CVE-2020-9451

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-05-25 · updated 2026-06-17
Weakness: CWE-276

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.

Affected products

Acronis True Image 2020: 24.5.22510

References

https://danishcyberdefence.dk/blog
https://madsjoensen.dk/cve-2020-9451/
https://www.acronis.com
https://danishcyberdefence.dk/blog
https://madsjoensen.dk/cve-2020-9451/
https://www.acronis.com

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