What’s Vulnerable › Vulnerabilities

CVE-2021-21958

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-02-16 · updated 2026-06-17
• Weakness: CWE-122

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.

Affected products

• Hancom Office 2020: 11.0.0.2353

References

• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1386
• https://blog.talosintelligence.com/2022/02/vuln-spotlight-.html
• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1386

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