How severe is CVE-2021-3969?

CVE-2021-3969 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-3969 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3969?

CVE-2021-3969 affects Lenovo System Interface Foundation. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3969?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-3969 published?

CVE-2021-3969 was published on 2022-05-18 and last updated on 2026-06-17.

CVE-2021-3969

CVE-2021-3969 is a high-severity vulnerability in Lenovo System Interface Foundation with a CVSS 3.x base score of 7.8. 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-367.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.4
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-367
Affected product: Lenovo System Interface Foundation
Published: 2022-05-18
Last modified: 2026-06-17

Description

A Time of Check Time of Use (TOCTOU) vulnerability was reported in IMController, a software component of Lenovo System Interface Foundation, prior to version 1.1.20.3that could allow a local attacker to elevate privileges.

Frequently asked questions

What is CVE-2021-3969?: A Time of Check Time of Use (TOCTOU) vulnerability was reported in IMController, a software component of Lenovo System Interface Foundation, prior to version 1.1.20.3that could allow a local attacker to elevate privileges.
How severe is CVE-2021-3969?: CVE-2021-3969 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-3969 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3969?: CVE-2021-3969 affects Lenovo System Interface Foundation. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3969?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-3969 published?: CVE-2021-3969 was published on 2022-05-18 and last updated on 2026-06-17.

References

https://support.lenovo.com/us/en/product_security/LEN-75210

Affected products (1)

cpe:2.3:a:lenovo:system_interface_foundation:*:*:*:*:*:*:*:*

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