CVE-2020-9451

Name: CVE-2020-9451
Creator: NVD / NIST
Published: 2021-05-25T12:15:07.797+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.38%

Last modified Jun 17, 2026

CVE-2020-9451 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. An issue was discovered in Acronis True Image 2020 24.5.22510. anti_ransomware_service.exe keeps a log in a folder where unprivileged users have write permissions. EPSS estimates a 0.38% chance of exploitation in the next 30 days.

Description

An issue was discovered in Acronis True Image 2020 24.5.22510. anti_ransomware_service.exe keeps a log in a folder where unprivileged users have write permissions. The logs are generated in a predictable pattern, allowing an unprivileged user to create a hardlink from a (not yet created) log file to anti_ransomware_service.exe. On reboot, this forces the anti_ransomware_service to try to write its log into its own process, crashing in a SHARING VIOLATION. This crash occurs on every reboot.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.38%

30.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-276

Affected Software

Vendor	Product	Versions
Acronis	True Image 2020	24.5.22510

References

https://danishcyberdefence.dk/blogThird Party Advisory
https://madsjoensen.dk/cve-2020-9451/Exploit, Third Party Advisory
https://www.acronis.comVendor Advisory
https://danishcyberdefence.dk/blogThird Party Advisory
https://madsjoensen.dk/cve-2020-9451/Exploit, Third Party Advisory
https://www.acronis.comVendor Advisory

Timeline

Published: May 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-9451?

How severe is CVE-2020-9451?

CVE-2020-9451 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.

How do I fix CVE-2020-9451?

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-2020-9451?

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

Scan your code now

Source: NVD / NIST