CVE-2020-35844

Name: CVE-2020-35844
Creator: NVD / NIST
Published: 2021-01-26T18:15:54.91+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.92%

Last modified Jun 17, 2026

CVE-2020-35844 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. FastStone Image Viewer 7.5 has an out-of-bounds write (via a crafted image file) at FSViewer.exe+0xbe9c4.. EPSS estimates a 0.92% chance of exploitation in the next 30 days.

Description

FastStone Image Viewer 7.5 has an out-of-bounds write (via a crafted image file) at FSViewer.exe+0xbe9c4.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.92%

55.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Faststone	Image Viewer	7.5

References

https://github.com/DmitryMeD/pentesting/blob/main/FastStone%20Image%20Viewer%207.5.mdExploit, Third Party Advisory
https://twitter.com/DmitriyMelikovThird Party Advisory
https://github.com/DmitryMeD/pentesting/blob/main/FastStone%20Image%20Viewer%207.5.mdExploit, Third Party Advisory
https://twitter.com/DmitriyMelikovThird Party Advisory

Timeline

Published: Jan 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-35844?

FastStone Image Viewer 7.5 has an out-of-bounds write (via a crafted image file) at FSViewer.exe+0xbe9c4.

How severe is CVE-2020-35844?

CVE-2020-35844 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.92% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35844?

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-2020-35844?

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

Scan your code now

Source: NVD / NIST