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CVE-2018-20753

9.8, critical Known exploited Used in ransomware

Kaseya VSA Remote Code Execution Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
30% higher than 98.1% of scored CVEs
Exploitation
Confirmed in the wild
Published
5 Feb 20197 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 13 Apr 2022 and links it to ransomware activity. US federal agencies had to remediate by 4 May 2022, a deadline that has passed.

Required action. Apply updates per vendor instructions.

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.

Details

Vendor
Kaseya
Product
Virtual System Administrator
Weakness
n/a
Status
Analyzed
Updated
13 Aug 2026
Assigner
cve@mitre.org

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

References 3

Exploit code 1

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Kaseya CVEs

Every Kaseya CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2021-30116 Kaseya Virtual System/Server Administrator (VSA) Information Disclosure Vulnerability KEV EPSS 86% 9.8, critical
  • CVE-2017-18362 Kaseya VSA SQL Injection Vulnerability KEV EPSS 87% 9.8, critical

Beyond this page

Is CVE-2018-20753 in your network?

This page tells you how dangerous CVE-2018-20753 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2018-20753 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2018-20753 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.