Security readout for executives and security teams
Plain-English summary
LibreDWG, a library for handling DWG files, has a reported double-free bug through version v0.10.1.3751. The public CVE record does not provide CVSS, confirmed impact, or a named fix. The main business concern is systems that process untrusted DWG files may crash or behave unpredictably.
Executive priority
Treat as a targeted dependency risk, not an emergency from the available evidence. Prioritize review where DWG files enter from outside the organization or where parsing failures could disrupt customer-facing services.
Technical view
CVE-2021-39528 describes a double free in dwg_free_MATERIAL_private() in dwg.spec in libredwg through v0.10.1.3751. The source bundle does not identify a CWE, affected CPEs, patch version, or exploitability details. Treat it as memory-safety risk in DWG material cleanup paths.
Likely exposure
Exposure is likely limited to applications, services, build tools, or desktop workflows that use LibreDWG and process DWG files, especially files received from external parties. The bundle does not name downstream products or deployment patterns.
Exploitation context
The bundle does not show active exploitation, public weaponization, or KEV listing. It only cites the LibreDWG issue and CVE metadata. Double-free issues can sometimes affect availability or memory integrity, but exploitability is not established here.
Researcher notes
Public data is sparse: no CVSS, CWE, CPE, patch version, or exploit status is provided in the bundle. The strongest technical detail is the named double free in dwg_free_MATERIAL_private() affecting libredwg through v0.10.1.3751.
Mitigation direction
- Identify LibreDWG usage and versions across servers, workstations, containers, and build dependencies.
- Avoid processing untrusted DWG files with affected LibreDWG versions where practical.
- Check the LibreDWG issue and release notes for vendor-confirmed fixes or guidance.
- Add isolation or sandboxing around DWG parsing workflows that handle external files.
Validation and detection
- Confirm whether LibreDWG is present and whether versions are through v0.10.1.3751.
- Map business workflows that parse DWG files from customers, suppliers, or public sources.
- Review crash reports or memory-safety alerts involving DWG material cleanup paths.
- Track the linked LibreDWG issue for fix status and maintainer comments.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2021-39528 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/LibreDWG/libredwg/issues/256CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.