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ConnectWise Compromised by 'Sophisticated' Nation State

  • In November 2024, ConnectWise experienced a cyberattack that compromised its systems and affected a very limited number of customers using cloud-based ScreenConnect instances.
  • The breach occurred due to suspicious activity linked to a sophisticated nation-state actor, leading ConnectWise to launch an investigation with forensic experts Mandiant and coordinate with law enforcement.
  • ConnectWise addressed two critical security issues, including CVE-2025-3935, a high-severity vulnerability involving ViewState code injection found in ScreenConnect releases up to version 25.2.3. This flaw could enable remote code execution if an attacker first obtains the machine keys.
  • The company implemented enhanced monitoring and security hardening across its environment and reported no further suspicious activity since the patch deployment while notifying all affected customers.
  • The incident highlights risks in remote access solutions widely used by managed service providers and IT teams, suggesting ongoing threats from nation-state actors exploiting software vulnerabilities.
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BleepingComputer broke the news in on Thursday, May 29, 2025.
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