Zero-day vulnerability in Kaseya VSA

Input validation error
CVE-2021-30116

Not patched

Known malware:

REvil

Vulnerability details

Advisory: SB2021070501 - Remote code execution in Kaseya VSA

Vulnerable component: Kaseya VSA

CVE-ID: CVE-2021-30116

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:U/RC:C

CWE-ID: CWE-20 - Improper input validation

Description:

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to unspecified error. A remote attacker can compromise the affected system.

Note, the vulnerability is being actively exploited in the wild by the REvil ransomware.

External links:

https://helpdesk.kaseya.com/hc/en-gb/articles/4403440684689

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.