Is CVE-2021-26608 actively exploited?

No active exploitation of CVE-2021-26608 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-26608 be exploited remotely?

Yes. CVE-2021-26608 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-26608?

CVE-2021-26608 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-26608

CRITICAL

CVE-2021-26608

CWE-353Published: September 9, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

An arbitrary file download and execution vulnerability was found in the HShell.dll of handysoft Co., Ltd groupware ActiveX module. This issue is due to missing support for integrity check of download URL or downloaded file hash.

NVD Source

Technical Analysis

CVE-2021-26608 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.