Security readout for executives and security teams
Plain-English summary
CVE-2020-21833 is a reported heap buffer overflow in GNU LibreDWG 0.10, a library for reading DWG files. The public record does not provide CVSS, confirmed impact, or a named fix. Treat it as relevant if your organization processes DWG files, especially from external or untrusted sources.
Executive priority
Prioritize discovery first. If LibreDWG 0.10 handles external DWG files, treat remediation as time-sensitive. If the library is absent or only used with trusted internal files, urgency is lower but still requires tracking.
Technical view
The CVE describes a heap-based buffer overflow in GNU LibreDWG 0.10 within read_2004_section_classes at src/decode.c:2440. The source bundle provides no CWE, CVSS vector, CPEs, or confirmed attack outcome. Exposure is most plausible in applications or workflows that parse DWG content using this library.
Likely exposure
Organizations may be exposed if GNU LibreDWG 0.10 is installed directly or bundled into tools that parse DWG files. Risk is higher where users, customers, or partners can submit DWG files for processing.
Exploitation context
The source bundle shows no CISA KEV listing and provides no cited evidence of active exploitation. A public GitHub issue reference exists, but the provided data does not establish exploit availability or real-world attacks.
Researcher notes
Public evidence is sparse. The CVE record names the vulnerable function and version, but does not provide structured affected CPEs, scoring, impact, or remediation. Avoid assuming code execution or a fixed version without confirming LibreDWG project guidance.
Mitigation direction
- Identify any direct or bundled use of GNU LibreDWG 0.10.
- Check LibreDWG project guidance, issues, and release notes for fixes.
- Avoid processing untrusted DWG files until remediation is confirmed.
- Run DWG parsing in sandboxed or isolated environments.
- Restrict file upload paths that feed LibreDWG-based tooling.
Validation and detection
- Inventory packages and applications that include GNU LibreDWG.
- Confirm whether version 0.10 is present in production or build images.
- Review workflows that parse external DWG files.
- Check crash logs for references to read_2004_section_classes or decode.c.
- Track vendor or project updates linked to the GitHub issue.
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-2020-21833 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
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.
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/LibreDWG/libredwg/issues/188#issuecomment-574493364CVE reference, mitre
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.