MEDIUM
CVE-2021-4212
CWE-20Published: April 22, 2022· Updated: Jun 17, 2026
6.7
CVSS v3.1
Official 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.
Technical Analysis
CVE-2021-4212 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 6.7.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.High
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Affected Vendors & Products
Lenovo124 product(s)
c340-14iml firmwarec340-14imlc340-15iml firmwarec340-15imld330-10igm firmwared330-10igmduet 3-10igl5 firmwareduet 3-10igl5e41-50 firmwaree41-50flex-14iml firmwareflex-14iml+112
Source: NVD CPE · 124 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
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GitHub PoC Search
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Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories
All References (2)
→
https://support.lenovo.com/us/en/product_security/LEN-77639Patch · Vendor Advisory
→
https://support.lenovo.com/us/en/product_security/LEN-77639Patch · Vendor Advisory
Quick Facts
CVE IDCVE-2021-4212
CVSS Score6.7 / 10
SeverityMEDIUM
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedApr 22, 2022
Related CVEs (CWE-20)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-4212 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.