CVE-2023-41633

Process crash via xls2csv NULL dereference

Published Sep 1, 2023 · Updated Oct 1, 2024

NULL pointer dereference in Catdoc 0.95 xls2csv allows local users to crash the process by supplying a crafted Excel file. The public record locates the dereference in src/fileutil.c but does not identify the affected function, the null-valued pointer, or the malformed field that produces it. Exploitation requires a user or local workflow to open the crafted file with xls2csv, and the demonstrated consequence is limited to termination of that CLI process.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Catdoc 0.95 xls2csv allows local users to crash the process by supplying a crafted Excel file. The public record locates the dereference in src/fileutil.c but does not identify the affected function, the null-valued pointer, or the malformed field that produces it. Exploitation requires a user or local workflow to open the crafted file with xls2csv, and the demonstrated consequence is limited to termination of that CLI process.

The record

CVE
CVE-2023-41633
Published
Sep 1, 2023
Updated
Oct 1, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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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