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CVE Record

CVE-2020-21830: A heap based buffer overflow vulneraibility exists in GNU LibreDWG 0.10 via bit_calc_CRC ../../src/bits.c:2...

A heap based buffer overflow vulneraibility exists in GNU LibreDWG 0.10 via bit_calc_CRC ../../src/bits.c:2213.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-21830 is a reported heap-based buffer overflow in GNU LibreDWG 0.10. It occurs in CRC calculation code when handling DWG-related data. Business risk depends on where LibreDWG is used, especially systems that process externally supplied CAD files. No active exploitation is reported in the provided sources.

Executive priority

Prioritize if LibreDWG is used in internet-facing, automated, or customer-file processing workflows. If usage is limited to trusted internal files, urgency is lower but remediation tracking is still appropriate because the vulnerability is memory-corruption related.

Technical view

The CVE record describes a heap-based buffer overflow in GNU LibreDWG 0.10, specifically bit_calc_CRC in src/bits.c around line 2213. The public data does not provide CVSS, CWE mapping, exploitability details, or a named fixed version. Impact is not fully documented, but heap corruption in file-parsing code can cause process crashes or worse depending on context.

Likely exposure

Organizations may be exposed if they run GNU LibreDWG 0.10 directly or through applications that embed it to parse DWG files. Highest concern is automated processing of untrusted or user-uploaded CAD files. The source bundle does not identify affected downstream products.

Exploitation context

The public reference is a GitHub issue comment tied to LibreDWG. The provided sources do not show CISA KEV listing, public exploitation in the wild, exploit code, or confirmed remote code execution. Treat exploitation status as unconfirmed.

Researcher notes

Evidence is sparse. The CVE names GNU LibreDWG 0.10 and a specific function/location, but does not include CVSS, affected CPEs, root-cause detail, patch reference, or impact confirmation. Further triage should focus on upstream issue history and distro-specific advisories.

Mitigation direction

  • Inventory systems and applications using GNU LibreDWG 0.10.
  • Check LibreDWG project guidance for fixed versions or patches.
  • Avoid processing untrusted DWG files with affected versions where practical.
  • Isolate CAD file conversion or parsing services from critical systems.
  • Monitor vendor and distribution advisories for backported fixes.

Validation and detection

  • Confirm whether LibreDWG 0.10 is installed or embedded.
  • Review package manifests, SBOMs, and linked libraries for LibreDWG.
  • Identify workflows that parse external DWG files.
  • Check whether deployed builds include upstream fixes after the reported issue.
  • Document compensating controls for any remaining affected deployments.
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

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
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CWE details

No CWE listed

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