CVE-2021-40393

Name: CVE-2021-40393
Creator: NVD / NIST
Published: 2021-12-22T19:15:11.42+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.06%

Last modified Jun 17, 2026

CVE-2021-40393 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An out-of-bounds write vulnerability exists in the RS-274X aperture macro variables handling functionality of Gerbv 2.7.0 and dev (commit b5f1eacd) and the forked version of Gerbv (commit 71493260). A specially-crafted gerber file can lead to code execution. EPSS estimates a 3.06% chance of exploitation in the next 30 days.

Description

An out-of-bounds write vulnerability exists in the RS-274X aperture macro variables handling functionality of Gerbv 2.7.0 and dev (commit b5f1eacd) and the forked version of Gerbv (commit 71493260). A specially-crafted gerber file can lead to code execution. An attacker can provide a malicious file to trigger this vulnerability.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.06%

85.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Gerbv Project	Gerbv	2.7.0
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0

References

Timeline

Published: Dec 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40393?

How severe is CVE-2021-40393?

CVE-2021-40393 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.06% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40393?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-40393?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST