How severe is CVE-2021-3843?

CVE-2021-3843 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-2021-3843 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3843?

CVE-2021-3843 primarily affects Lenovo Thinkpad 11e 3rd Gen Firmware. In total, 32 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-3843?

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

When was CVE-2021-3843 published?

CVE-2021-3843 was published on 2021-11-12 and last updated on 2026-06-17.

CVE-2021-3843

CVE-2021-3843 is a medium-severity vulnerability in Lenovo Thinkpad 11e 3rd Gen 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% (19th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Lenovo Thinkpad 11e 3rd Gen Firmware
Published: 2021-11-12
Last modified: 2026-06-17

Description

A potential vulnerability in the SMI function to access EEPROM in some ThinkPad models may allow an attacker with local access and elevated privileges to execute arbitrary code.

Frequently asked questions

What is CVE-2021-3843?: A potential vulnerability in the SMI function to access EEPROM in some ThinkPad models may allow an attacker with local access and elevated privileges to execute arbitrary code.
How severe is CVE-2021-3843?: CVE-2021-3843 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-2021-3843 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3843?: CVE-2021-3843 primarily affects Lenovo Thinkpad 11e 3rd Gen Firmware. In total, 32 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-3843?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-3843 published?: CVE-2021-3843 was published on 2021-11-12 and last updated on 2026-06-17.

References

https://support.lenovo.com/us/en/product_security/LEN-72619

Affected products (32)

cpe:2.3:o:lenovo:thinkpad_11e_3rd_gen_firmware:*:*:*:*:braswell:*:*:*
cpe:2.3:o:lenovo:thinkpad_11e_3rd_gen_firmware:*:*:*:*:skylate:*:*:*
cpe:2.3:o:lenovo:thinkpad_11e_4th_gen_i3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_11e_4th_gen_i7_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_11e_4th_gen_i5_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_11e_4th_gen_celeron_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_11e_yoga_gen_6_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_13_gen_2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_l13_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_l13_gen_2_firmware:*:*:*:*:non-vpro:*:*:*
cpe:2.3:o:lenovo:thinkpad_l13_gen_2_firmware:*:*:*:*:vpro:*:*:*
cpe:2.3:o:lenovo:thinkpad_l13_yoga_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_l13_yoga_gen_2_firmware:*:*:*:*:non-vpro:*:*:*
cpe:2.3:o:lenovo:thinkpad_l13_yoga_gen_2_firmware:*:*:*:*:vpro:*:*:*
cpe:2.3:o:lenovo:thinkpad_l14_gen_1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_l14_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_l15_gen_1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_l15_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_l380_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_l380_yoga_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_l390_yoga_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_l390_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_s5_2nd_gen_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_t460_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_s2_gen_6_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_s2_yoga_gen_6_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x12_detachable_gen_1_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x260_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x380_yoga_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_11e_5th_gen_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lenovo:thinkpad_x1_fold_gen_1_firmware:*:*:*:*:*:*:*:*

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