CVE-2021-40387

CVE-2021-40387 is a high-severity vulnerability in Kaseya Unitrends Backup Software with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

An issue was discovered in the server software in Kaseya Unitrends Backup Software before 10.5.5-2. There is authenticated remote code execution.

Frequently asked questions

What is CVE-2021-40387?
An issue was discovered in the server software in Kaseya Unitrends Backup Software before 10.5.5-2. There is authenticated remote code execution.
How severe is CVE-2021-40387?
CVE-2021-40387 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-40387 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40387?
CVE-2021-40387 affects Kaseya Unitrends Backup Software. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40387?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-40387 published?
CVE-2021-40387 was published on 2021-09-01 and last updated on 2026-06-17.

References

Affected products (1)

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