Risk Letters

Exploited vulnerability

CVE-2025-3935

TLP:CLEAR

ConnectWise ScreenConnect Improper Authentication Vulnerability

ConnectWise ScreenConnect contains an improper authentication vulnerability. This vulnerability could allow a ViewState code injection attack, which could allow remote code execution if machine keys are compromised.

Facts

  • Vendor: ConnectWise
  • Product: ScreenConnect
  • CVSS: 8.1
  • EPSS (probability of exploitation within 30 days): 3.6 %
  • On CISA's Known Exploited Vulnerabilities list since: 2 June 2025
  • First known exploitation: 2 June 2025
  • CISA's deadline for US federal agencies: 23 June 2025
  • Weakness: CWE-287
  • First seen by Risk Letters: 2 June 2025

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD