CVE-2020-7877: ZOOK solution(remote administration tool) buffer overflow vulnerability

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-09-07 · updated 2026-06-17
Weakness: CWE-120

Description

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: 2.0.6.1
mastersoft Zook Viewer: 2.0.4.6

References

https://www.boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=36216
https://www.boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=36216

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