CISA and FBI Release Joint Advisory in Response to Active Exploitation of PaperCut Vulnerability

Release Date

CISA and FBI have released a joint Cybersecurity Advisory (CSA), Malicious Actors Exploit CVE-2023-27350 in PaperCut MF and NG. This joint advisory provides details related to an exploitation of PaperCut MF/NG vulnerability (CVE-2023-27350). FBI observed malicious actors exploit CVE-2023-27350 beginning in mid-April 2023 and continuing through the present. In early May 2023, FBI observed a group self-identifying as the Bl00dy Ransomware Gang attempting to exploit vulnerable PaperCut servers against the Education Facilities Subsector. The advisory further provides detection methods for exploitation and details known indicators of compromise (IOCs) related to the group’s activity.

CISA encourages network defenders to review and apply the recommendations in the Detection Methods and Mitigations sections of this CSA. See for additional guidance on ransomware protection, detection, and response.

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