CVE-2020-21813Public exploit

Memory corruption via crafted DWG conversion

Published May 17, 2021 · Updated Jul 9, 2026

Heap-based buffer overflow in GNU LibreDWG 0.10.2641 allows local users to corrupt memory by converting a crafted DWG file with dwg2SVG. The public record identifies output_TEXT at dwg2SVG.c line 114 but does not disclose which operation writes beyond the heap allocation. Execution requires a user to supply and convert malicious DWG input; the record does not establish code execution beyond memory corruption or a crash.

CVSS severity7.8
High
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in GNU LibreDWG 0.10.2641 allows local users to corrupt memory by converting a crafted DWG file with dwg2SVG. The public record identifies output_TEXT at dwg2SVG.c line 114 but does not disclose which operation writes beyond the heap allocation. Execution requires a user to supply and convert malicious DWG input; the record does not establish code execution beyond memory corruption or a crash.

The record

CVE
CVE-2020-21813
Published
May 17, 2021
Updated
Jul 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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