CVE-2020-35843: Faststone Image Viewer

Medium severity, CVSS 5.5. EPSS: 0.7% chance of exploitation in the next 30 days.

FastStone Image Viewer 7.5 has an out-of-bounds write (via a crafted image file) at FSViewer.exe+0x956e.

Affected products

• Faststone Image Viewer: version 7.5 only

Published 2021-01-26. Last modified 2026-06-17.