Is CVE-2021-40400 actively exploited?

No active exploitation of CVE-2021-40400 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-40400 be exploited remotely?

Yes. CVE-2021-40400 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-40400?

CVE-2021-40400 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2021-40400

CWE-119Published: April 14, 2022· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

An out-of-bounds read vulnerability exists in the RS-274X aperture macro outline primitive functionality of Gerbv 2.7.0 and dev (commit b5f1eacd) and the forked version of Gerbv (commit d7f42a9a). A specially-crafted Gerber file can lead to information disclosure. An attacker can provide a malicious file to trigger this vulnerability.

NVD Source

Technical Analysis

CVE-2021-40400 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

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), with a CVSS base score of 7.5.

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