CVE-2023-27350 (GCVE-0-2023-27350)

Vulnerability from cvelistv5 – Published: 2023-04-20 00:00 – Updated: 2025-10-21 23:05
VLAI CISA Shadowserver KEVIntel
Summary
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.
Severity
9.8 (Critical)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-284 - Improper Access Control
Assigner
zdi
References
Impacted products
Vendor Product Version
PaperCut NG Affected: 22.0.5 (Build 63914)
Create a notification for this product.
Credits
Anonymous
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 6a42255d-ab36-4a3c-ba02-d798c1278e9e

Vulnerability ID: CVE-2023-27350

Status: Confirmed

Status Updated: 2023-04-21 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2023-04-21
Asserted: 2023-04-21
Scope
Notes: KEV entry: PaperCut MF/NG Improper Access Control Vulnerability | Affected: PaperCut / MF/NG | Description: PaperCut MF/NG contains an improper access control vulnerability within the SetupCompleted class that allows authentication bypass and code execution in the context of system. | Required action: Apply updates per vendor instructions. | Due date: 2023-05-12 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://www.papercut.com/kb/Main/PO-1216-and-PO-1219; https://nvd.nist.gov/vuln/detail/CVE-2023-27350
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-284
Feed CISA Known Exploited Vulnerabilities Catalog
Product MF/NG
Due Date 2023-05-12
Date Added 2023-04-21
Vendorproject PaperCut
Vulnerabilityname PaperCut MF/NG Improper Access Control Vulnerability
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 12:27 UTC | Updated: 2026-02-06 07:17 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 0e3b17a2-1e84-4842-a746-eb42a3cefdb7

Vulnerability ID: CVE-2023-27350

Status: Confirmed

Status Updated: 2026-07-04 00:00 UTC

Exploited: Yes

Characteristics
Severity: 98.0
Timestamps
First Seen: 2023-10-14
Asserted: 2023-10-14
Last Seen: 2026-07-04
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: PaperCut / PaperCut MF/NG | Class: device-management-platform | Severity: Critical (CVSS 9.8) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-07-04: 6
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class device-management-platform
7D Avg 0
Vendor PaperCut
30D Avg 5
90D Avg 3
Product PaperCut MF/NG
Cisa Kev yes
Connections 6
Observation Date 2026-07-04
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity Critical
References
Created: 2026-06-30 09:23 UTC | Updated: 2026-07-06 01:01 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 88c4cb7a-97b9-44fc-8074-39ddc6804bdd

Vulnerability ID: CVE-2023-27350

Status: Confirmed

Status Updated: 2023-04-21 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2023-04-21
Asserted: 2023-04-21
Scope
Notes: KEVIntel entry: This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication... | Affected: PaperCut / NG | CVSS: 9.8 (CRITICAL) | EPSS: 0.99999 | Used in malware: yes | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Confirmed Compromise

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication...
Vendor PaperCut
Product NG
Added Date 2023-04-21T00:00:00.000Z
Cvss Score 9.8
Epss Score 0.99999
Cvss Severity CRITICAL
Epss Percentile 0.99991
Used In Malware yes
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:05 UTC | Updated: 2026-06-23 14:05 UTC
Show details on NVD website
To clipboard 

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      "dataType": "CVE_RECORD",
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    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.