Is CVE-2021-21406 actively exploited?

No active exploitation of CVE-2021-21406 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-21406 be exploited remotely?

Yes. CVE-2021-21406 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-21406?

CVE-2021-21406 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2021-21406

CWE-77Published: July 21, 2021· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

Combodo iTop is an open source, web based IT Service Management tool. In versions prior to 2.7.4, there is a command injection vulnerability in the Setup Wizard when providing Graphviz executable path. The vulnerability is patched in version 2.7.4 and 3.0.0.

NVD Source

Technical Analysis

CVE-2021-21406 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

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 8.8.