CVE-2021-26608

handysoft groupware arbitrary file download and execution vulnerability

CRITICAL

9.8

CVSS Score

Published: September 9, 2021 at 12:54 PM UTC

Updated: June 17, 2026 at 03:43 AM UTC

1 product affected across 1 vendorHshell· also runs on 1 platform

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Severity

CRITICAL9.8

Exploit prediction

EPSS 0.6%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Hshell · Handysoft

95%

1.7.4.5 2.0.3.5 4.0.1.6

microsoft-windows (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Windows · Microsoft

95%

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_MISCThird Party Advisory

Source: [email protected]

https://www.boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=36239

CVSS

9.8CRITICAL[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-353CWE-345

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