CISA KEV · Known exploitedCritical

CVE-2018-20753

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.

CVSS
9.8
EPSS
29.3%
98.0% percentile
CISA KEV
Listed
Published
2019.02.05
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability29.3%
Technical severityCVSS 9.8

Vulnerability overview

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.

Affected product and versions

Product
Kaseya Virtual System/Server Administrator (VSA)
Affected versions
>= 9.3 < 9.3.0.35, >= 9.4 < 9.4.0.36, >= 9.5 < 9.5.0.5
Fixed versions
9.3.0.35, 9.4.0.36, 9.5.0.5

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2022.05.04
  1. 1
    Identify

    Confirm that Kaseya Virtual System/Server Administrator (VSA) and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
KEV added
2022.04.13
Ransomware use
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CVE-2018-20753 — Kaseya Virtual System/Server Administrator (VSA) | SECUFOCUS NOW