Exploited CVEs / CVE-2023-27350

CVE-2023-27350

Patch immediately
Exploited in the wild and used in ransomware campaigns.
No vendor fix is mapped yet. This page refreshes daily and will name the patch the day one is published.
Do this now: Move this ahead of everything else in the queue, then verify the fix actually landed on every exposed device.

Actively exploited PaperCut MF/NG vulnerability, Critical severity, CVSS 9.8. Added to the CISA KEV catalog 2023-04-21.

All about CVE-2023-27350: the Senserva AI read, the CISA required action and deadline, the official fix, and the questions admins ask.

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Senserva AI read on CVE-2023-27350CISA required actionOfficial fix for CVE-2023-27350Admin questions#92 hottest CVE right now

PaperCut MF/NG Improper Access Control Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted, and the vulnerability is known to be used in ransomware campaigns. Federal agencies were required to remediate by 2023-05-12 (that deadline has passed); treat that date as the outer bound for your own environment. Check the vendor security advisory for the fix.

CriticalCISA KEVRansomware

Risk summary

CVSS base
9.8
EPSS exploit probability
100%
Severity
Critical
Added to KEV
2023-04-21
CISA due date
2023-05-12 (past due)

Senserva AI Opinion for CVE-2023-27350

Print management servers became ransomware beachheads through this PaperCut MF/NG flaw: an improper access control bug in the SetupCompleted class allows authentication bypass and code execution as SYSTEM. It is rated Critical (CVSS 9.8), scores 100% EPSS, and has confirmed ransomware use dating from its April 2023 KEV listing. PaperCut servers are common in education and healthcare, sectors extortion crews already favor.

Do this: Patch PaperCut servers now and block inbound internet access to the management port while you verify integrity.

AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2023-27350

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Full tracking and change history for CVE-2023-27350

Published
2023-04-21
Last revised
2023-04-21
Changes tracked
1

Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.

CISA required action

Federal (BOD 22-01) remediation due date: 2023-05-12 (past due).

Apply updates per vendor instructions.

Official fix for CVE-2023-27350

Check the vendor's security advisory channel for the patched MF/NG versions and workarounds.

CISA KEV entry

Common questions about CVE-2023-27350

Is CVE-2023-27350 actively exploited?

Yes. CVE-2023-27350 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2023-04-21, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 100%. CISA also reports it is known to be used in ransomware campaigns.

What is the CISA deadline and required action for CVE-2023-27350?

CISA set the federal (BOD 22-01) remediation due date at 2023-05-12, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply updates per vendor instructions.

What fixes CVE-2023-27350?

Check the vendor's security advisory for the patched MF/NG versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.

Can I ask my own AI about CVE-2023-27350?

Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2023-27350's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed three times a day (5 AM, 12:30 PM, and 7 PM US Central).

More exploited PaperCut CVEs

The newest PaperCut entries on the CISA KEV catalog:

CVE-2023-27351CVE-2023-2533

Authoritative references

CVE recordNVD detailCISA KEV catalogFIRST.org EPSS

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Lexicon: the terms on this page
CVE
Common Vulnerabilities and Exposures. A unique ID for one publicly known vulnerability, such as CVE-2025-1234.
KB
Microsoft Knowledge Base article. The identifier for a specific Microsoft update.
KEV
CISA Known Exploited Vulnerabilities. CVEs confirmed exploited in the wild. Fix these first.
CVSS
Common Vulnerability Scoring System. A standardized Severity score from 0 to 10.
EPSS
Exploit Prediction Scoring System. The probability a CVE will be exploited in the next 30 days.
MSRC
Microsoft Security Response Center. Microsoft's Patch Tuesday advisories and KB-to-CVE mapping.
NVD
National Vulnerability Database (NIST). Authoritative CVE metadata and CVSS scores.
Ransomware
The vulnerability is linked to known ransomware activity.
Reference: Microsoft CVE and vulnerability management, the full CVE-to-patch lookup ranked by real-world risk, and the Microsoft patching guide, how Intune, Windows Autopatch, Defender, and Azure Update Manager fit together.
Data notice: this page, the feeds, and the API are provided as is, for informational purposes only, without warranty of any kind. Senserva, LLC does not guarantee the accuracy, completeness, or timeliness of third-party data (MSRC, NVD, CISA KEV, EPSS) and accepts no liability for actions taken based on it; verify against the authoritative vendor advisory before acting. Built daily with Senserva Trustworthy AI. All use of this data is subject to the Senserva EULA.