Vulnerability in Connectwise Screenconnect
CVE-2026-3564
A condition in the ScreenConnect server component may allow an actor with access to server-level cryptographic material used for authentication to obtain unauthorized access, including elevated privileges, in certain scenarios. ScreenConne…
EPSS: 0.004 (28.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Connectwise Screenconnect — versions All server versions prior to 26.1, All versions prior to 26.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-3564?
- CVE-2026-3564 is a critical-severity vulnerability in Connectwise Screenconnect, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.0/10. Published 2026-03-17.
- How severe is CVE-2026-3564?
- Critical severity. CVSS v3 base score is 9.0 out of 10.