CVE-2021-28237Public exploit

Process memory corruption via decode_preR13

Published Dec 2, 2021 · Updated Aug 3, 2024

Heap-buffer overflow in LibreDWG 0.12.3 allows attackers to crash or corrupt processes via a crafted DWG file. The decode_preR13 parser writes beyond a heap allocation while decoding malformed pre-R13 sections, as demonstrated by an AddressSanitizer report. Exploitation requires getting the crafted file processed by LibreDWG; the published evidence does not establish remote service exposure or code execution.

CVSS severity7.5
High
EPSS probability1.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-buffer overflow in LibreDWG 0.12.3 allows attackers to crash or corrupt processes via a crafted DWG file. The decode_preR13 parser writes beyond a heap allocation while decoding malformed pre-R13 sections, as demonstrated by an AddressSanitizer report. Exploitation requires getting the crafted file processed by LibreDWG; the published evidence does not establish remote service exposure or code execution.

The record

CVE
CVE-2021-28237
Published
Dec 2, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NVDAV:N/AC:L/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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