication Bypass Using an Alternate Path or Channel

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.