CVE Watch14 ago 2026

CVE-2021-30116

Kaseya Virtual System/Server Administrator (VSA) Information Disclosure Vulnerability

CVSS

10.0

Crítico

EPSS

85.7%

p100

KEV

SÍ

3 nov 2021

Exploit Today

0-100

Publicado: 9 jul 2021 · Última mod.: 14 ago 2026 · CWE-522

EPSS · 30d

85.7%EPSS · 30 días85.7%

2026-09-162026-10-14

Ficha del catálogo KEV

Producto

Kaseya / Virtual System/Server Administrator (VSA)

Vulnerabilidad

Kaseya Virtual System/Server Administrator (VSA) Information Disclosure Vulnerability

Añadido a KEV

3 nov 2021

Remediar antes de

17 nov 2021

Uso conocido en ransomware

Sí

Descripción resumida

Kaseya Virtual System/Server Administrator (VSA) contains an information disclosure vulnerability allowing an attacker to obtain the sessionId that can be used to execute further attacks against the system.

Acción requerida

Apply updates per vendor instructions.

Notas

https://nvd.nist.gov/vuln/detail/CVE-2021-30116

Descripción técnica

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.

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