Malware

Raspberry Robin

0 mentions in 7 days · 1 in 30 days · 1 total · first seen Aug 29, 2026 · last 17d ago

Timeline1 articles

PaperCut Zero-Day Under Active Attack: Emergency Patch Released

PaperCut warns that a zero-day in NG and MF print management products is being actively exploited, shipping emergency patches with no CVE assigned yet.

PaperCut Software confirmed active exploitation of a zero-day affecting PaperCut NG and MF, with confirmed customer incidents, and released emergency patches on Friday ahead of technical details or a CVE assignment. The company urges customers to restrict web access to trusted IP addresses, disconnect application servers from the internet, and watch for indicators including tampered or truncated server.log files, database error strings, and suspicious activity involving pc-app.exe. The article recalls the May 2023 exploitation of CVE-2023-27350 and CVE-2023-27351 by the financially motivated Lace Tempest group, a Clop ransomware RaaS affiliate, though no attacker attribution has been given for the current campaign.

Security AffairsAug 29, 20:42 UTC · 17d agoExploit / PoC in the wildCVE-2023-27350 CVE-2023-273511

Related CVEsby mentions

CVE-2023-273509.8100%
Authentication Bypass Leading to SYSTEM RCE in PaperCut MF/NG
PaperCut MF and PaperCut NG print management software contain an improper access control flaw (CWE-284) in the SetupCompleted class that allows an unauthenticated attacker to bypass authentication and reach internal administrative functionality. The flaw is triggered by sending crafted, unauthenticated requests to the PaperCut application's web interface, without requiring valid user credentials. A successful attacker gains the ability to execute code in the context of the SYSTEM account on the PaperCut server, typically a Windows print server, giving full control of that host. Any organization running PaperCut MF or NG is potentially affected, and exposure is highest where the server's web interface is reachable from the internet or by untrusted networks. Exploitation is confirmed in the wild: CISA added the flaw to the KEV on 2023-04-21 with known ransomware use, and EPSS rates exploitation probability at 100% within 30 days.
· PaperCut MF · PaperCut NG KEV ransomware PoC ×3mass
CVE-2023-273517.578%
Authentication Bypass in PaperCut NG/MF Print Management Software
CVE-2023-27351 is an improper authentication flaw (CWE-287) in the SecurityRequestFilter class of PaperCut NG and MF print management software, where the authentication algorithm is improperly implemented. A remote, unauthenticated attacker can trigger it over the network with no user interaction or special privileges to bypass authentication on the affected server (CVSS 3.1: 7.5). Once authentication is bypassed, the attacker gains access to the PaperCut system; in observed campaigns this access was leveraged to deliver Cl0p and LockBit ransomware, as confirmed by Microsoft. Organizations running PaperCut NG (version 22.0.5, Build 63914, is cited in the advisory) or PaperCut MF are affected. The flaw was exploited as a zero-day, is CISA KEV-listed (added 2026-04-20) with known ransomware use, and EPSS places the 30-day exploitation probability at 78.1%.
· PaperCut NG 22.0.5 (Build 63914) explicitly cited as affected; CISA lists PaperCut NG broadly without a full version range · PaperCut MF affected per CISA listing; no specific version range provided in the data KEV ransomwarelarge

Appears with

threat actor DEV-0950 1 threat actor Lace Tempest 1 organization Clop 1 product PaperCut MF 1 product PaperCut NG 1 vendor Microsoft 1 vendor PaperCut 1

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