What is CVE-2020-23899?

CVE-2020-23899 is a medium-severity vulnerability in Wildbit-Soft Wildbit Viewer, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2021-11-10.

How severe is CVE-2020-23899?

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

Buffer overflow in Wildbit-Soft Wildbit Viewer

CVE-2020-23899

A User Mode Write AV in Editor+0x5f91 of WildBit Viewer v6.6 allows attackers to cause a denial of service (DoS) via a crafted tga file.

Vulnerability class: Buffer Overflow

Published 2021-11-10 · 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: 0.006 (44.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.000

Affected products

Wildbit-Soft Wildbit Viewer — versions 6.6

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

www.wildbit-soft.fi/software.html (Product)
github.com/Aurorainfinity/vulnerabilities/blob/master/WildBit_Viewer/tga_file_f… (Third Party Advisory)

Frequently asked questions

What is CVE-2020-23899?: CVE-2020-23899 is a medium-severity vulnerability in Wildbit-Soft Wildbit Viewer, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2021-11-10.
How severe is CVE-2020-23899?: Medium severity. CVSS v3 base score is 5.5 out of 10.