CVE-2021-21958

Name of the Vulnerable Software and Affected Versions Hancom Office 2020 version 11.0.0.2353

Description A heap-based buffer overflow issue exists in the Hword functionality of Hancom Office, specifically in HwordApp.dll. This can be triggered by a specially-crafted malformed file, leading to memory corruption and potential arbitrary code execution. An attacker can exploit this by providing a malicious file.

Recommendations For Hancom Office 2020 version 11.0.0.2353, consider avoiding the use of HwordApp.dll functionality until a patch is available. As a temporary workaround, refrain from opening files from untrusted sources to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.