CVE-2021-40394

Name: CVE-2021-40394
Creator: NVD / NIST
Published: 2021-12-22T19:15:11.46+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.92%

Last modified Jun 17, 2026

CVE-2021-40394 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 2.92% 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

2.92%

85.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

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

https://lists.debian.org/debian-lts-announce/2023/09/msg00040.html
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1404Exploit, Third Party Advisory
https://www.debian.org/security/2022/dsa-5306Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00040.html
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1404Exploit, Third Party Advisory
https://www.debian.org/security/2022/dsa-5306Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-40394?

How severe is CVE-2021-40394?

CVE-2021-40394 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.92% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40394?

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-2021-40394?

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

Scan your code now

Source: NVD / NIST