CVE-2021-45342Public exploit

Code execution via unchecked JWW size field

Published Jan 25, 2022 · Updated Aug 4, 2024

Buffer overflow in LibreCAD 2.2.0-rc3 and earlier allows context-dependent attackers to execute code via a crafted JWW document. CDataList::Serialize in jwwlib trusts a document-supplied length and reads that many bytes into a fixed 512-byte stack buffer without bounds checking. A user must open the malicious file; successful exploitation runs code with that user's privileges, while the published proof of concept demonstrates a crash and return-address control.

CVSS severity7.8
High
EPSS probability1.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in LibreCAD 2.2.0-rc3 and earlier allows context-dependent attackers to execute code via a crafted JWW document. CDataList::Serialize in jwwlib trusts a document-supplied length and reads that many bytes into a fixed 512-byte stack buffer without bounds checking. A user must open the malicious file; successful exploitation runs code with that user's privileges, while the published proof of concept demonstrates a crash and return-address control.

The record

CVE
CVE-2021-45342
Published
Jan 25, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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

7.8NISTCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NISTAV: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 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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1204.002Malicious File
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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