An out-of-bounds write vulnerability exists in the RS-274X aperture macro variables handling functionality of Gerbv 2.7.0 and dev (commit b…

published 2021-12-22 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-27571

cvss: 10.0; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 3.0%; EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits: 0; none known

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.

Patch / fix

distros 2

debian ubuntu

gerbv Debian 13, Debian 12 2.8.1-1

debian advisories DEBIAN-CVE-2021-40394

gerbv Ubuntu 20.04 LTS 2.7.0-1ubuntu0.1
gerbv Ubuntu Pro 14.04 LTS 2.6.0-1ubuntu0.14.04.1~esm1
gerbv Ubuntu Pro 16.04 LTS 2.6.0-1ubuntu0.16.04.1~esm1
gerbv Ubuntu Pro 18.04 LTS 2.6.1-3ubuntu0.1~esm1
gerbv Ubuntu Pro 22.04 LTS 2.8.2-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-40394

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Exploit prediction

2.99% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

talosintelligence.com https://talosintelligence.com/vulnerability_reports/TALOS-2021-1404 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.0	10.0	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

n/a Gerbv

Classification

Weakness

CWE-787 Out-of-bounds Write

References

talosintelligence.com /vulnerability_reports/TALOS-2021-1404
exploit, third-party-advisory
debian.org /security/2022/dsa-5306
vendor-advisory, third-party-advisory
lists.debian.org /debian-lts-announce/2023/09/msg00040.html
mailing-list

Sources

CVE List CVE-2021-40394
NVD CVE-2021-40394

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary