CVE-2021-43040
CVSS v3
8.8
HIGH
EPSS Score
1.8 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. The privileged vaultServer could be leveraged to create arbitrary writable files, leading to privilege escalation.
Technical details
- Published
- 2021-12-06
Frequently asked questions
What is CVE-2021-43040?
An issue was discovered in Kaseya Unitrends Backup Appliance before 10.5.5. The privileged vaultServer could be leveraged to create arbitrary writable files, leading to privilege escalation.
Is CVE-2021-43040 actively exploited?
Active exploitation of CVE-2021-43040 has not been confirmed. Its EPSS score was 1.8% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-43040?
CVE-2021-43040 has a CVSS v3 base score of 8.8 (HIGH severity).
Is CVE-2021-43040 affecting your environment?
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