Use After Free in Librecad Libdxfrw
CVE-2021-21900
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.
Vulnerability class: Use-After-Free
EPSS: 0.025 (82.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Librecad Libdxfrw — versions 2.2.0-rc2-19-ge02f3580
- Debian Debian_linux — versions 9.0, 10.0, 11.0
- Fedoraproject Fedora — versions 34, 35
- N/a Librecad — versions LibreCad libdxfrw 2.2.0-rc2-19-ge02f3580
Weakness classification (CWE)
Public proof-of-concept exploits
References
- talos-cna@cisco.com (Exploit, Third Party Advisory, Broken Link)
- talos-cna@cisco.com (vendor-advisory)
- talos-cna@cisco.com (vendor-advisory)
- talos-cna@cisco.com (mailing-list, Mailing List, Third Party Advisory)
- talos-cna@cisco.com (vendor-advisory, Third Party Advisory)
- talos-cna@cisco.com (vendor-advisory)
Frequently asked questions
- What is CVE-2021-21900?
- CVE-2021-21900 is a high-severity vulnerability in Librecad Libdxfrw, classified under Use After Free. CVSS score: 8.8/10. Published 2021-11-19.
- How severe is CVE-2021-21900?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2021-21900 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.