hwpapp.dll in Hangul Word Processor allows remote attackers to execute arbitrary code via a crafted heap spray, and by leveraging a "type confusion" via an HWPX file containing a crafted para text tag.
https://www.fireeye.com/content/dam/fireeye-www/global/en/blog/threat-research/FireEye_HWP_ZeroDay.pdf
https://www.fireeye.com/blog/threat-research/2015/09/zero-day_hwp_exploit.html
http://www.securityfocus.com/bid/76694
http://www.hancom.com/cs_center/csDownload.do
Source: Mitre, NVD
Published: 2017-07-25
Updated: 2026-05-13
Base Score: 6.8
Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P
Severity: Medium
Base Score: 7.8
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Severity: High
EPSS: 0.0033