How severe is CVE-2021-3599?

CVE-2021-3599 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-2021-3599 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3599?

CVE-2021-3599 primarily affects Lenovo Thinkpad X380 Yoga Firmware. In total, 133 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-3599?

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

When was CVE-2021-3599 published?

CVE-2021-3599 was published on 2021-11-12 and last updated on 2026-06-17.

CVE-2021-3599

CVE-2021-3599 is a medium-severity vulnerability in Lenovo Thinkpad X380 Yoga 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% (20th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Lenovo Thinkpad X380 Yoga Firmware
Published: 2021-11-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-3599?: 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.
How severe is CVE-2021-3599?: CVE-2021-3599 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-2021-3599 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3599?: CVE-2021-3599 primarily affects Lenovo Thinkpad X380 Yoga Firmware. In total, 133 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-3599?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-3599 published?: CVE-2021-3599 was published on 2021-11-12 and last updated on 2026-06-17.

References

https://support.lenovo.com/us/en/product_security/LEN-67440

Affected products (133)

cpe:2.3:o:lenovo:thinkpad_x380_yoga_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_fold_gen_1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_yoga_260_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_yoga_11e_3rd_gen_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_yoga_15_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_yoga_370_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x12_detachable_gen_1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x390_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_yoga_11e_4th_gen_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_yoga_11e_5th_gen_firmware:*:*:*:*:geminilake-r:*:*:*
cpe:2.3:o:lenovo:thinkpad_x250_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x260_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x280_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_titanium_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x270_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_carbon_5th_gen_kabylake_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x13_gen_1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x13_gen_2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x13_yoga_gen_1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x13_yoga_gen_2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_carbon_5th_gen_skylake_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_yoga_1st_gen_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_yoga_3rd_gen_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_yoga_4th_gen_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_yoga_gen_5_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_carbon_4th_gen_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_10_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_nano_gen_1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_extreme_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_extreme_2nd_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_extreme_gen_3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_t460s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_s2_gen_6_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_carbon_gen_6_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_carbon_gen_7_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_carbon_gen_8_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_t560_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_t460p_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_w550s_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Lenovo Thinkpad X380 Yoga Firmware

CVE-2019-6188 — Critical (CVSS 9.8): The BIOS tamper detection mechanism was not triggered in Lenovo ThinkPad T460p, BIOS versions up to R07ET90W, and…
CVE-2019-18619 — High (CVSS 7.8): Incorrect parameter validation in the synaTee component of Synaptics WBF drivers using an SGX enclave (all versions…
CVE-2018-9062 — Medium (CVSS 6.8): In some Lenovo ThinkPad products, one BIOS region is not properly included in the checks, allowing injection of…
CVE-2021-3843 — Medium (CVSS 6.7): A potential vulnerability in the SMI function to access EEPROM in some ThinkPad models may allow an attacker with local…
CVE-2019-10724 — Medium (CVSS 6.5): There is a vulnerability with the Dolby DAX2 API system services in which a low-privileged user can terminate arbitrary…
CVE-2020-8323 — Medium (CVSS 6.4): A potential vulnerability in the SMI callback function used in the Legacy SD driver in some Lenovo ThinkPad,…

All CVEs affecting Lenovo Thinkpad X380 Yoga 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 →