CASCACascade Atlas

Evidence dossier

CVE-2023-27351

CVE-2023-27351

76.3–93.1Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Apr 20, 2023
Updated
Apr 21, 2026
Evidence coverage
85%
CISA KEVCatalog member

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

FIRST EPSS77.39%

2026-07-18 · v2026.06.15 · percentile 99.5%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

zdioriginal assertion
container

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.

CISA KEVoriginal assertion
observed_exploitation

PaperCut NG/MF Improper Authentication Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.773880000000; percentile 0.995070000000

Applicability

Cited product scope

Trace impact →
PaperCutNG
[{"status": "affected", "version": "22.0.5 (Build 63914)"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*; start including 15.0; end excluding 20.1.7supported
Unknown vendorUnknown product
cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*; start including 21.0.0; end excluding 21.2.11supported
Unknown vendorUnknown product
cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*; start including 22.0.0; end excluding 22.0.9supported
Unknown vendorUnknown product
cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*; start including 15.0; end excluding 20.1.7supported
Unknown vendorUnknown product
cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*; start including 21.0.0; end excluding 21.2.11supported
Unknown vendorUnknown product
cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*; start including 22.0.0; end excluding 22.0.9supported

Assessments

CVSS by origin

7.5
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.2
zdi-disclosures@trendmicro.comCVSS 3.0 · role SecondaryCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
8.2
zdiCVSS 3.0 · role unknownCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.