CISA KEV · Known exploitedCritical

CVE-2023-27350

PaperCut MF/NG

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.

CVSS: 9.8
EPSS: 100.0%
CISA KEV: Listed
Published: 2023.04.21

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability100.0%

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: PaperCut MF/NG
Affected versions: 22.0.5 (Build 63914), >= 8.0 < 20.1.7, >= 21.0.0 < 21.2.11, >= 22.0.0 < 22.0.9
Fixed versions: 20.1.7, 21.2.11, 22.0.9

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2023.05.12

1
Identify
Confirm that PaperCut MF/NG and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-284
KEV added: 2023.04.21
Ransomware use: 확인됨