by Kastro
Paper/Archive/CVE-2025-14265

CVE-2025-14265

ConnectWise ScreenConnect — Improper server-side validation in ScreenConnect extension framework

EPSS 0.4%CVSS 9.1
critical.is priorityof 100
33
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 30.7.307 × 206.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

In versions of ScreenConnect™ prior to 25.8, server-side validation and integrity checks within the extension subsystem could allow the installation and execution of untrusted or arbitrary extensions by authorized or administrative users. Abuse of this behavior could result in the execution of custom code on the server or unauthorized access to application configuration data. This issue affects only the ScreenConnect server component; host and guest clients are not impacted. ScreenConnect 25.8 introduces enhanced server-side configuration handling and integrity checks to ensure only trusted extensions can be installed.

Affected

ProductAffectedFixed inSource
ScreenConnectAll versions prior to 2025.8–CNA

Scores by source

ConnectWise (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refconnectwise.com/company/trust/security-bulletins/screenconnect-2025.8-security-patch