Is CVE-2020-17391 actively exploited?

No active exploitation of CVE-2020-17391 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-17391 be exploited remotely?

No. CVE-2020-17391 requires local access to exploit.

What is the CVSS score of CVE-2020-17391?

CVE-2020-17391 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2020-17391

CWE-749Published: August 25, 2020· Updated: Jun 17, 2026

6.5

CVSS v3.1

Official Description

This vulnerability allows local attackers to disclose information on affected installations of Parallels Desktop 15.1.3-47255. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handler for HOST_IOCTL_INIT_HYPERVISOR in the prl_hypervisor kext. The issue results from the exposure of dangerous method or function to the unprivileged user. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the kernel. Was ZDI-CAN-10518.

NVD Source

Technical Analysis

CVE-2020-17391 requires local access, meaning attackers must already have a foothold on the target system.

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), with a CVSS base score of 6.5.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.