What is CVE-2021-26607?

CVE-2021-26607 is a high-severity vulnerability in Microsoft Windows, classified under Improper Input Validation. CVSS score: 8.1/10. Published 2021-10-26.

How severe is CVE-2021-26607?

High severity. CVSS v3 base score is 8.1 out of 10.

Improper input validation in Microsoft Windows

CVE-2021-26607

An Improper input validation in execDefaultBrowser method of NEXACRO17 allows a remote attacker to execute arbitrary command on affected systems.

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

Published 2021-10-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.019 (78.5th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Microsoft Windows
Tobesoft Nexacro
Tobesoft Nexacro17 — versions 17.1.3.301

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.boho.or.kr/krcert/secNoticeView.do (Third Party Advisory)

Frequently asked questions

What is CVE-2021-26607?: CVE-2021-26607 is a high-severity vulnerability in Microsoft Windows, classified under Improper Input Validation. CVSS score: 8.1/10. Published 2021-10-26.
How severe is CVE-2021-26607?: High severity. CVSS v3 base score is 8.1 out of 10.