Security readout for executives and security teams
Plain-English summary
CVE-2020-21842 is a reported heap-based buffer overflow in GNU LibreDWG 0.10. The risk is most relevant where systems process DWG files, especially files from untrusted sources. Public data provided does not include a CVSS score, confirmed exploitation, or a named vendor fix.
Executive priority
Treat as a targeted remediation item for teams handling CAD/DWG files. Prioritize if LibreDWG 0.10 processes external files or supports customer-upload workflows. No public exploitation signal is provided.
Technical view
The CVE describes a heap-based buffer overflow in GNU LibreDWG 0.10, specifically in read_2004_section_revhistory in src/decode.c around line 3051. The record does not list CWE, CVSS, CPEs, or detailed affected-version ranges beyond LibreDWG 0.10.
Likely exposure
Organizations may be exposed if LibreDWG 0.10 is installed directly or bundled into applications that parse DWG files. Exposure depends on whether untrusted DWG content is processed.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The likely attack condition is parsing a crafted DWG file, but public evidence here is insufficient to claim exploitability beyond the reported overflow.
Researcher notes
Evidence is sparse: the CVE record cites a GitHub issue comment and identifies the vulnerable function, but lacks CVSS, CWE, and complete affected-product metadata. Avoid assuming remote code execution without additional vendor or researcher confirmation.
Mitigation direction
- Inventory systems and applications using GNU LibreDWG 0.10.
- Check LibreDWG project guidance, issue history, and release notes for fixes.
- Avoid processing untrusted DWG files with affected tooling.
- Run DWG parsing workflows with least privilege and isolation.
Validation and detection
- Search SBOMs and package inventories for LibreDWG 0.10.
- Confirm whether applications statically or dynamically bundle LibreDWG.
- Review DWG ingestion points for untrusted file exposure.
- Check crash logs from DWG processing services for related failures.
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-2020-21842 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-574493684CVE 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.