CVE-2023-27350

Confirmed PUBLISHED

This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication...

PaperCut · NG

Exploited in the wild Used in malware PoC available

Recommended Action

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

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Confidence

Confirmed

Exploitation Status

Exploited in the wild

Observed in Sensors

Attempts (30d)

—

Unique Attacker IPs

—

CISA KEV

In CISA KEV

CVSS / EPSS

9.8 Critical EPSS 100.0%

At a Glance

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.

metasploit malware ransomware cisa nuclei_scanner

CVE Published: Apr 20, 2023
Exploitation Reported: Apr 21, 2023
CVSS: 9.8 Critical
EPSS: 100.0%

Remote Low complexity No user interaction Unauthenticated

Affected Versions

Vendor	Product	Version	Status
PaperCut	NG	22.0.5 (Build 63914)	Affected

CVE References

zerodayinitiative.com/advisories/ZDI-23-233 zerodayinitiative.com · CVE Record https://www.zerodayinitiative.com/advisories/ZDI-23-233/
papercut.com/kb/Main/PO-1216-and-PO-1219 papercut.com · CVE Record https://www.papercut.com/kb/Main/PO-1216-and-PO-1219
packetstormsecurity.com/files/171982/PaperCut-MF-NG-Authentication-B... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/171982/PaperCut-MF-NG-Authentica...
packetstormsecurity.com/files/172022/PaperCut-NG-MG-22.0.4-Authentic... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/172022/PaperCut-NG-MG-22.0.4-Aut...
news.sophos.com/en-us/2023/04/27/increased-exploitation-of-p... news.sophos.com · CVE Record https://news.sophos.com/en-us/2023/04/27/increased-exploitation-of-pa...

Show 2 more references

packetstormsecurity.com/files/172512/PaperCut-NG-MG-22.0.4-Remote-Co... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/172512/PaperCut-NG-MG-22.0.4-Rem...
packetstormsecurity.com/files/172780/PaperCut-PaperCutNG-Authenticat... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/172780/PaperCut-PaperCutNG-Authe...

Recommended Actions

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.

Known Exploited Vulnerability Sources

Catalogues that list this CVE as a known exploited vulnerability.

Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.

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Source	Added
CISA First	2023-04-21 00:00 UTC
The Shadowserver	2026-06-13 00:00 UTC

Scanner Artifacts

Nuclei and Metasploit references linked to this CVE.

Scanner	Reference	Detected
Nuclei	https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-27350.yaml	Apr 25, 2025
Metasploit	https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/papercut_ng_auth_bypass.rb	Apr 28, 2025

CVSS Scores

CVSS v3.1 9.8 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.0 9.8 Critical

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation Status

Exploited in the wild

Recorded 2023-04-21 00:00:00 UTC · CISA

Used in malware

Recorded 2023-04-21 00:00:00 UTC · CISA

Proof of concept available

Recorded 2023-04-21 09:19:13 UTC · GitHub

Weaknesses (CWE)

CWE-284

Improper Access Control

Scanner Integrations

Scanner	Reference	Detected
Metasploit	https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/multi/http/papercut_ng_auth_bypass.rb	Apr 28, 2025
Nuclei	https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-27350.yaml	Apr 25, 2025

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

monke443/CVE-2023-27350

github · Created 2025-03-09 18:08:42 UTC · 3 stars

Unauthenticated remote command execution in Papercut service allows an attacker to execute commands due to improper access controls in the SetupCompleted Java class.

Jenderal92/CVE-2023-27350

github · Created 2023-06-13 22:13:24 UTC · 0 stars

Python 2.7

ThatNotEasy/CVE-2023-27350

github · Created 2023-05-27 11:32:35 UTC · 2 stars

Perfom With Massive Authentication Bypass In PaperCut MF/NG

adhikara13/CVE-2023-27350

github · Created 2023-04-25 20:51:23 UTC · 8 stars

Exploit for Papercut CVE-2023-27350. [+] Reverse shell [+] Mass checking

horizon3ai/CVE-2023-27350

github · Created 2023-04-22 21:34:06 UTC · 51 stars

Proof of Concept Exploit for PaperCut CVE-2023-27350

imancybersecurity/CVE-2023-27350-POC

github · Created 2023-04-21 20:13:47 UTC · 12 stars

MaanVader/CVE-2023-27350-POC

github · Created 2023-04-21 09:19:13 UTC · 5 stars

A simple python script to check if a service is vulnerable

PaperCut - Unauthenticated Remote Code Execution

nuclei · Created Unknown

papercut_ng_auth_bypass

metasploit · Created Unknown

Metasploit module for CVE-2023-27350

Timeline

Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.

13 Jun 2026 00:00 UTC about 1 month ago

13 Jun 2026 00:00 UTC · about 1 month ago

KEV confirmed by The Shadowserver

Exploitation attested by an external source
28 Apr 2025 15:02 UTC about 1 year ago

28 Apr 2025 15:02 UTC · about 1 year ago

Metasploit module available

Exploit module available
25 Apr 2025 00:00 UTC about 1 year ago

25 Apr 2025 00:00 UTC · about 1 year ago

Nuclei template available

Scanner coverage available
21 Apr 2023 09:19 UTC over 3 years ago

21 Apr 2023 09:19 UTC · over 3 years ago

Public PoC available

Public proof-of-concept code published
21 Apr 2023 00:00 UTC over 3 years ago

21 Apr 2023 00:00 UTC · over 3 years ago

Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
21 Apr 2023 00:00 UTC over 3 years ago

21 Apr 2023 00:00 UTC · over 3 years ago

First public exploitation report

Exploit observed in malware
20 Apr 2023 00:00 UTC over 3 years ago

20 Apr 2023 00:00 UTC · over 3 years ago

CVE published

Vulnerability disclosed publicly
28 Feb 2023 00:00 UTC over 3 years ago

28 Feb 2023 00:00 UTC · over 3 years ago

CVE ID reserved

Identifier reserved by the CNA

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Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Pro API Example

GET /api/v2/pro/kevs/CVE-2023-27350

{
  "cve_id": "CVE-2023-27350",
  "title": "This vulnerability allows remote attackers to bypass authentication on affect...",
  "affected_vendor": "PaperCut",
  "affected_product": "NG",
  "affected_versions": [
    { "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
  ],
  "confidence": "Confirmed",
  "cvss_score": 9.8,
  "epss_score": 0.99999,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "...": "Pro API fields" },
  "proof_of_concepts": [ "..." ],
  "scanner_integrations": [ "..." ]
}

The free JSON API returns basic KEV fields only. Confidence, telemetry, and artifact enrichment require Pro API access.

CVE-2023-27350

At a Glance

Affected Versions

CVE References

Recommended Actions

Known Exploited Vulnerability Sources

Scanner Artifacts

Virtual Patch

CVSS Scores

Exploitation Status

Weaknesses (CWE)

Scanner Integrations

Potential Proof of Concepts

Timeline

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