Security readout for executives and security teams
Plain-English summary
CVE-2023-27351 lets a remote attacker bypass authentication on affected PaperCut NG installations. For executives, the main concern is unauthorized access to a print-management system without needing credentials. CISA lists this CVE in KEV, so treat exposed affected systems as urgent until remediated or ruled out.
Executive priority
Prioritize within the active vulnerability response queue. KEV listing, unauthenticated remote access, and high confidentiality impact make this a business-relevant exposure for any organization running affected PaperCut NG versions.
Technical view
The flaw affects PaperCut NG 22.0.5 Build 63914 in the SecurityRequestFilter class. ZDI describes improper implementation of the authentication algorithm, enabling unauthenticated remote authentication bypass. CVSS is 8.2 with network attack vector, low complexity, no privileges, no user interaction, high confidentiality impact, and low integrity impact.
Likely exposure
Known affected exposure is PaperCut NG 22.0.5 Build 63914. Risk is highest where the PaperCut service is reachable from untrusted networks. The source bundle does not identify other affected products, versions, or deployment configurations.
Exploitation context
CISA KEV status indicates known exploitation. The provided sources do not give safe detail on attacker campaigns, exploit mechanics, or prevalence, so no further exploitation claims should be made from this bundle.
Researcher notes
Evidence is specific to PaperCut NG 22.0.5 Build 63914 and CWE-287. The bundle supports authentication-bypass impact and KEV exploitation status, but not exploit chain details, affected version ranges beyond the named build, or definitive patch versions.
Mitigation direction
- Inventory PaperCut NG installations and identify version 22.0.5 Build 63914.
- Review PaperCut advisory PO-1216 and PO-1219 for vendor-supported remediation.
- Apply vendor-provided updates or mitigations where applicable.
- Restrict PaperCut access to trusted administrative networks where operationally possible.
- Prioritize KEV remediation timelines for any exposed affected systems.
Validation and detection
- Confirm installed PaperCut NG version and build number on each server.
- Check whether PaperCut interfaces are reachable from untrusted networks.
- Review authentication and administrative logs for unexpected access.
- Verify remediation against PaperCut's advisory after changes.
- Document any unaffected systems with evidence of version or compensating controls.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-287: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2023-27351 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.2 (3.0)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N3.94.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.2HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.papercut.com/kb/Main/PO-1216-and-PO-1219CVE reference
- https://www.zerodayinitiative.com/advisories/ZDI-23-232/CVE reference
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27351CVE reference · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Authentication
Improper Authentication represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.