CVE-2018-20753

Name: CVE-2018-20753
Creator: NVD / NIST
Published: 2019-02-05T06:29:00.593+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 29.55%

Last modified Jun 17, 2026

CVE-2018-20753 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Kaseya VSA RMM before R9.3 9.3.0.35, R9.4 before 9.4.0.36, and R9.5 before 9.5.0.5 allows unprivileged remote attackers to execute PowerShell payloads on all managed devices. In January 2018, attackers actively exploited this vulnerability in the wild.. CISA has confirmed active exploitation in the wild. EPSS estimates a 29.55% chance of exploitation in the next 30 days.

Description

Kaseya VSA RMM before R9.3 9.3.0.35, R9.4 before 9.4.0.36, and R9.5 before 9.5.0.5 allows unprivileged remote attackers to execute PowerShell payloads on all managed devices. In January 2018, attackers actively exploited this vulnerability in the wild.

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

29.55%

98.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by May 4, 2022.

Affected Software

Vendor	Product	Versions
Kaseya	Virtual System Administrator	>= 9.3, < 9.3.0.35
Kaseya	Virtual System Administrator	>= 9.4, < 9.4.0.36
Kaseya	Virtual System Administrator	>= 9.5, < 9.5.0.5

References

https://blog.huntresslabs.com/deep-dive-kaseya-vsa-mining-payload-c0ac839a0e88Exploit, Third Party Advisory
https://helpdesk.kaseya.com/hc/en-gb/articles/360000333152Vendor Advisory
https://blog.huntresslabs.com/deep-dive-kaseya-vsa-mining-payload-c0ac839a0e88Exploit, Third Party Advisory
https://helpdesk.kaseya.com/hc/en-gb/articles/360000333152Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-20753US Government Resource

Timeline

Published: Feb 5, 2019
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2018-20753?

How severe is CVE-2018-20753?

CVE-2018-20753 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 29.55% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2018-20753?

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-2018-20753?

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

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Source: NVD / NIST