What is CVE-2021-29365?

CVE-2021-29365 is a medium-severity vulnerability in Irfanview, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.5/10. Published 2021-09-28.

How severe is CVE-2021-29365?

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

Vulnerability in Irfanview

CVE-2021-29365

Irfanview 4.57 is affected by an infinite loop when processing a crafted BMP file in the EFFECTS!AutoCrop_W component. This can cause a denial of service (DOS).

Published 2021-09-28 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.007 (49.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Irfanview — versions 4.57

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

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

Frequently asked questions

What is CVE-2021-29365?: CVE-2021-29365 is a medium-severity vulnerability in Irfanview, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.5/10. Published 2021-09-28.
How severe is CVE-2021-29365?: Medium severity. CVSS v3 base score is 5.5 out of 10.