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CVE-2025-3935: ConnectWise ScreenConnect Improper Authentication Vulnerability

criticalknown exploitedCVE-2025-3935
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: ConnectWiseproduct: ScreenConnectAuthentication bypassCode injectionOther
What
This vulnerability could allow a ViewState code injection attack, which could allow remote code execution if machine keys are compromised.
Who is affected
ConnectWise ScreenConnect is affected by this vulnerability.
Urgency
Remediation is urgent as exploitation is confirmed and the severity is critical.
Action
Update to the latest version to mitigate the vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-06-02
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-3935

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-3935coverage & exploitation statusNVD · CVE.org

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