Security readout for executives and security teams
Plain-English summary
CVE-2020-21839 is a memory leak in GNU LibreDWG 0.10 triggered by crafted input. The main business risk is service instability or resource exhaustion in systems that parse untrusted DWG files. There is no source evidence of active exploitation or a published CVSS score.
Executive priority
Treat as a targeted availability risk, not an emergency. Prioritize review if DWG parsing is exposed to customers, partners, or automated file intake pipelines.
Technical view
The CVE describes crafted input causing a memory leak in dwg_decode_eed in ../../src/decode.c:3638 in GNU LibreDWG 0.10. This aligns with CWE-401, missing release of memory after effective lifetime. Available sources do not name a fixed version or detailed remediation.
Likely exposure
Exposure is likely limited to applications, services, or workflows using GNU LibreDWG 0.10 to process DWG files, especially user-supplied or externally sourced files.
Exploitation context
Sources support a crafted-input memory leak condition. They do not support active exploitation, public weaponization, or broad internet-facing exposure. The plausible impact is denial of service through resource consumption during file parsing.
Researcher notes
Evidence is sparse: the CVE record and GitHub issue identify the function and memory leak, but no CVSS, CWE assignment in the CVE, exploit status, or fixed version is provided. Avoid assuming impact beyond resource exhaustion.
Mitigation direction
- Inventory systems and products using GNU LibreDWG 0.10.
- Check LibreDWG project guidance for fixed releases or patches.
- Avoid processing untrusted DWG files where possible.
- Run DWG parsing in resource-limited, isolated environments.
- Monitor parsing services for abnormal memory growth.
Validation and detection
- Confirm whether GNU LibreDWG 0.10 is installed or bundled.
- Identify services that parse DWG files from external users.
- Review dependency manifests and vendor SBOMs for LibreDWG.
- Check operational logs for memory exhaustion during DWG processing.
- Verify whether vendor or upstream fixes have been applied.
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-2020-21839 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-574492707CVE reference, mitre
- https://cwe.mitre.org/data/definitions/401.htmlCVE 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.