CVE-2023-27350

Exp

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.

Published: 2023-04-20 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-27350 is rated Critical Active Threat (100/100): CVSS Critical severity, with high exploitation likelihood (EPSS 100.00%, 100th percentile). CISA KEV confirms active exploitation (added 2023-04-21) affecting PaperCut / MF/NG. a weakness (CWE-284) Unauthenticated remote administrative access may be possible. EPSS rose +5.74% over the last day, indicating growing attacker interest. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2023-27350

Name: PaperCut MF/NG Improper Access Control Vulnerability · CISA KEV detail

Exploit added: 2023-04-21

Action due: 2023-05-12

Required action: Apply updates per vendor instructions.

Public exploit references (Exploit-DB) for CVE-2023-27350

EDB-ID Source Kind Published Link
51452 exploit_db edb 2023-05-23 Exploit-DB ↗
51391 exploit_db edb 2023-04-25 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2023-27350

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 94.26% 100.00% +5.74%
2 2025-12-28 94.22% 94.26% +0.04%
3 2025-12-27 — 94.22% —

Full EPSS history (34 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-27350

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2023-27350

Affected software / configurations for CVE-2023-27350

Vendor Product Version Raw CPE
papercut papercut_mf >= 8.0, < 20.1.7 cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*
papercut papercut_mf >= 21.0.0, < 21.2.11 cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*
papercut papercut_mf >= 22.0.0, < 22.0.9 cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*
papercut papercut_ng >= 8.0, < 20.1.7 cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*
papercut papercut_ng >= 21.0.0, < 21.2.11 cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*
papercut papercut_ng >= 22.0.0, < 22.0.9 cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*

References for CVE-2023-27350

URL Tags
http://packetstormsecurity.com/files/171982/PaperCut-MF-NG-Authentication-Bypass-Remote-Code-Execution.html Third Party Advisory VDB Entry
http://packetstormsecurity.com/files/172022/PaperCut-NG-MG-22.0.4-Authentication-Bypass.html Exploit Third Party Advisory VDB Entry
http://packetstormsecurity.com/files/172512/PaperCut-NG-MG-22.0.4-Remote-Code-Execution.html Exploit Third Party Advisory VDB Entry
http://packetstormsecurity.com/files/172780/PaperCut-PaperCutNG-Authentication-Bypass.html Exploit Third Party Advisory VDB Entry
https://news.sophos.com/en-us/2023/04/27/increased-exploitation-of-papercut-drawing-blood-around-the-internet/ Third Party Advisory
https://www.papercut.com/kb/Main/PO-1216-and-PO-1219 Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-23-233/ Third Party Advisory VDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27350 US Government Resource
cvelogic Threat Intelligence