CVE-2023-29596Public exploit

Code execution via overlapping memcpy in FrenchStemmer

Published Apr 26, 2023 · Updated Feb 3, 2025

Buffer overflow in ByronKnoll Cmix 19 allows attackers to execute arbitrary code or crash the program through a crafted input file. FrenchStemmer::ConvertUTF8 in paq8.cpp passes overlapping regions within a Word buffer to memcpy while processing the file. Exploitation requires a user to process the crafted file with the -n option; the public report demonstrates an AddressSanitizer termination, while code execution is asserted only by the CVE record.

CVSS severity7.8
High
EPSS probability0.33%
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 ByronKnoll Cmix 19 allows attackers to execute arbitrary code or crash the program through a crafted input file. FrenchStemmer::ConvertUTF8 in paq8.cpp passes overlapping regions within a Word buffer to memcpy while processing the file. Exploitation requires a user to process the crafted file with the -n option; the public report demonstrates an AddressSanitizer termination, while code execution is asserted only by the CVE record.

The record

CVE
CVE-2023-29596
Published
Apr 26, 2023
Updated
Feb 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 3, 2025Record 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

7.8NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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