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ExploitedIn CISA KEVFix available

CVE-2023-27350

Exploitation confirmed. First attested on 2023-04-21 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

  • Published2023-04-20
  • Fixed in22.0.9 · 21.2.11 · 20.1.7
  • WeaknessCWE-284

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2023-04-2016:15CVE publishedNVD
  2. 2023-04-21Added to the CISA KEV catalogCISA KEV
  3. 2023-04-21Listed as exploited by GCVEGCVE
  4. 2023-04-21Exploitation first reportedCISA KEV
  5. 2023-04-25Exploit-DB entryExploit-DB
  6. 2023-12-2205:01SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-02 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-27350?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-27350?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Papercut papercut mf
BranchAffectedFixed in
22.0≥ 22.0.0, < 22.0.922.0.9
21.x≥ 21.0.0, < 21.2.1121.2.11
20.1≥ 8.0, < 20.1.720.1.7
Papercut papercut ng
BranchAffectedFixed in
22.0≥ 22.0.0, < 22.0.922.0.9
21.x≥ 21.0.0, < 21.2.1121.2.11
20.1≥ 8.0, < 20.1.720.1.7

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As zdi, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • PaperCut NG
    Affected
    • = 22.0.5 (Build 63914)no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-06-07

Fix

  1. Update Papercut papercut mf to 22.0.9 · 21.2.11 · 20.1.7
  2. CISA’s required action: Apply updates per vendor instructions.due 2023-05-12

Advisories and patches

Detection

read 2026-11-01 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
EDB-51391EDB-51452
Exploit-DB
Proof-of-concept repositories
14 repositories, unverifiedMaanVader/CVE-2023-27350-POCimancybersecurity/CVE-2023-27350-POChorizon3ai/CVE-2023-27350adhikara13/CVE-2023-27350Ap0dexMe0/CVE-2023-27350
PoC-in-GitHub
Metasploit modules
1 moduleexploit/multi/http/papercut_ng_auth_bypassrank: excellentModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2023-04-21
Patch Due Date
2023-05-12
Ransomware Use
Known
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2023-04-20
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-cfg6-7x4x-p3pj

Frequently asked questions

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.

Is CVE-2023-27350 actively exploited?

Yes. CVE-2023-27350 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2023-05-12.

What is the CVSS score for CVE-2023-27350?

CVE-2023-27350 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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