CVE-2020-23894

Name: CVE-2020-23894
Creator: NVD / NIST
Published: 2021-11-10T22:15:10.643+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.55%

Last modified Jun 17, 2026

CVE-2020-23894 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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.. EPSS estimates a 0.55% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS Probability

0.55%

41.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Wildbit-Soft	Wildbit Viewer	6.6

References

https://github.com/Aurorainfinity/vulnerabilities/blob/master/WildBit_Viewer/tiff_file_format.mdThird Party Advisory
https://www.wildbit-soft.fi/software.htmlProduct
https://github.com/Aurorainfinity/vulnerabilities/blob/master/WildBit_Viewer/tiff_file_format.mdThird Party Advisory
https://www.wildbit-soft.fi/software.htmlProduct

Timeline

Published: Nov 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-23894?

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.

How severe is CVE-2020-23894?

CVE-2020-23894 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.55% probability of exploitation in the next 30 days.

How do I fix CVE-2020-23894?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-23894?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST