CVE-2023-27350

critical

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.

References

https://www.zerodayinitiative.com/advisories/ZDI-23-233/

https://news.sophos.com/en-us/2023/04/27/increased-exploitation-of-papercut-drawing-blood-around-the-internet/

http://packetstormsecurity.com/files/171982/PaperCut-MF-NG-Authentication-Bypass-Remote-Code-Execution.html

https://www.bleepingcomputer.com/news/security/recently-patched-papercut-zero-days-used-in-data-theft-attacks/

https://www.databreachtoday.com/attackers-actively-exploit-flaws-in-papercut-ngmf-a-32696

https://www.bleepingcomputer.com/news/security/papercut-releases-second-emergency-patch-for-exploited-flaws/

https://thehackernews.com/2026/08/papercut-zero-day-exploited-in-attacks.html

https://securityaffairs.com/197980/uncategorized/papercut-zero-day-under-active-attack-emergency-patch-released.html

https://www.helpnetsecurity.com/2026/08/27/papercut-ng-mf-vulnerability-attack/

https://www.bleepingcomputer.com/news/security/papercut-warns-of-ng-mf-flaw-exploited-in-zero-day-attacks/

https://securityaffairs.com/197119/malware/storm-1175-replaces-medusa-with-new-stormencryptor-ransomware.html

https://thehackernews.com/2026/04/china-linked-storm-1175-exploits-zero.html

https://securityaffairs.com/190440/cyber-crime/fast-moving-storm-1175-uses-new-exploits-to-breach-networks-and-drop-medusa.html

https://www.bleepingcomputer.com/news/security/microsoft-links-medusa-ransomware-affiliate-to-zero-day-attacks/

https://www.bleepingcomputer.com/news/security/cisa-flags-papercut-rce-bug-as-exploited-in-attacks-patch-now/

https://thehackernews.com/2025/05/mimo-hackers-exploit-cve-2025-32432-in.html

https://www.cisa.gov/news-events/cybersecurity-advisories/aa24-317a

https://securelist.com/vulnerability-report-q1-2024/112554/

https://thehackernews.com/2023/12/behind-scenes-of-matveevs-ransomware.html

https://www.cisa.gov/news-events/cybersecurity-advisories/aa23-131a

https://www.tenable.com/blog/frequently-asked-questions-about-iranian-cyber-operations

https://github.com/HORKimhab/CVE-2023-27350-CVE-2023-27351

https://github.com/chengbochuan3/CVE-Enterprise-Software

https://github.com/danielissaq/-PaperCut-CVE-2023-27350-

https://github.com/joaoaugustom/PaperCut-Authentication_Bypass_and_RCE

https://github.com/THU-HJY/CVE-Honeypot

https://github.com/hermestoola/bb-hunter-pro

https://github.com/dezso-dfield/CVE-2023-27350

https://github.com/leejeeho6661/cve

https://github.com/monke443/CVE-2023-27350

https://github.com/leyamir/CVE_learning

https://github.com/getdrive/PaperCut

https://github.com/Loginsoft-Research/Linux-Exploit-Detection

https://www.papercut.com/kb/Main/PO-1216-and-PO-1219

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27350

http://packetstormsecurity.com/files/172780/PaperCut-PaperCutNG-Authentication-Bypass.html

http://packetstormsecurity.com/files/172512/PaperCut-NG-MG-22.0.4-Remote-Code-Execution.html

http://packetstormsecurity.com/files/172022/PaperCut-NG-MG-22.0.4-Authentication-Bypass.html

Details

Source: Mitre, NVD

Published: 2023-04-20

Updated: 2026-06-17

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

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

Severity: Critical

EPSS

EPSS: 0.99999