CVE-2021-21958

HIGH 7.8CVE-2021-21958 · Published 16/02/2022 · updated 17/06/2026

In short

CVE-2021-21958 is a HIGH (CVSS 7.8) vulnerability affecting hancom office 2020 (hancom).
Chance of exploitation in the next 30 days (EPSS): 1.1%, higher than 65.7% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
hancom office 2020 hancom	`= 11.0.0.2353`	No fix yet

Description

A heap-based buffer overflow vulnerability exists in the Hword HwordApp.dll functionality of Hancom Office 2020 11.0.0.2353. A specially-crafted malformed file can lead to memory corruption and potential arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.

References

talosintelligence.com/vulnerability_reports/TALOS-2021-1386 · Exploit
blog.talosintelligence.com/2022/02/vuln-spotlight-.html · Exploit

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