CVE-2021-3843 json
A potential vulnerability in the SMI function to access EEPROM in some ThinkPad models may allow an attacker with local access and elevated…
published 2021-11-12 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-27086
- cvss
- 6.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 20%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- lenovo thinkpad_l14_gen_1_firmware 1.15
- lenovo thinkpad_l14_firmware 1.20.1.17
- lenovo thinkpad_l15_gen_1_firmware 1.15
- lenovo thinkpad_l15_firmware 1.20.1.17
- lenovo thinkpad_x12_detachable_gen_1_firmware 1.16
- lenovo thinkpad_x390_yoga_firmware n2let87w
- lenovo thinkpad_x1_fold_gen_1_firmware n2pet50w
Exploit prediction
0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.7 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 6.7 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.2 | AV:L/AC:L/Au:N/C:C/I:C/A:C |
Affected products
- Lenovo ThinkPad BIOS
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
support.lenovo.com
/us/en/product_security/LEN-72619
vendor-advisory
Sources
- CVE List CVE-2021-3843
- NVD CVE-2021-3843
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