Is CVE-2020-7456 actively exploited?

No active exploitation of CVE-2020-7456 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-7456 be exploited remotely?

No. CVE-2020-7456 requires physical access to exploit.

What is the CVSS score of CVE-2020-7456?

CVE-2020-7456 has a CVSS score of 6.8 (MEDIUM).

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MEDIUM

CVE-2020-7456

CWE-119Published: June 9, 2020· Updated: Jun 17, 2026

6.8

CVSS v3.1

Official Description

In FreeBSD 12.1-STABLE before r361918, 12.1-RELEASE before p6, 11.4-STABLE before r361919, 11.3-RELEASE before p10, and 11.4-RC2 before p1, an invalid memory location may be used for HID items if the push/pop level is not restored within the processing of that HID item allowing an attacker with physical access to a USB port to be able to use a specially crafted USB device to gain kernel or user-space code execution.

NVD Source

Technical Analysis

CVE-2020-7456 requires local access, meaning attackers must already have a foothold on the target system.

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 6.8.

From a weakness classification perspective (CWE-119): Buffer overflow vulnerabilities can lead to arbitrary code execution or denial of service by corrupting adjacent memory.