How severe is CVE-2018-20753?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2018-20753 known to be exploited?

Yes. CVE-2018-20753 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-04-13), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.

Vulnerability in Kaseya Virtual_system_administrator

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…

EPSS: 0.293 (98.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Kaseya Virtual_system_administrator
N/a — versions n/a

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-04-13. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-04.

Required action: Apply updates per vendor instructions.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)
cve@mitre.org (x_refsource_MISC, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2018-20753?: CVE-2018-20753 is a critical-severity vulnerability in Kaseya Virtual_system_administrator. CVSS score: 9.8/10. Published 2019-02-05.
How severe is CVE-2018-20753?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2018-20753 known to be exploited?: Yes. CVE-2018-20753 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-04-13), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.