CVE-2021-21899

Name: CVE-2021-21899
Creator: NVD / NIST
Published: 2021-11-19T19:15:08.08+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.69%

Last modified Jun 17, 2026

CVE-2021-21899 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A code execution vulnerability exists in the dwgCompressor::copyCompBytes21 functionality of LibreCad libdxfrw 2.2.0-rc2-19-ge02f3580. A specially-crafted .dwg file can lead to a heap buffer overflow. EPSS estimates a 2.69% chance of exploitation in the next 30 days.

Description

A code execution vulnerability exists in the dwgCompressor::copyCompBytes21 functionality of LibreCad libdxfrw 2.2.0-rc2-19-ge02f3580. A specially-crafted .dwg file can lead to a heap buffer overflow. An attacker can provide a malicious file to trigger this vulnerability.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

2.69%

83.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Librecad	Libdxfrw	2.2.0-rc2-19-ge02f3580
Fedoraproject	Fedora	34
Fedoraproject	Fedora	35
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0

References

https://lists.debian.org/debian-lts-announce/2021/12/msg00002.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RDI3HCTCACMIC7I4ILB3NRU6DCMADI5H/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZTIAMP7QJDKV4ADDLR4GVVX2TXYLHVOZ/
https://security.gentoo.org/glsa/202305-26
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1350Exploit, Third Party Advisory
https://www.debian.org/security/2022/dsa-5077Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/12/msg00002.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RDI3HCTCACMIC7I4ILB3NRU6DCMADI5H/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZTIAMP7QJDKV4ADDLR4GVVX2TXYLHVOZ/
https://security.gentoo.org/glsa/202305-26
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1350Exploit, Third Party Advisory
https://www.debian.org/security/2022/dsa-5077Third Party Advisory

Timeline

Published: Nov 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21899?

How severe is CVE-2021-21899?

CVE-2021-21899 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.69% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21899?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21899?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST