AEGLIX vulnerability intelligence
CVE-2021-30116
CRITICAL · CVSS 10.0 · Analyzed
Published: 2021-07-09 · Updated: 2026-08-14 · Source: NVD
Continue your research
Connect this record to stored reporting, reviewed campaign mentions and source-domain investigation. These are research leads, not inferred attack relationships.
Open CVE research in Investigate · Find Arsenal listings referencing this CVE
Vulnerability overview
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=113cc622839a4077a84837485ced6b93e440bf66d44057713cb2f95e503a06d9) This request authenticates the client and returns a sessionId cookie that can be used in subsequent attacks to bypass authentication. Security issues discovered --- * Unauthenticated download page leaks credentials * Credentials of agent software can be used to obtain a sessionId (cookie) that can be used for services not intended for use by agents * dl.asp accepts credentials via a GET request * Access to KaseyaD.ini gives an attacker access to sufficient information to penetrate the Kaseya installation and its clients. Impact --- Via the page /dl.asp enough information can be obtained to give an attacker a sessionId that can be used to execute further (semi-authenticated) attacks against the system.
Severity and scoring
- CVSS score
- 10.0 · CRITICAL
- CVSS version
- 3.1
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weaknesses
- CWE-522
CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.
Known exploitation and remediation
Listed in CISA’s Known Exploited Vulnerabilities catalog.
- Affected product
- Kaseya · Virtual System/Server Administrator (VSA)
- Added to catalog
- 2021-11-03
- Required action
- Apply updates per vendor instructions.
- CISA remediation due date
- 2021-11-17
CISA deadlines apply to the organizations covered by its directives. Confirm your own remediation requirements.
Verify affected versions and patch availability in the vendor advisory before making changes.
Affected products and versions
cpe:2.3:a:kaseya:vsa_agent:*:*:*:*:*:*:*:*
Before (exclusive): 9.5.0.24
cpe:2.3:a:kaseya:vsa_server:*:*:*:*:*:*:*:*
Before (exclusive): 9.5.7a
These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.
Advisories and references
- https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/
Third Party Advisory
- https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/
Third Party Advisory
- https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021
Vendor Advisory
- https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/
Exploit · Third Party Advisory
- https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/
Third Party Advisory
- https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/
Third Party Advisory
- https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021
Vendor Advisory
- https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/
Exploit · Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30116
US Government Resource