CVE-2022-33026Public exploit

Crash via one-byte CRC buffer over-read

Published Jun 22, 2022 · Updated Aug 3, 2024

Heap buffer over-read in GNU LibreDWG 0.12.4.4608 allows local users to crash dwg2dxf by opening a crafted pre-R13 DWG file. The bit_calc_CRC loop reads one byte beyond the heap buffer allocated for the input while decode_preR13 calculates its CRC. Triggering requires dwg2dxf to process the crafted file; the upstream project labels the report invalid and not reproducible in the latest release.

CVSS severity7.8
High
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer over-read in GNU LibreDWG 0.12.4.4608 allows local users to crash dwg2dxf by opening a crafted pre-R13 DWG file. The bit_calc_CRC loop reads one byte beyond the heap buffer allocated for the input while decode_preR13 calculates its CRC. Triggering requires dwg2dxf to process the crafted file; the upstream project labels the report invalid and not reproducible in the latest release.

The record

CVE
CVE-2022-33026
Published
Jun 22, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2022CVE 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

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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
T1204.002User Execution: Malicious File

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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