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CVE Record

CVE-2020-21834: A null pointer deference issue exists in GNU LibreDWG 0.10 via get_bmp ../../programs/dwgbmp.c:164.

A null pointer deference issue exists in GNU LibreDWG 0.10 via get_bmp ../../programs/dwgbmp.c:164.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-21834 is a crash-type flaw in GNU LibreDWG 0.10. A malformed input handled by the bitmap extraction path could trigger a null pointer dereference. The main business risk is service interruption in workflows that process DWG files, not confirmed data theft or code execution based on the provided sources.

Executive priority

Prioritize if LibreDWG 0.10 processes external DWG files in business workflows. Otherwise, handle through normal vulnerability management. The available evidence supports denial-of-service concern, not a confirmed breach-enabling vulnerability.

Technical view

The CVE describes a null pointer dereference in GNU LibreDWG 0.10, specifically get_bmp in programs/dwgbmp.c at line 164. No CVSS score or CWE is provided in the source bundle. The evidence points to potential denial of service when vulnerable code processes crafted DWG-related input.

Likely exposure

Exposure is most likely on systems running GNU LibreDWG 0.10 or using the dwgbmp functionality to process DWG files. Risk increases if files come from external users, partners, or automated ingestion pipelines. The source data does not provide complete affected-package metadata.

Exploitation context

The CVE is not listed as KEV in the provided data, and no cited source states active exploitation. The public reference is a GitHub issue comment. Practical impact appears limited to application crash or workflow disruption unless other evidence emerges.

Researcher notes

Evidence is sparse: the CVE description and GitHub reference identify a null pointer dereference location but provide no CVSS, CWE, patch status, or exploitation evidence. Avoid assuming broader LibreDWG versions are affected without vendor confirmation.

Mitigation direction

  • Inventory systems and applications using GNU LibreDWG 0.10.
  • Review GNU LibreDWG guidance, release notes, and issue tracker for a fix.
  • Update away from version 0.10 if a vendor-supported fixed version is identified.
  • Restrict processing of untrusted DWG files until remediation is confirmed.
  • Run file conversion or parsing jobs with least privilege and isolation.

Validation and detection

  • Confirm installed LibreDWG versions across servers, desktops, and containers.
  • Identify workflows invoking dwgbmp or LibreDWG bitmap extraction.
  • Check whether DWG inputs originate from untrusted sources.
  • Verify remediation against vendor release notes or package changelogs.
  • Monitor processing jobs for crashes tied to DWG handling.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
3Timeline events
1ADP providers
2Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

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ADP provider summaries

CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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