PatchTheCVECVE-2021-40385: An issue was discovered in the server software in Kaseya Unitrends Backup Software before 10.5.5-2
CVE-2021-40385 is a high-severity flaw (CVSS 8.8) affecting unitrends backup software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An issue was discovered in the server software in Kaseya Unitrends Backup Software before 10.5.5-2. There is a privilege escalation from read-only user to admin.
Why this priority
- High severity
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 1.1% (top 34%) |
| CISA exploited list | No |
| Published | 2021-09-01 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-40385?
unitrends backup software: upgrade to 10.5.5-2. Exact commands for each OS are on this page.
Is CVE-2021-40385 being exploited?
CVE-2021-40385 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-40385 affect?
CVE-2021-40385 affects unitrends backup software. Severity is high (CVSS 8.8). An issue was discovered in the server software in Kaseya Unitrends Backup Software before 10.5.5-2. There is a privilege escalation from read-only user to admin.
How urgent is CVE-2021-40385?
Priority 47/100. High severity
Related CVEs
- CVE-2021-40387 HIGH 8.8 UPGRADE An issue was discovered in the server software in Kaseya Unitrends Backup Software before 10.5.5-2