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No exploitation reportedFix available

CVE-2021-40391

No exploitation reported by the sources we read.

  • Published2021-11-19
  • WeaknessCWE-390 · CWE-755 · CWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2021-11-1919:15CVE publishedNVD

Versions per branch

NVD
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published
Fedoraproject fedora
BranchAffectedFixed in
36.x= 36no fix published
Gerbv project gerbv
BranchAffectedFixed in
2.7= 2.7.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • gerbvUbuntu:Pro:22.04:LTSall versions · fixed in 2.8.2-1ubuntu0.1~esm1
  • gerbvUbuntu:Pro:18.04:LTSall versions · fixed in 2.6.1-3ubuntu0.1~esm1
  • gerbvUbuntu:Pro:16.04:LTSall versions · fixed in 2.6.0-1ubuntu0.16.04.1~esm1
  • gerbvUbuntu:Pro:14.04:LTSall versions · fixed in 2.6.0-1ubuntu0.14.04.1~esm1
  • gerbvUbuntu:20.04:LTSall versions · fixed in 2.7.0-1ubuntu0.1
  • gerbvMageia:8all versions · fixed in 2.7.3-1.mga8
  • gerbvDebian:13all versions · fixed in 2.7.1-1
  • gerbvDebian:12all versions · fixed in 2.7.1-1

1 more package range on OSV.dev

Vendor advisories

  • CVE-2021-40391 Red Hat Product Security

    Gerbv: out-of-bounds write in the drill format T-code tool number functionality

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.19.8read 2026-10-23
  • CNACVSS 3.010known since 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • CNAweakness (CWE)CWE-390known since 2026-10-23
  • NVDweakness (CWE)CWE-755, CWE-787read 2026-10-23
  • FIRST EPSSEPSS score3.0 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-11-19
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-3x4w-8mh5-3xjq

Frequently asked questions

What is CVE-2021-40391?

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.

Is CVE-2021-40391 actively exploited?

Active exploitation of CVE-2021-40391 has not been confirmed. Its EPSS score was 3.0% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-40391?

CVE-2021-40391 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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