CVE-2023-27351

CVE Enrichment

CVSS: 7.5 HIGH
EPSS: 78.05%
EPSS Percentile: 99.57%
CISA KEV: YES — Known Exploited Vulnerability

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 SecurityRequestFilter class. The issue results from improper implementation of the authentication algorithm. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-19226.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: zdi-disclosures@trendmicro.com
Published: 20-Apr-2023 23:15
Last Modified: 02-Oct-2026 02:17
EPSS Date: 2026-10-18
CWE: CWE-287

CVSS Vector


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

CISA KEV Details

Date Added: 2026-04-20
Remediation Due: 2026-05-04
Known Ransomware Campaign Use: Known
Required Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes: https://www.papercut.com/kb/Main/PO-1216-and-PO-1219 ; https://nvd.nist.gov/vuln/detail/CVE-2023-27351

Affected Products / Versions

papercut / papercut_mf
Version / affected range: * · from (inclusive) 15.0 · before (exclusive) 20.1.7
cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*
papercut / papercut_mf
Version / affected range: * · from (inclusive) 21.0.0 · before (exclusive) 21.2.11
cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*
papercut / papercut_mf
Version / affected range: * · from (inclusive) 22.0.0 · before (exclusive) 22.0.9
cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*
papercut / papercut_ng
Version / affected range: * · from (inclusive) 15.0 · before (exclusive) 20.1.7
cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*
papercut / papercut_ng
Version / affected range: * · from (inclusive) 21.0.0 · before (exclusive) 21.2.11
cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*
papercut / papercut_ng
Version / affected range: * · from (inclusive) 22.0.0 · before (exclusive) 22.0.9
cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*

References

Last enrichment sync: 19-Oct-2026 18:37
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

These threats have been tagged by the Zero Day Initiative as ZDI-CAN-19226 (CVE-2023-27351) and ZDI-CAN-18987 (CVE-2023-27350). Huntress Details PaperCut Zero-Day Exploitation and Remote Code Execution Chain

CVE (1)

Malware (1)

People (1)

Threat Actors (3)

MITRE ATT&CK (8)

Vendors (1)

Products (3)

Tools (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.