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Fencer Vulns
high 8.8

CVE-2021-21900 json

A code execution vulnerability exists in the dxfRW::processLType() functionality of LibreCad libdxfrw 2.2.0-rc2-19-ge02f3580.

published 2021-11-19 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-9071

cvss
8.8
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.5%
EPSS 2.5% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

A code execution vulnerability exists in the dxfRW::processLType() functionality of LibreCad libdxfrw 2.2.0-rc2-19-ge02f3580. A specially-crafted .dxf file can lead to a use-after-free vulnerability. An attacker can provide a malicious file to trigger this vulnerability.

Patch / fix

  • librecad Debian 14, Debian 13, Debian 12 2.1.3-2

debian advisories DEBIAN-CVE-2021-21900

  • librecad Ubuntu 18.04 LTS 2.1.2-1ubuntu0.1
  • librecad Ubuntu 20.04 LTS 2.1.3-1.2+deb10u1build0.20.04.1
  • librecad Ubuntu Pro 16.04 LTS 2.0.9-2ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-21900

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

  • librecad Package Hub 15 SP3, openSUSE Leap 15.3 2.2.0~rc3-bp153.2.3.1
  • libdxfrw Package Hub 15 SP3, openSUSE Leap 15.3 1.0.1+git.20220109-bp153.2.3.1

opensuse advisories openSUSE-SU-2022:0067-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-21900 updated cvss 8.8

librecad: use-after-free in dxfRW:processLType()

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.54% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • talosintelligence.com https://talosintelligence.com/vulnerability_reports/TALOS-2021-1351 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • n/a LibreCAD

Classification

Weakness

References

Sources

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.