CVE-2023-39143
CriticalExploitedPublic exploitPaperCut NG and PaperCut MF before 22.1.3 on Windows allow path traversal, enabling attackers to upload, read, or delete arbitrary files.
Published Aug 9, 2023 · Updated May 5, 2025
Key Facts
Patch immediately- CVE-2023-39143 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Papercut Mf, Papercut Ng.
- It is exploited in the wild, listed in Industry KEV feed since Oct 17, 2025. Public exploit code is available.
- EPSS estimates a 80% probability of exploitation in the next 30 days.
- Fixed versions are available, including Papercut Mf 22.1.3, Papercut Ng 22.1.3.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
80%
Higher than 99.6% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2023-39143 brief as a PDF
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Description
PaperCut NG and PaperCut MF before 22.1.3 on Windows allow path traversal, enabling attackers to upload, read, or delete arbitrary files. This leads to remote code execution when external device integration is enabled (a very common configuration).
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Oct 17, 2025 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Papercut MfPapercut | See advisory | 22.1.3 |
| Papercut NgPapercut | See advisory | 22.1.3 |
Patched Releases
Papercut Mf
22.1.3
Papercut Ng
22.1.3
Timeline
Publicly disclosed
Aug 9, 2023
Last updated
May 5, 2025
Added to Industry KEV feed
Oct 17, 2025
Weakness Type
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
References
FAQ
Common Questions.
PaperCut NG and PaperCut MF before 22.1.3 on Windows allow path traversal, enabling attackers to upload, read, or delete arbitrary files.
Affected: Papercut Mf; Papercut Ng. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Oct 17, 2025.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Papercut Mf 22.1.3, Papercut Ng 22.1.3.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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