CISA KEV · Known exploitedCritical

CVE-2021-30116

Kaseya Virtual System/Server Administrator (VSA)

Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021. By default Kaseya VSA on premise offers a download page where the clients for the installation can be downloaded. The default URL for this page is https://x.x.x.x/dl.asp When an attacker download a client for Windows and installs it, the file KaseyaD.ini is generated (C:\Program Files (x86)\Kaseya\XXXXXXXXXX\KaseyaD.ini) which contains an Agent_Guid and AgentPassword This Agent_Guid and AgentPassword can be used to log in on dl.asp (https://x.x.x.x/dl.asp?un=840997037507813&pw=113cc622839a4077a84837...

CVSS: 9.8
EPSS: 85.7%
CISA KEV: Listed
Published: 2021.07.09

PRIORITY ASSESSMENT

Immediate review

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

Known exploitationConfirmed by CISA KEV

Exploit probability85.7%

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: Kaseya Virtual System/Server Administrator (VSA)
Affected versions: < 9.5.0.24, < 9.5.7a
Fixed versions: 9.5.0.24, 9.5.7a

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2021.11.17

1
Identify
Confirm that Kaseya Virtual System/Server Administrator (VSA) and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
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: CWE-522
KEV added: 2021.11.03
Ransomware use: 확인됨