Is CVE-2023-27351 in the CISA KEV catalog?

Yes. CVE-2023-27351 is on the CISA Known Exploited Vulnerabilities list, added 2026-04-20, and has known ransomware campaign use.

What is the CVSS severity of CVE-2023-27351?

CVE-2023-27351 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2023-27351?

CVE-2023-27351 has an EPSS score of 77.39% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-27351?

Upgrade papercut mf to 22.0.9 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2023-27351

HIGHCISA KEVEPSS 100th pctl

7.5

CVSS v3

NVD

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 SecurityRequestFilter class. The issue results from improper implementation of the authentication algorithm. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-19226.

CWE-287Improper Authentication

How to fix

Remediation Available

papercut mfNVD

Affected:>= 22.0.0, < 22.0.9Fixed in:22.0.9CVE-2023-27351derived from NVD

papercut ngNVD

Affected:>= 22.0.0, < 22.0.9Fixed in:22.0.9CVE-2023-27351derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

77.39%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-05-04

Associated with ransomware campaigns

References

Vendor Advisory1

papercut.com

Third-Party Advisory1

zerodayinitiative.com

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-287 (Improper Authentication) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-35082	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-35078	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2017-7921	Critical	9.8	100%	KEV	-
CVE-2024-7593	Critical	9.8	100%	KEV	-
CVE-2023-46805	High	8.2	100%	KEV + Ransom	-
CVE-2022-40684	Critical	9.8	100%	KEV + Ransom	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-21.