CVE intelligence and bounded remediation

CVE-2021-3849 — Lenovo Nextscale N1200 Enclosure Firmware security vulnerability

Critical CVSS 9.8

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.

Severity
Critical
CVSS
9.8 (3.1)
Published
2022-04-22
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-288

Affected products

  • lenovo / nextscale_n1200_enclosure_firmware
  • lenovo / thinkagile_hx_enclosure_certified_node_firmware
  • lenovo / thinkagile_vx_enclosure_firmware
  • lenovo / thinksystem_d2_enclosure_firmware
  • ibm / nextscale_fan_power_controller_firmware

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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