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ExploitedIn CISA KEVFix available

CVE-2018-20753

Exploitation confirmed. First attested on 2022-04-13 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2019-02-05
  • Fixed in9.5.0.5 · 9.4.0.36 · 9.3.0.35

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2019-02-0506:29CVE publishedNVD
  2. 2022-04-13Added to the CISA KEV catalogCISA KEV
  3. 2022-04-13Listed as exploited by GCVEGCVE
  4. 2022-04-13Exploitation first reportedCISA KEV
  5. 2025-02-0420:37SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-20753?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-20753?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Kaseya virtual system administrator
BranchAffectedFixed in
9.5≥ 9.5, < 9.5.0.59.5.0.5
9.4≥ 9.4, < 9.4.0.369.4.0.36
9.3≥ 9.3, < 9.3.0.359.3.0.35

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Kaseya virtual system administrator to 9.5.0.5 · 9.4.0.36 · 9.3.0.35
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-05-04

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-04-13
Patch Due Date
2022-05-04
Ransomware Use
Known
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2019-02-05
Last Modified
2026-08-13
NVD status
Analyzed
GitHub Advisory
GHSA-hhg2-f289-m44w

Frequently asked questions

What is CVE-2018-20753?

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.

Is CVE-2018-20753 actively exploited?

Yes. CVE-2018-20753 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-05-04.

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

CVE-2018-20753 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record