CVE-2021-40391
CRITICALEPSS 86th pctlDescription
An out-of-bounds write vulnerability exists in the drill format T-code tool number functionality of Gerbv 2.7.0, dev (commit b5f1eacd), and the forked version of Gerbv (commit 71493260). A specially-crafted drill file can lead to code execution. An attacker can provide a malicious file to trigger this vulnerability.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Elevated risk: more likely to be exploited than 86% of all known CVEs.
References
Related Vulnerabilities
Other CWE-390 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2024-30255 | Medium | 5.3 | 88% | - | Fix |
| CVE-2024-27919 | High | 7.5 | 87% | - | - |
| CVE-2025-26465 | Medium | 6.8 | 7.4% | - | Fix |
| CVE-2019-5051 | High | 8.8 | 4.0% | - | Fix |
| CVE-2017-7485 | Medium | 5.9 | 2.0% | - | - |
| CVE-2024-12086 | Medium | 6.1 | 1.8% | - | Fix |
Common questions
How do I fix CVE-2021-40391?
Upgrade gerbv on debian 11 to 2.7.0-2+deb11u1 or later.
Is CVE-2021-40391 being actively exploited?
Not that we know of. CVE-2021-40391 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 2.9% is the estimated probability that it will be exploited in the next 30 days. That is higher than 86% of all scored CVEs.
How severe is CVE-2021-40391?
CVE-2021-40391 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2021-40391 affect?
Published advisories record a fix for gerbv (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2021-40391
Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.