Security readout for executives and security teams
Plain-English summary
CVE-2019-20911 is a denial-of-service flaw in GNU LibreDWG through 0.9.3. A specially crafted input file can make the library fail while calculating a CRC. Business urgency depends on whether your systems process untrusted DWG files or expose file conversion services.
Executive priority
Prioritize remediation where LibreDWG processes externally supplied DWG files or supports customer-facing conversion workflows. Lower urgency applies to isolated internal-only use with trusted files.
Technical view
The CVE describes crafted input causing denial of service in bit_calc_CRC in bits.c, related to a for loop. Public metadata does not provide CVSS, CWE, exploit maturity, or a named fixed release. A referenced upstream commit appears relevant but should be validated against vendor guidance.
Likely exposure
Exposure is most likely in applications, converters, automation jobs, or services that use GNU LibreDWG through 0.9.3 to parse DWG content, especially content from external users.
Exploitation context
The source bundle does not show KEV listing or active exploitation. The known impact is denial of service from crafted input, not code execution or data theft based on available evidence.
Researcher notes
Evidence is sparse: the CVE states affected versions through 0.9.3 and a DoS in bit_calc_CRC. No CVSS, CWE, fixed release, or exploitation evidence is included in the provided bundle.
Mitigation direction
- Inventory systems and applications using GNU LibreDWG through 0.9.3.
- Check upstream LibreDWG guidance and release notes for the supported fix path.
- Review the referenced upstream commit before backporting or applying source-level changes.
- Restrict processing of untrusted DWG files where LibreDWG cannot be promptly updated.
- Add resource isolation around DWG parsing services that handle external files.
Validation and detection
- Confirm installed LibreDWG versions across build, runtime, and container images.
- Identify services or jobs that process DWG files from users or third parties.
- Verify whether the referenced fix commit is present in deployed source builds.
- Review crash or availability logs for DWG parsing failures.
- Confirm compensating controls limit impact from parser hangs or crashes.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2019-20911 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/178CVE reference · x_refsource_MISC
- https://github.com/LibreDWG/libredwg/commit/c6f6668b82bfe595899cc820279ac37bb9ef16f5CVE 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.