CVE-2021-4212

CVE-2021-4212 is a medium-severity vulnerability in Lenovo C340-14iml Firmware with a CVSS 3.x base score of 6.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

• Severity: Medium (CVSS 3.x base score 6.7)
• CVSS v2: 7.2
• EPSS exploit prediction: 0% (16th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-20
• Affected product: Lenovo C340-14iml Firmware
• Published: 2022-04-22
• Last modified: 2026-06-17

Description

A potential vulnerability in the SMI callback function used in the Legacy BIOS mode driver in some Lenovo Notebook models may allow an attacker with local access and elevated privileges to execute arbitrary code.

Frequently asked questions

What is CVE-2021-4212?

A potential vulnerability in the SMI callback function used in the Legacy BIOS mode driver in some Lenovo Notebook models may allow an attacker with local access and elevated privileges to execute arbitrary code.

How severe is CVE-2021-4212?

CVE-2021-4212 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-4212 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-4212?

CVE-2021-4212 primarily affects Lenovo C340-14iml Firmware. In total, 62 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-4212?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-4212 published?

CVE-2021-4212 was published on 2022-04-22 and last updated on 2026-06-17.

References

• https://support.lenovo.com/us/en/product_security/LEN-77639

Affected products (62)

• cpe:2.3:o:lenovo:c340-14iml_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:c340-15iml_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:d330-10igm_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:duet_3-10igl5_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:e41-50_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:flex-14iml_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:flex-15iml_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:ideapad_3-14are05_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:ideapad_3-15are05_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:ideapad_3-17are05_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:ideapad_5-14alc05_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:ideapad_5-14are05_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:ideapad_5-15itl05_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:ideapad_5_pro-14acn6_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:ideapad_5_pro-14itl6_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:ideapad_5_pro-16ihu6_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:ideapad_creator_5-15imh05_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:ideapad_gaming_3-15ach6_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:ideapad_gaming_3-15arh05_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:ideapad_gaming_3-15imh05_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:l340-15irh_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:l340-15iwl_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:l340-15iwl_touch_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:l340-17irh_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:l340-17iwl_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:legion_y540-15irh_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:legion_y540-15irh-pg0_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:legion_y540-17irh_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:legion_y540-17irh-pg0_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:legion_y545_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:legion_y545-pg0_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:legion_y7000-2019_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:legion_y7000-2019-pg0_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:s340-13iml_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:s340-14api_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:s340-14iml_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:s340-15api_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:s340-15api_touch_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:s340-15iml_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:lenovo:s540-14iml_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Lenovo C340-14iml Firmware

• CVE-2020-8321 — Medium (CVSS 6.4): A potential vulnerability in the SMI callback function used in the System Lock Preinstallation driver in some Lenovo…

All CVEs affecting Lenovo C340-14iml Firmware →

Other CWE-20 (Improper Input Validation) vulnerabilities

• CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
• CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
• CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
• CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
• CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
• CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →