MEDIUM
CVE-2021-3599
CWE-20Published: November 12, 2021· Updated: Jun 17, 2026
6.7
CVSS v3.1
Official Description
A potential vulnerability in the SMI callback function used to access flash device in some ThinkPad models may allow an attacker with local access and elevated privileges to execute arbitrary code.
Technical Analysis
CVE-2021-3599 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
Lenovo266 product(s)
thinkpad x380 yoga firmwarethinkpad x380 yogathinkpad x1 fold gen 1 firmwarethinkpad x1 fold gen 1thinkpad yoga 260 firmwarethinkpad yoga 260thinkpad yoga 11e 3rd gen firmwarethinkpad yoga 11e 3rd genthinkpad yoga 15 firmwarethinkpad yoga 15thinkpad yoga 370 firmwarethinkpad yoga 370+254
Source: NVD CPE · 266 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (2)
→
https://support.lenovo.com/us/en/product_security/LEN-67440Patch · Vendor Advisory
→
https://support.lenovo.com/us/en/product_security/LEN-67440Patch · Vendor Advisory
Quick Facts
CVE IDCVE-2021-3599
CVSS Score6.7 / 10
SeverityMEDIUM
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedNov 12, 2021
Related CVEs (CWE-20)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-3599 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.