CVE-2021-3786

A potential vulnerability in the SMI callback function used in CSME configuration of some Lenovo Notebook and ThinkPad systems could be used to leak out data out of the SMRAM range.

Published: 2021-11-12 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-3786 is rated Low Risk (22.3/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.23%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-3786

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.04% 0.23% +0.18%
2 2025-12-09 0.11% 0.04% -0.06%
3 2025-11-21 — 0.11% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-3786

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.4 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 0.8 3.6 [email protected]
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.8 3.6 [email protected]
2.1 2.0 LOW
AV:L/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 3.9 2.9 [email protected]

Weakness enumeration for CVE-2021-3786

Affected software / configurations for CVE-2021-3786

Vendor Product Version Raw CPE
lenovo thinkpad_x380_yoga_firmware < 2020-10-31 cpe:2.3:o:lenovo:thinkpad_x380_yoga_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_fold_gen_1_firmware < 2021-10-29 cpe:2.3:o:lenovo:thinkpad_x1_fold_gen_1_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_yoga_260_firmware < 2021-10-25 cpe:2.3:o:lenovo:thinkpad_yoga_260_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_yoga_11e_3rd_gen_firmware < 2021-10-31 cpe:2.3:o:lenovo:thinkpad_yoga_11e_3rd_gen_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_yoga_15_firmware < n19et66w cpe:2.3:o:lenovo:thinkpad_yoga_15_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_yoga_370_firmware < 2021-10-31 cpe:2.3:o:lenovo:thinkpad_yoga_370_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x12_detachable_gen_1_firmware < 2021-10-31 cpe:2.3:o:lenovo:thinkpad_x12_detachable_gen_1_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x390_firmware < n2jet96w cpe:2.3:o:lenovo:thinkpad_x390_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_yoga_11e_4th_gen_firmware < 2021-10-31 cpe:2.3:o:lenovo:thinkpad_yoga_11e_4th_gen_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_yoga_11e_5th_gen_firmware < 2021-10-31 cpe:2.3:o:lenovo:thinkpad_yoga_11e_5th_gen_firmware:*:*:*:*:geminilake-r:*:*:*
lenovo thinkpad_x250_firmware < 2021-10-31 cpe:2.3:o:lenovo:thinkpad_x250_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x260_firmware < 2021-10-31 cpe:2.3:o:lenovo:thinkpad_x260_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x390_yoga_firmware < n2let87w cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x280_firmware < n20et58w cpe:2.3:o:lenovo:thinkpad_x280_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_titanium_firmware < n2met51w cpe:2.3:o:lenovo:thinkpad_x1_titanium_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x270_firmware < 2021-10-29 cpe:2.3:o:lenovo:thinkpad_x270_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_carbon_5th_gen_kabylake_firmware < n1met66w cpe:2.3:o:lenovo:thinkpad_x1_carbon_5th_gen_kabylake_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x13_gen_1_firmware < n2yet31w cpe:2.3:o:lenovo:thinkpad_x13_gen_1_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x13_gen_2_firmware < n35et41w cpe:2.3:o:lenovo:thinkpad_x13_gen_2_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x13_yoga_gen_1_firmware < n2uet56w cpe:2.3:o:lenovo:thinkpad_x13_yoga_gen_1_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x13_yoga_gen_2_firmware < n39et47w cpe:2.3:o:lenovo:thinkpad_x13_yoga_gen_2_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_carbon_5th_gen_skylake_firmware < n1met66w cpe:2.3:o:lenovo:thinkpad_x1_carbon_5th_gen_skylake_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_yoga_1st_gen_firmware < n1fet76w cpe:2.3:o:lenovo:thinkpad_x1_yoga_1st_gen_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_yoga_3rd_gen_firmware < n25et57w cpe:2.3:o:lenovo:thinkpad_x1_yoga_3rd_gen_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_yoga_4th_gen_firmware < n2het64w cpe:2.3:o:lenovo:thinkpad_x1_yoga_4th_gen_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_yoga_gen_5_firmware < n2wet30w cpe:2.3:o:lenovo:thinkpad_x1_yoga_gen_5_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_carbon_4th_gen_firmware < n1fet76w cpe:2.3:o:lenovo:thinkpad_x1_carbon_4th_gen_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_10_firmware < 2021-10-25 cpe:2.3:o:lenovo:thinkpad_10_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_nano_gen_1_firmware < n2tet67w cpe:2.3:o:lenovo:thinkpad_x1_nano_gen_1_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_extreme_firmware < n2eet54w cpe:2.3:o:lenovo:thinkpad_x1_extreme_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_extreme_2nd_firmware < n2oet53w cpe:2.3:o:lenovo:thinkpad_x1_extreme_2nd_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_extreme_gen_3_firmware < n2vet33w cpe:2.3:o:lenovo:thinkpad_x1_extreme_gen_3_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t460s_firmware < n1cet84w cpe:2.3:o:lenovo:thinkpad_t460s_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_s2_gen_6_firmware < 2021-10-31 cpe:2.3:o:lenovo:thinkpad_s2_gen_6_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_carbon_gen_6_firmware < n23et78w cpe:2.3:o:lenovo:thinkpad_x1_carbon_gen_6_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_carbon_gen_7_firmware < n2het64w cpe:2.3:o:lenovo:thinkpad_x1_carbon_gen_7_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_carbon_gen_8_firmware < n2het64w cpe:2.3:o:lenovo:thinkpad_x1_carbon_gen_8_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t560_firmware < n1ket52w cpe:2.3:o:lenovo:thinkpad_t560_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t460p_firmware < 2021-10-29 cpe:2.3:o:lenovo:thinkpad_t460p_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_w550s_firmware < n11et54w cpe:2.3:o:lenovo:thinkpad_w550s_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t590_firmware < n2iet96w cpe:2.3:o:lenovo:thinkpad_t590_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t570_firmware < n1vet57w cpe:2.3:o:lenovo:thinkpad_t570_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_s2_yoga_gen_6_firmware < 2021-10-31 cpe:2.3:o:lenovo:thinkpad_s2_yoga_gen_6_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t480_firmware < n24et65w cpe:2.3:o:lenovo:thinkpad_t480_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_tablet_firmware < n1let92w cpe:2.3:o:lenovo:thinkpad_x1_tablet_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t550_firmware < n11et54w cpe:2.3:o:lenovo:thinkpad_t550_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_carbon_3rd_gen_firmware < n14et56w cpe:2.3:o:lenovo:thinkpad_x1_carbon_3rd_gen_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_tablet_gen_2_firmware < n1oet56w cpe:2.3:o:lenovo:thinkpad_x1_tablet_gen_2_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_x1_tablet_gen_3_firmware < 2021-10-29 cpe:2.3:o:lenovo:thinkpad_x1_tablet_gen_3_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t580_firmware < n27et43w cpe:2.3:o:lenovo:thinkpad_t580_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t480s_firmware < n22et70w cpe:2.3:o:lenovo:thinkpad_t480s_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t15_firmware < n2xet32w cpe:2.3:o:lenovo:thinkpad_t15_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t460_firmware < 2021-10-31 cpe:2.3:o:lenovo:thinkpad_t460_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t470_firmware < n1qet92w cpe:2.3:o:lenovo:thinkpad_t470_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t490_firmware < n2iet96w cpe:2.3:o:lenovo:thinkpad_t490_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t490s_firmware < n2iet96w cpe:2.3:o:lenovo:thinkpad_t490s_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t14s_gen_2_firmware < n35et41w cpe:2.3:o:lenovo:thinkpad_t14s_gen_2_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t14s_firmware < 2021-10-15 cpe:2.3:o:lenovo:thinkpad_t14s_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t470p_firmware < r0fet55w cpe:2.3:o:lenovo:thinkpad_t470p_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t470s_firmware < 2021-10-29 cpe:2.3:o:lenovo:thinkpad_t470s_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_p71_firmware < 2021-10-29 cpe:2.3:o:lenovo:thinkpad_p71_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t440p_firmware < 2021-10-29 cpe:2.3:o:lenovo:thinkpad_t440p_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t15_gen_2_firmware < n34et42w cpe:2.3:o:lenovo:thinkpad_t15_gen_2_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t15p_gen_1_firmware < 2021-10-29 cpe:2.3:o:lenovo:thinkpad_t15p_gen_1_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_p70_firmware < n1detb2w cpe:2.3:o:lenovo:thinkpad_p70_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t15g_gen_1_firmware < 2021-10-29 cpe:2.3:o:lenovo:thinkpad_t15g_gen_1_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t14_gen_1_firmware < n2xet32w cpe:2.3:o:lenovo:thinkpad_t14_gen_1_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_t14_gen_2_firmware < n34et42w cpe:2.3:o:lenovo:thinkpad_t14_gen_2_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_p73_firmware < n2net47w cpe:2.3:o:lenovo:thinkpad_p73_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_s540_firmware < 2021-10-25 cpe:2.3:o:lenovo:thinkpad_s540_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_p72_firmware < n2cet60w cpe:2.3:o:lenovo:thinkpad_p72_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_l380_firmware < 2021-10-31 cpe:2.3:o:lenovo:thinkpad_l380_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_s5_2nd_gen_firmware < 2021-10-31 cpe:2.3:o:lenovo:thinkpad_s5_2nd_gen_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_p15v_gen_1_firmware < 2021-10-29 cpe:2.3:o:lenovo:thinkpad_p15v_gen_1_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_p53_firmware < n2net47w cpe:2.3:o:lenovo:thinkpad_p53_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_p53s_firmware < n2iet96w cpe:2.3:o:lenovo:thinkpad_p53s_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_p43s_firmware < n2iet96w cpe:2.3:o:lenovo:thinkpad_p43s_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_p51_firmware < n1uet82w cpe:2.3:o:lenovo:thinkpad_p51_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_p51s_firmware < n1vet57w cpe:2.3:o:lenovo:thinkpad_p51s_firmware:*:*:*:*:*:*:*:*
lenovo thinkpad_p50_firmware < n1eet92w cpe:2.3:o:lenovo:thinkpad_p50_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-3786

cvelogic Threat Intelligence