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VulnerabilityCVE-2023-27350Published 2023-04-20

CVE-2023-27350 — Papercut Mf

criticalCISA KEVRansomwarePublic exploit11 PoC reposNuclei template

As of 2025-10-21, CVE-2023-27350 is a CRITICAL-severity vulnerability in Papercut Mf, CVSS v3.1 9.8, EPSS 99.9% (99.9th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-04-21), with a US federal remediation deadline of 2023-05-12, and CISA links it to known ransomware campaigns. Threadlinqs Intelligence links 4 tracked threat campaigns to CVE-2023-27350, most recently “Cl0p Ransomware MFT Attack Pattern: Multi-Year Zero-Day Campaigns Against File Transfer and Enterprise Software (2020-2025)”.

CVSS v3.1
9.8/10Critical
EPSS
99.9%Higher than 99.9% of scored CVEs
CISA KEV
ListedAdded · due 2023-05-12
Tracked threats
4Campaigns referencing it
Priority
10/10Threadlinqs triage score
Published
Updated 2025-10-21
CVSS v3.1 9.8 (CRITICAL) · EPSS 99.9% (higher than 99.9% of all scored CVEs) · Priority 10/10 · Published 2023-04-20

Last updated:

What is CVE-2023-27350?

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.

The record classifies CVE-2023-27350 under weakness classes CWE-284, NVD-CWE-Other. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1275 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
99.9% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
CISA KEV
Listed since 2023-04-21, federal remediation deadline 2023-05-12 — used in known ransomware campaigns
Threadlinqs priority
10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
Published
2023-04-20, last modified 2025-10-21

Is CVE-2023-27350 being exploited?

CISA added CVE-2023-27350 to the Known Exploited Vulnerabilities catalog on 2023-04-21, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2023-05-12 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. Weaponised exploit code for CVE-2023-27350 is publicly available. 11 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (http/cves/2023/CVE-2023-27350.yaml). It currently carries a trending score of 50 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2023-27350

Vendor advisory: https://www.papercut.com/kb/Main/PO-1216-and-PO-1219. Because CVE-2023-27350 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2023-05-12. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2023-27350

4 tracked threats in the Threadlinqs corpus reference CVE-2023-27350, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Other references

Showing 5 of 7 recorded references.