CVE-2020-23894: Wildbit-Soft Wildbit Viewer

Medium severity, CVSS 5.5. EPSS: 0.6% chance of exploitation in the next 30 days.

A User Mode Write AV in ntdll!RtlpCoalesceFreeBlocks+0x268 of WildBit Viewer v6.6 allows attackers to cause a denial of service (DoS) via a crafted tiff file.

Affected products

• Wildbit-Soft Wildbit Viewer: version 6.6 only

Published 2021-11-10. Last modified 2026-06-17.