CVE-2025-14265Network attack vector

Server code execution via untrusted extension installation

Published Dec 11, 2025 · Updated Dec 11, 2025

Improper code integrity validation in ConnectWise ScreenConnect before 25.8 allows remote authenticated users to execute server code. The extension subsystem accepts and executes extension content without sufficient server-side validation or an integrity check. Authorized or administrative access is required; abuse executes custom server code or reads application configuration data, while host and guest clients remain unaffected.

CVSS severity9.1
Critical
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper code integrity validation in ConnectWise ScreenConnect before 25.8 allows remote authenticated users to execute server code. The extension subsystem accepts and executes extension content without sufficient server-side validation or an integrity check. Authorized or administrative access is required; abuse executes custom server code or reads application configuration data, while host and guest clients remain unaffected.

The record

CVE
CVE-2025-14265
Published
Dec 11, 2025
Updated
Dec 11, 2025
Vendor
ConnectWise
Product
ScreenConnect
Classifications
CWE-494, T1505
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions prior to 2025.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

ConnectWise · ScreenConnectversion=All versions prior to 2025.8

Published CVSS scores

9.1ConnectWiseCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-494Download of Code Without Integrity Check
T1505Server Software Component

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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