CVE-2021-40387
An issue was discovered in the server software in Kaseya Unitrends Backup Software before 10.5.5...
An issue was discovered in the server software in Kaseya Unitrends Backup Software before 10.5.5-2. There is authenticated remote code execution.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in the server software in Kaseya Unitrends Backup Software before 10.5.5-2. There is authenticated remote code execution.
- Record
CVE-2021-40387- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 9.0 High
AV:N/AC:L/Au:S/C:C/I:C/A:C - Updated
- 2026-11-02
CVE List No score
An issue was discovered in the server software in Kaseya Unitrends Backup Software before 10.5.5-2. There is authenticated remote code execution.
- Record
CVE-2021-40387- Updated
- 2026-11-02
EUVDEUVD-2021-27564 No score
An issue was discovered in the server software in Kaseya Unitrends Backup Software before 10.5.5-2. There is authenticated remote code execution.
- Record
EUVD-2021-27564- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-fw24-832r-x4vh No score
An issue was discovered in the server software in Kaseya Unitrends Backup Software before 10.5.5...
An issue was discovered in the server software in Kaseya Unitrends Backup Software before 10.5.5-2. There is authenticated remote code execution.
- Record
GHSA-fw24-832r-x4vh- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-40387 is a high vulnerability (CVSS 8.8) in Kaseya Unitrends Backup Software, published September 1, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.43%, the 84th percentile. No source names a fixed version.