CVE-2018-20753
CVE-2018-20753 is a critical-severity vulnerability in Kaseya Virtual System Administrator with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-04-13).
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 7.5
- EPSS exploit prediction: 30% (98th percentile)
- Actively exploited: Yes — listed in CISA KEV (added 2022-04-13)
- EU (EUVD) id: EUVD-2018-13296
- EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-04-13)
- Affected product: Kaseya Virtual System Administrator
- Published:
- Last modified:
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.
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.
- How severe is CVE-2018-20753?
- CVE-2018-20753 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2018-20753 being actively exploited?
- Yes. CVE-2018-20753 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-04-13, which means active exploitation has been confirmed. It should be prioritised for remediation.
- What products are affected by CVE-2018-20753?
- CVE-2018-20753 affects Kaseya Virtual System Administrator. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2018-20753?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
- Does CVE-2018-20753 have an EU (EUVD) identifier?
- Yes. CVE-2018-20753 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-13296. It is also flagged as exploited in the EUVD (since 2022-04-13).
- When was CVE-2018-20753 published?
- CVE-2018-20753 was published on 2019-02-05 and last updated on 2026-06-17.
References
- https://blog.huntresslabs.com/deep-dive-kaseya-vsa-mining-payload-c0ac839a0e88
- https://helpdesk.kaseya.com/hc/en-gb/articles/360000333152
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-20753
Affected products (1)
- cpe:2.3:a:kaseya:virtual_system_administrator:*:*:*:*:*:*:*:*
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