What is CVE-2022-21926?

CVE-2022-21926 is a high-severity vulnerability in Microsoft Hevc Video Extension, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2022-02-09.

How severe is CVE-2022-21926?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Microsoft Hevc Video Extension

CVE-2022-21926

HEVC Video Extensions Remote Code Execution Vulnerability

Vulnerability class: Buffer Overflow

Published 2022-02-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.023 (82.3th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000

Affected products

Microsoft Hevc Video Extension — versions 1.0.0.0
Microsoft Hevc Video Extensions — versions 1.0.0
Microsoft Hevc Video Extensions

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2022-21926 (vendor-advisory)

Frequently asked questions

What is CVE-2022-21926?: CVE-2022-21926 is a high-severity vulnerability in Microsoft Hevc Video Extension, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2022-02-09.
How severe is CVE-2022-21926?: High severity. CVSS v3 base score is 7.8 out of 10.