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Exploited vulnerability · CISA KEV

Is CVE-2025-3935 exploited? Yes: in CISA KEV since 2 Jun 2025

Gociux · ConnectWise ScreenConnect · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-3935, ConnectWise ScreenConnect Improper Authentication Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 2 Jun 2025, 38 days after it was published. It affects ConnectWise ScreenConnect. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 2 Jun 2025
ransomwareNot knownno confirmed use
EPSSbelow top 10%lower predicted activity right now (it is still confirmed exploited)
severity8.1CVSS 3.1 · high
US federal due23 Jun 2025BOD 22-01 deadline

What it is

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.

VendorConnectWise (4 exploited CVEs in KEV)
ProductScreenConnect
VulnerabilityConnectWise ScreenConnect Improper Authentication Vulnerability
WeaknessCWE-287
Published25 Apr 2025
Added to KEV2 Jun 2025
Reported by (CNA)ConnectWise

What to do

  1. Check whether you run it. Look for ScreenConnect in your asset inventory, including appliances and cloud images. Stack check lists every exploited ConnectWise CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 25 Apr 2025.
  4. Get told next time. Email alerts when CISA adds a CVE for ConnectWise.

Other exploited CVEs in ScreenConnect

References

Questions

Is CVE-2025-3935 being exploited?

Yes. CISA added CVE-2025-3935 to the Known Exploited Vulnerabilities catalog on 2 Jun 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2025-3935 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2025-3935?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check ConnectWise's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected ScreenConnect and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in June 2025 · ConnectWise scorecard · act-now radar.

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