Security readout for executives and security teams
Plain-English summary
CVE-2020-21831 is a heap-based buffer overflow reported in GNU LibreDWG 0.10. The risk matters where DWG files from untrusted sources are parsed or converted. Public metadata does not provide a CVSS score, confirmed exploitation, or a vendor-named fixed version.
Executive priority
Prioritize review if the organization processes external DWG files or exposes file conversion services. If LibreDWG is not used, business urgency is low. The uncertainty around fixes makes asset validation the immediate task.
Technical view
The CVE describes a heap buffer overflow in GNU LibreDWG 0.10 within read_2004_section_handles in src/decode.c around line 2637. The available record is sparse and references a GitHub issue comment. No CWE, CVSS vector, patch version, or exploit-in-the-wild evidence is provided in the source bundle.
Likely exposure
Exposure is most likely in applications, services, or scripts using GNU LibreDWG 0.10 to parse DWG files, especially uploads, conversion pipelines, or batch processing of external files.
Exploitation context
CISA KEV is false in the provided data, and no cited source states active exploitation. A realistic concern is processing a malicious or malformed DWG file with the vulnerable parser, but public evidence here is incomplete.
Researcher notes
The record lacks CVSS, CWE, detailed affected CPEs, and fixed-version data. Treat GNU LibreDWG 0.10 as the only source-supported affected version. Do not assume broader product impact without upstream confirmation.
Mitigation direction
- Identify any deployed or bundled GNU LibreDWG 0.10 instances.
- Avoid processing untrusted DWG files until vendor guidance is confirmed.
- Check LibreDWG upstream issue tracker and release notes for fixes or workarounds.
- Run DWG parsing in isolated, least-privileged environments where feasible.
Validation and detection
- Inventory packages and embedded libraries for GNU LibreDWG 0.10.
- Map services that parse DWG files from users or third parties.
- Review LibreDWG issue 188 and related upstream commits or releases.
- Confirm whether current versions still contain the referenced decode.c code path.
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-2020-21831 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.
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-574493267CVE 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.