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Vulnerabilities

Vulnerability · CVE-2018-20753

Kaseya VSA Remote Code Execution Vulnerability

Published Jan 30, 2018 · catalog updated Aug 12, 2026 · Kaseya Virtual System/Server Administrator (VSA)

Patch now

CVE-2018-20753 is in the CISA known-exploited catalog, due May 4, 2022. Confirm Kaseya Virtual System/Server Administrator (VSA) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
29.55%
Remediation
Remediation guidance
Affected products
cpe kaseya/virtual system administrator · vendor Kaseya Virtual System/Server Administrator (VSA)

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe kaseya/virtual system administratorversion unspecified
  • vendor Kaseya Virtual System/Server Administrator (VSA)version unspecified

How to fix CVE-2018-20753

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2018-20753 is in the CISA known-exploited catalog, due May 4, 2022. Confirm Kaseya Virtual System/Server Administrator (VSA) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply updates per vendor instructions.

What should an analyst verify?

No weakness class is stored. EPSS 29.55%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 4, 2019 · Catalog

    Detected

    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.

  2. Apr 13, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. May 4, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Aug 12, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2018-20753

    Kaseya VSA RMM allows unprivileged remote attackers to execute PowerShell payloads on all managed devices.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2018-20753

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2018-20753

    30-day exploitation probability 29.6%

    first.org
  • NIST NVDVulnerability recordCVE-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.

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2018-20753

    Kaseya VSA RMM allows unprivileged remote attackers to execute PowerShell payloads on all managed devices.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.