CVE-2018-20753

Kaseya Virtual System/Server Administrator (VSA): VSA Remote Code Execution

As of , CVE-2018-20753 in Kaseya Virtual System/Server Administrator (VSA) is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch this week.

Exploited
Yes: CISA listed it on 13 April 2022
US federal deadline
4 May 202221 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Known
EPSS score
0.29Higher than 98% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
EPSS when listed
0.01 on 13 April 2022EPSS on the day CISA listed it.
Public exploit
None foundNeither Metasploit nor Exploit-DB lists one.
Fix
No vendor link in CISA's entry

What CISA says to do

Apply updates per vendor instructions.

CISA's required action

What the flaw is

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

CISA's 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.

The CVE record's description, from mitre

CVE published
5 February 2019
Assigned by
mitre
CVSS
9.8 Critical (CVSS 3.1, from CISA-ADP)
CISA SSVC, exploitation
active
CISA SSVC, automatable
yes
CISA SSVC, technical impact
total

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. The US federal deadline to fix it.

Virtual System/Server Administrator (VSA): other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2017-18362VSA SQL InjectionKaseya Virtual System/Server Administrator (VSA)Patch this weekRansomware use; EPSS 0.870.87
CVE-2021-30116Information DisclosureKaseya Virtual System/Server Administrator (VSA)Patch this weekRansomware use; EPSS 0.860.86

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