Is CVE-2018-20753 in the CISA KEV catalog?

Yes. CVE-2018-20753 is on the CISA Known Exploited Vulnerabilities list, added 2022-04-13, and has known ransomware campaign use.

What is the CVSS severity of CVE-2018-20753?

CVE-2018-20753 has a CVSS v3 base score of 9.8 (CRITICAL).

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

CVE-2018-20753 has an EPSS score of 29.55% (98th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2018-20753

CRITICALCISA KEVEPSS 98th pctl

9.8

CVSS v3

NVD

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.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

29.55%probability of exploitation in 30 days

98thpercentile

Very high risk: more likely to be exploited than 98% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Kaseya VSA Remote Code Execution Vulnerability

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

Apply updates per vendor instructions.

Remediation due: 2022-05-04

Associated with ransomware campaigns

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-07.