CVE-2023-27350
PaperCut MF/NG Improper Access Control Vulnerability
- Critical 9.8
- Exploited: added to CISA KEV 21 Apr 2023
- Used in ransomware campaigns
Description
This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication is not required to exploit this vulnerability. The specific flaw exists within the SetupCompleted class. The issue results from improper access control. An attacker can leverage this vulnerability to bypass authentication and execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-18987.
Key facts
- Published
- 20 Apr 2023
- Last changed
- 21 Oct 2025
- Assigned by
- zdi
- KEV added
- 21 Apr 2023
- KEV fix due
- 12 May 2023
- Used in ransomware
- Yes, according to CISA
- EPSS
- 99.999% likely to be exploited in the next 30 days, higher than 99.994% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: yes; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 9.8CVSS 3.0, Criticalfrom the CNA (zdi)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| PaperCut | NG |
|
Timeline
- 20 Apr 2023 Published
- 21 Apr 2023 CVE-2023-27350 added to CISA KEV
- 21 Apr 2023 Added to the CISA KEV catalogue