What is CVE-2021-40212?

CVE-2021-40212 is a critical-severity vulnerability in Daum Potplayer, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2022-06-15.

How severe is CVE-2021-40212?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Daum Potplayer

CVE-2021-40212

An exploitable out-of-bounds write vulnerability in PotPlayer 1.7.21523 build 210729 may lead to code execution, information disclosure, and denial of service.

Vulnerability class: Buffer Overflow

Published 2022-06-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.021 (80.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.021 · change: +0.001

Affected products

Daum Potplayer — versions 1.7.21523

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

a-man-in-the-cookie.blogspot.com (Third Party Advisory)
a-man-in-the-cookie.blogspot.com/2021/08/PotPlayer-Critical-Memory-Access-Viola… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-40212?: CVE-2021-40212 is a critical-severity vulnerability in Daum Potplayer, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2022-06-15.
How severe is CVE-2021-40212?: Critical severity. CVSS v3 base score is 9.8 out of 10.