CVE-2020-9451 json
An issue was discovered in Acronis True Image 2020 24.5.22510.
published 2021-05-25 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-30270
- cvss
- 5.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 32%
- public exploits
- 0
- none known
Summary
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.
Exploit prediction
0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- madsjoensen.dk https://madsjoensen.dk/cve-2020-9451/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 2.1 | AV:L/AC:L/Au:N/C:N/I:N/A:P |
Classification
- Weakness
-
- CWE-276 Incorrect Default Permissions
References
-
madsjoensen.dk
/cve-2020-9451/
exploit, third-party-advisory
-
acronis.com
vendor-advisory
-
danishcyberdefence.dk
/blog
third-party-advisory
Sources
- CVE List CVE-2020-9451
- NVD CVE-2020-9451
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