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CVE Record

CVE-2020-21818: A heap based buffer overflow vulnerability exists in GNU LibreDWG 0.10.2641 via htmlescape ../../programs/e...

A heap based buffer overflow vulnerability exists in GNU LibreDWG 0.10.2641 via htmlescape ../../programs/escape.c:48.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2020-21818 is a reported heap-based buffer overflow in GNU LibreDWG 0.10.2641 in htmlescape at programs/escape.c:48. Exposure is most relevant where this version processes untrusted DWG-related input. The bundle does not provide CVSS, confirmed impact, active exploitation, or a named fix.

Executive priority

Prioritize discovery over emergency response. Escalate if LibreDWG 0.10.2641 processes external customer, supplier, or internet-sourced files, because memory corruption in parsers can become high-impact even when current exploit evidence is incomplete.

Technical view

The record describes a heap buffer overflow in LibreDWG 0.10.2641, tied to htmlescape in programs/escape.c line 48. The source bundle does not include CWE mapping, CVSS scoring, CPEs, proof of exploitability, or remediation details. Treat impact and reachability as unconfirmed until validated against local usage and vendor guidance.

Likely exposure

Organizations are likely exposed only if GNU LibreDWG 0.10.2641 is installed or embedded and parses untrusted DWG-related content. The CVE metadata lists no formal CPEs or affected product inventory.

Exploitation context

The bundle cites a public GitHub issue comment, but KEV is false and no cited source states active exploitation. Public awareness exists, but exploit activity and practical exploitability are not established here.

Researcher notes

The record is sparse: no CVSS, CWE, CPE, patch version, or exploit status is provided. Analysis should focus on reproducing reachability in legitimate test environments, identifying downstream packages, and tracking upstream LibreDWG issue history before assigning operational severity.

Mitigation direction

  • Inventory systems and applications using GNU LibreDWG 0.10.2641.
  • Avoid processing untrusted DWG-related files with affected builds.
  • Check LibreDWG project guidance for fixed versions or recommended workarounds.
  • Apply vendor-supported updates when confirmed available.
  • Constrain file-processing services with sandboxing and least privilege.

Validation and detection

  • Search software inventories for GNU LibreDWG 0.10.2641.
  • Identify applications that bundle or dynamically link LibreDWG.
  • Review file-ingestion workflows for untrusted DWG-related input.
  • Check the cited LibreDWG issue for maintainer remediation notes.
  • Confirm any update by verifying the deployed LibreDWG version.
Prepared
Confidence
low
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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CVE-2020-21818 mapping review

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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
Weakness

CWE details

No CWE listed

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