What is CVE-2021-29367?

CVE-2021-29367 is a high-severity vulnerability in Irfanview, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2021-09-28.

How severe is CVE-2021-29367?

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

Buffer overflow in Irfanview

CVE-2021-29367

A buffer overflow vulnerability in WPG+0x1dda of Irfanview 4.57 allows attackers to execute arbitrary code via a crafted WPG file.

Vulnerability class: Buffer Overflow

Published 2021-09-28 · 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: 0.010 (60.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Irfanview — versions 4.57

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/moshekaplan/Research/tree/main/IrfanView (Third Party Advisory)

Frequently asked questions

What is CVE-2021-29367?: CVE-2021-29367 is a high-severity vulnerability in Irfanview, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2021-09-28.
How severe is CVE-2021-29367?: High severity. CVSS v3 base score is 7.8 out of 10.