What is CVE-2018-5195?

CVE-2018-5195 is a critical-severity vulnerability in Hancom Office Hword Neo, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2018-01-17.

How severe is CVE-2018-5195?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Hancom Office Hword Neo

CVE-2018-5195

Hancom NEO versions 9.6.1.5183 and earlier have a buffer Overflow vulnerability that leads remote attackers to execute arbitrary commands when performing the hyperlink Attributes in document.

Vulnerability class: Buffer Overflow

Published 2018-01-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.026 (84.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 84.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: 0.000

Affected products

Hancom Office Hword Neo — versions 9.6.1.5183 and earlier
Hancom Thinkfree Office Neo

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

www.krcert.or.kr/krcert/secNoticeView.do (VDB Entry, Third Party Advisory)
help.hancom.com/cve/hoffice/en-US/CVE_en_050_01.htm (Vendor Advisory)

Frequently asked questions

What is CVE-2018-5195?: CVE-2018-5195 is a critical-severity vulnerability in Hancom Office Hword Neo, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2018-01-17.
How severe is CVE-2018-5195?: Critical severity. CVSS v3 base score is 9.8 out of 10.