What is CVE-2021-26618?

CVE-2021-26618 is a high-severity vulnerability in Microsoft Windows, classified under Improper Input Validation. CVSS score: 7.1/10. Published 2022-02-18.

How severe is CVE-2021-26618?

High severity. CVSS v3 base score is 7.1 out of 10.

Improper input validation in Microsoft Windows

CVE-2021-26618

An improper input validation leading to arbitrary file creation was discovered in ToWord of ToOffice. Remote attackers use this vulnerability to execute arbitrary file included malicious code.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2022-02-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.5th percentile), scored 2026-10-07.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Microsoft Windows
Tmax Tooffice
Tmaxsoft Co., Ltd Tooffice — versions unspecified

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.krcert.or.kr/krcert/secNoticeView.do (VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2021-26618?: CVE-2021-26618 is a high-severity vulnerability in Microsoft Windows, classified under Improper Input Validation. CVSS score: 7.1/10. Published 2022-02-18.
How severe is CVE-2021-26618?: High severity. CVSS v3 base score is 7.1 out of 10.