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CVE-2023-27350

CRITICAL 9.8 KNOWN EXPLOITED RANSOMWARE PoC CATALOGUED DETECTION TEMPLATE ALL-YEARS

Published 2023-04-20 · Last modified 2025-10-21 · zdi · NVD: Analyzed

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.

ACTIVELY EXPLOITED

Confirmed exploited in the wild — in CISA KEV since 2023-04-21, linked to ransomware campaigns. Patch or mitigate now.

Exploitation likelihood

100.0%chance of exploitation in 30 days · 100th percentile

● In CISA KEV (2023-04-21)● Catalogued PoC◆ SSVC: exploitation active, automatable yes

Impact if exploited

9.8CVSS 3.1 · CRITICAL · NVD

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

Public PoC or exploit resources are catalogued below.

Listed by the named source; Vulnpedia has not tested these resources.

PoC data: JSON

Detection templates

Detection checks are listed separately from PoCs.

Resource commands

nuclei -id CVE-2023-27350 -u https://TARGETDetection template — review its checks and affected versions before use.
searchsploit --cve CVE-2023-27350 && searchsploit -m 51391Fetch the ExploitDB PoC locally; review the code before running it.
searchsploit --cve CVE-2023-27350 && searchsploit -m 51452Fetch the ExploitDB PoC locally; review the code before running it.
curl -s https://vulnpedia.com/cve/CVE-2023-27350/poc.jsonMachine-readable PoC index for this CVE (for automation).

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Papercut

Products Ng Papercut Mf Papercut Ng

Weakness (CWE)

  • CWE-284: : Improper Access Control

CVSS vector

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

References and research data (JSON)

Unverified PoC candidates

Catalogue matches for further research. These repositories have not been validated as working exploits.

14 candidates

Additional exploitation reports

Source-specific reports, separate from CISA KEV. Repeated observations from one source are not independent confirmations.

816 more source reports

Known Affected Software Configurations

VendorProductVersion range
PapercutPapercut Mf≥ 8.0 and < 20.1.7
PapercutPapercut Mf≥ 21.0.0 and < 21.2.11
PapercutPapercut Mf≥ 22.0.0 and < 22.0.9
PapercutPapercut Ng≥ 8.0 and < 20.1.7
PapercutPapercut Ng≥ 21.0.0 and < 21.2.11
PapercutPapercut Ng≥ 22.0.0 and < 22.0.9

All CVSS metrics

  • CRITICAL 9.8 v3.0 · CNA Primary
    CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CRITICAL 9.8 v3.1 · NVD Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CRITICAL 9.8 v3.0 · NVD Secondary
    CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Exploit-tagged references (not proof of a PoC)

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS