Is CVE-2018-20753 actively exploited?

CVE-2018-20753 has no public evidence of in-the-wild exploitation as of 2025-11-07.

What is the CVSS score for CVE-2018-20753?

CVE-2018-20753 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2018-20753?

Patch guidance is available from kaseya security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2018-20753.

Fix CVE-2018-20753 - CRITICAL

Q: Which products are affected by CVE-2018-20753?

3 products: kaseya virtual system administrator, kaseya virtual system administrator, kaseya virtual system administrator.

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: NVD-CWE-noinfo

Metadata

Primary Vendor: KASEYA
Published: 2/5/2019
Last Modified: 11/7/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

kaseya : virtual_system_administratorkaseya : virtual_system_administratorkaseya : virtual_system_administrator

Remediation Guidance

Executive Summary

View on NIST NVD