CVE-2020-7877: Mastersoft Zook Agent

High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days.

A buffer overflow issue was discovered in ZOOK solution(remote administration tool) through processing 'ConnectMe' command while parsing a crafted OUTERIP value because of missing boundary check. This vulnerability allows the attacker to execute remote arbitrary command.

Affected products

• Mastersoft Zook Agent: version 2.0.6.1 only
• Mastersoft Zook Viewer: version 2.0.4.6 only

Published 2021-09-07. Last modified 2026-06-17.