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.
References
| Link | Resource |
|---|---|
| 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 |
Configurations
Configuration 1 (hide)
|
History
22 Oct 2025, 00:17
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
21 Oct 2025, 20:18
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
21 Oct 2025, 19:19
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
21 Nov 2024, 06:03
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : 7.5
v3 : 10.0 |
| References | () https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/ - Third Party Advisory | |
| References | () https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/ - Third Party Advisory | |
| References | () https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021 - Vendor Advisory | |
| References | () https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/ - Exploit, Third Party Advisory |
29 Jul 2024, 18:30
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://www.secpod.com/blog/kaseya-vsa-zero-day-by-revil/ - Exploit, Third Party Advisory |
08 Aug 2023, 14:21
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-522 |
12 Jul 2022, 17:42
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | NVD-CWE-noinfo |
04 Apr 2022, 07:15
| Type | Values Removed | Values Added |
|---|---|---|
| Summary | 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. |
19 Aug 2021, 16:22
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:kaseya:vsa_server:*:*:*:*:*:*:*:* cpe:2.3:a:kaseya:vsa_agent:*:*:*:*:*:*:*:* |
09 Jul 2021, 20:05
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:kaseya:vsa:*:*:*:*:-:*:*:* | |
| CWE | CWE-522 | |
| CVSS |
v2 : v3 : |
v2 : 7.5
v3 : 9.8 |
| References | (MISC) https://csirt.divd.nl/2021/07/07/Kaseya-Limited-Disclosure/ - Third Party Advisory | |
| References | (MISC) https://csirt.divd.nl/2021/07/04/Kaseya-Case-Update-2/ - Third Party Advisory | |
| References | (MISC) https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689-Important-Notice-July-2nd-2021 - Vendor Advisory |
09 Jul 2021, 15:01
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2021-07-09 14:15
Updated : 2025-10-22 00:17
NVD link : CVE-2021-30116
Mitre link : CVE-2021-30116
CVE.ORG link : CVE-2021-30116
JSON object : View
Products Affected
kaseya
- vsa_server
- vsa_agent
CWE
CWE-522
Insufficiently Protected Credentials