CVE-2025-3935: ConnectWise ScreenConnect Improper Authentication Vulnerability
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
- 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
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.
- Exploitation confirmedCVE-2025-3935Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 88% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2025-3935 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for ConnectWise ScreenConnect Improper
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- criticalexploitedCVE-2026-84869: ConnectWise ScreenConnect Improper Privilege Management and Missing Authorization Vulnerabilit…cisa-kev · 2026-09-11
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