What is CVE-2021-3721?

CVE-2021-3721 is a medium-severity vulnerability in Lenovo Pcmanager, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2022-04-22.

How severe is CVE-2021-3721?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Lenovo Pcmanager

CVE-2021-3721

A denial of service vulnerability was reported in Lenovo PCManager prior to version 4.0.20.10282 that could allow an attacker with local access to trigger a blue screen error.

Vulnerability class: Buffer Overflow

Published 2022-04-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (8.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Lenovo Pcmanager — versions unspecified

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

iknow.lenovo.com.cn/detail/dc_200016.html (Vendor Advisory)

Frequently asked questions

What is CVE-2021-3721?: CVE-2021-3721 is a medium-severity vulnerability in Lenovo Pcmanager, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2022-04-22.
How severe is CVE-2021-3721?: Medium severity. CVSS v3 base score is 5.5 out of 10.