Is CVE-2020-17399 actively exploited?

No active exploitation of CVE-2020-17399 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-17399 be exploited remotely?

No. CVE-2020-17399 requires local access to exploit.

What is the CVSS score of CVE-2020-17399?

CVE-2020-17399 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2020-17399

CWE-129Published: August 25, 2020· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 15.1.4. 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 prl_hypervisor kext. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the kernel. Was ZDI-CAN-11303.

NVD Source

Technical Analysis

CVE-2020-17399 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), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

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.