CVE-2025-14265CWE-494

CVE-2025-14265

Critical · published December 11, 2025

CVSS v3.1
9.1
EPSS
0%
Percentile
29.5
In the wild
Unconfirmed
What it is

🚨 A sneaky oversight in ScreenConnect™ prior to version 25.8 can let authorized users run untrusted extensions on your server—think of it as giving the keys to the kingdom to anyone with a badge! 🔥 Imagine a hotel with a fancy suite where guests can submit their own room service menus. If the management doesn't check those menus, guests could order anything they want, including items that aren’t safe or authorized. That’s what this vulnerability allows with untrusted code! An attacker could exploit this flaw to run arbitrary code on the server, potentially accessing sensitive configuration data or altering server operations—an absolute nightmare for any business relying on secure remote connections! The consequences could range from data breaches to complete server takeover.

Put simply

Imagine a hotel with a fancy suite where guests can submit their own room service menus. If the management doesn't check those menus, guests could order anything they want, including items that aren’t safe or authorized. That’s what this vulnerability allows with untrusted code! This vulnerability stems from inadequate server-side validation and integrity checks in ScreenConnect's extension subsystem, allowing authorized users to install and execute potentially harmful extensions without proper scrutiny.

What to do

An attacker could exploit this flaw to run arbitrary code on the server, potentially accessing sensitive configuration data or altering server operations—an absolute nightmare for any business relying on secure remote connections! The consequences could range from data breaches to complete server takeover. To protect your system, immediately upgrade to ScreenConnect version 25.8 or later, which includes improved server-side handling and integrity checks for extensions. Regularly audit installed extensions to ensure they are trusted and necessary. You've got this! By following these steps, you can secure your server and keep those unwanted guests out. 🛡️

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00368 · 29.5th percentile
Weakness
CWE-494 · Download of Code Without Integrity Check
Published
2025-12-11T20:15Z
Affected products (1)
ProductVersionsFixed in
connectwise/screenconnect< 25.8.0.943825.8.0.9438
References (1)
EPSS history
Timeline
  • 11 DEC 14:21Z
    Improper server-side validation in ScreenConnect extension framework
    cvelistv5