# CVE-2021-21899: librecad: A code execution vulnerability exists in the dwgCompressor::copyCompBytes21 functionality of LibreCad libdxfrw 2.2.0-...

CVE-2021-21899 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2021-21899, released November 19, 2021. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-21899
- Priority: High
- CVSS: 8.8 (high)
- EPSS: 0.0276
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 19, 2021

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | librecad Debian 12.15 (bookworm) | 2.1.3-2 | [DEBIAN-CVE-2021-21899](https://patchblox.com/security/data/fix/linux/debian-cve-2021-21899.md) | Nov 19, 2021 |
| Linux | librecad Debian 13.5 (trixie) | 2.1.3-2 | [DEBIAN-CVE-2021-21899](https://patchblox.com/security/data/fix/linux/debian-cve-2021-21899.md) | Nov 19, 2021 |
| Linux | librecad Debian 14 | 2.1.3-2 | [DEBIAN-CVE-2021-21899](https://patchblox.com/security/data/fix/linux/debian-cve-2021-21899.md) | Nov 19, 2021 |
| Linux | librecad Ubuntu 18.04.6 LTS (bionic) | 2.1.2-1ubuntu0.1~esm1 | [librecad 2.1.2-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-librecad-2.1.2-1ubuntu0.1-esm1.md) | Jan 25, 2022 |
| Linux | librecad Ubuntu 20.04 LTS (focal) | 2.1.3-1.2+deb10u1build0.20.04.1 | [librecad 2.1.3-1.2+deb10u1build0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-librecad-2.1.3-1.2-deb10u1build0.20.04.1.md) | Jan 25, 2022 |
| Linux | librecad-data Ubuntu 18.04.6 LTS (bionic) | 2.1.2-1ubuntu0.1~esm1 | [librecad-data 2.1.2-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-librecad-data-2.1.2-1ubuntu0.1-esm1.md) | Jan 25, 2022 |
| Linux | librecad-data Ubuntu 20.04 LTS (focal) | 2.1.3-1.2+deb10u1build0.20.04.1 | [librecad-data 2.1.3-1.2+deb10u1build0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-librecad-data-2.1.3-1.2-deb10u1build0.20.04.1.md) | Jan 25, 2022 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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