Home/CVE/In versions of ScreenConnect™ prior to 25.8, server-side validation and integrity checks within the extension subsyste
CVE

CVE-2025-14265

In versions of ScreenConnect™ prior to 25.8, server-side validation and integrity checks within the extension subsyste

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.

CRITICAL · CVSS 9.1 EPSS 0.00065
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules8 YARA rules0
⬡

Weakness Classification

CWE-494Download of Code Without Integrity Check
▤

Affected Products & Versions

1
connectwise screenconnect< 25.8.0.9438
◈

Sigma Hunt Rules

8
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighRemote Access Tool - ScreenConnect Server Web Shell Execution
productmediumScreenConnect Temporary Installation Artefact
productmediumRemote Access Tool - ScreenConnect Installation Execution
productmediumRemote Access Tool - ScreenConnect Potential Suspicious Remote Command Execution
productmediumRemote Access Tool - ScreenConnect Execution
productlowRemote Access Tool - ScreenConnect Temporary File
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Scoring & Timeline

9.1
CRITICAL · CVSS v3.1 · 7d616e1a-3288-43b1-a0dd-0a65d3e70a49
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD11 Dec 2025 · 03:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.connectwise.com/company/trust/security-bulletins/screenconnect-2025.8-security-patchVendor Advisory
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