CVE intelligence and bounded remediation

CVE-2021-3519 — Lenovo Ideacentre C5-14Mb05 Firmware security vulnerability

Medium CVSS 6.9

A vulnerability was reported in some Lenovo Desktop models that could allow unauthorized access to the boot menu, when the "BIOS Password At Boot Device List" BIOS setting is Yes.

Severity
Medium
CVSS
6.9 (2.0)
Published
2021-11-12
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-287

Affected products

  • lenovo / ideacentre_c5-14mb05_firmware
  • lenovo / ideacentre_3-07imb05_firmware
  • lenovo / ideacentre_5-14imb05_firmware
  • lenovo / ideacentre_5-14iob6_firmware
  • lenovo / ideacentre_creator_5-14iob6_firmware
  • lenovo / ideacentre_g5-14imb05_firmware

Showing 6 representative product identities from 62 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

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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