CVE-2021-40386

Name: CVE-2021-40386
Creator: NVD / NIST
Published: 2022-04-15T05:15:06.507+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.77%

Last modified Jun 17, 2026

CVE-2021-40386 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Kaseya Unitrends Client/Agent through 10.5,5 allows remote attackers to execute arbitrary code.. EPSS estimates a 1.77% chance of exploitation in the next 30 days.

Description

Kaseya Unitrends Client/Agent through 10.5,5 allows remote attackers to execute arbitrary code.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.77%

75.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Kaseya	Unitrends Backup	<= 10.5.5

References

https://csirt.divd.nl/cves/CVE-2021-40386/Third Party Advisory
https://csirt.divd.nl/cves/CVE-2021-40386/Third Party Advisory

Timeline

Published: Apr 15, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40386?

Kaseya Unitrends Client/Agent through 10.5,5 allows remote attackers to execute arbitrary code.

How severe is CVE-2021-40386?

CVE-2021-40386 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.77% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40386?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-40386?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST