CVE-2023-39143Public exploitNetwork attack vector

Unauthenticated code execution via chained path traversal

Published Aug 4, 2023 · Updated May 5, 2025

Path traversal in PaperCut NG and MF before 22.1.3 on Windows allows remote attackers to read, delete, or upload arbitrary files. The authenticated API fails to confine two chained path operations to the Application Server's intended directories, despite requiring no prior privileges. Direct server IP access is required; arbitrary upload leads to code execution when external device integration is enabled.

CVSS severity9.8
Critical
EPSS probability80.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in PaperCut NG and MF before 22.1.3 on Windows allows remote attackers to read, delete, or upload arbitrary files. The authenticated API fails to confine two chained path operations to the Application Server's intended directories, despite requiring no prior privileges. Direct server IP access is required; arbitrary upload leads to code execution when external device integration is enabled.

The record

CVE
CVE-2023-39143
Published
Aug 4, 2023
Updated
May 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-22, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 4, 2023CVE publishedPublication date reported by the CVE source.
  2. May 5, 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 vectornetwork
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

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

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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