CVE-2023-27350 (GCVE-0-2023-27350)
Vulnerability from cvelistv5 – Published: 2023-04-20 00:00 – Updated: 2025-10-21 23:05Summary
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.
Severity
9.8 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2023-12-22 05:01 UTC
CWE
- CWE-284 - Improper Access Control
Assigner
References
8 references
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f921f2b5-d639-4d84-afab-d14677fe5bcb
Exploited: Yes
Timestamps
First Seen: 2023-04-21
Asserted: 2023-04-21
Scope
Notes: PaperCut MF/NG Improper Access Control Vulnerability | Affected: PaperCut / MF/NG | Description: PaperCut MF/NG contains an improper access control vulnerability within the SetupCompleted class that allows authentication bypass and code execution in the context of system. | Required action: Apply updates per vendor instructions. | Due date: 2023-05-12 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://www.papercut.com/kb/Main/PO-1216-and-PO-1219; https://nvd.nist.gov/vuln/detail/CVE-2023-27350
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-284 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | MF/NG |
| Due Date | 2023-05-12 |
| Date Added | 2023-04-21 |
| Vendorproject | PaperCut |
| Vulnerabilityname | PaperCut MF/NG Improper Access Control Vulnerability |
| Knownransomwarecampaignuse | Known |
References
Created: 2026-10-02 08:09 CEST
| Updated: 2026-10-02 08:09 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4bd7ac82-763a-4721-998f-d6b6a312aa9a
Exploited: Yes
Timestamps
First Seen: 2023-04-21
Asserted: 2023-04-21
Scope
Notes: This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication... | Affected: PaperCut / NG | CVSS: 9.8 (CRITICAL) | EPSS: 0.99999 | Used in malware: yes | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Confirmed Compromise
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication... |
| Cve Id | CVE-2023-27350 |
| Vendor | PaperCut |
| Ghsa Id | None |
| Product | NG |
| Added Date | 2023-04-21T00:00:00.000Z |
| Cvss Score | 9.8 |
| Epss Score | 0.99999 |
| Previous Ids | |
| Cvss Severity | CRITICAL |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.99995 |
| Used In Malware | yes |
| Vulnerability Id | CVE-2023-27350 |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-02 09:11 CEST
| Updated: 2026-10-02 09:11 CEST
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"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2023-06-07T00:00:00.000Z",
"orgId": "99f1926a-a320-47d8-bbb5-42feb611262e",
"shortName": "zdi"
},
"references": [
{
"url": "https://www.zerodayinitiative.com/advisories/ZDI-23-233/"
},
{
"url": "https://www.papercut.com/kb/Main/PO-1216-and-PO-1219"
},
{
"url": "http://packetstormsecurity.com/files/171982/PaperCut-MF-NG-Authentication-Bypass-Remote-Code-Execution.html"
},
{
"url": "http://packetstormsecurity.com/files/172022/PaperCut-NG-MG-22.0.4-Authentication-Bypass.html"
},
{
"url": "https://news.sophos.com/en-us/2023/04/27/increased-exploitation-of-papercut-drawing-blood-around-the-internet/"
},
{
"url": "http://packetstormsecurity.com/files/172512/PaperCut-NG-MG-22.0.4-Remote-Code-Execution.html"
},
{
"url": "http://packetstormsecurity.com/files/172780/PaperCut-PaperCutNG-Authentication-Bypass.html"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "99f1926a-a320-47d8-bbb5-42feb611262e",
"assignerShortName": "zdi",
"cveId": "CVE-2023-27350",
"datePublished": "2023-04-20T00:00:00.000Z",
"dateReserved": "2023-02-28T00:00:00.000Z",
"dateUpdated": "2025-10-21T23:05:48.700Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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