CVE-2025-7771

Published Aug 6, 2025

Last updated 4 months ago

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-7771 is a vulnerability found in ThrottleStop.sys, a legitimate driver. The driver exposes IOCTL interfaces that allow reading and writing to physical memory. This is made possible via the MmMapIoSpace function. Attackers are exploiting this vulnerability by using a "Bring Your Own Vulnerable Driver" (BYOVD) technique to disable antivirus processes. By exploiting the exposed I/O control codes, attackers can access kernel-level functions directly, enabling them to read or write memory addresses. This allows them to bypass security defenses and install ransomware.

Description: ThrottleStop.sys, a legitimate driver, exposes two IOCTL interfaces that allow arbitrary read and write access to physical memory via the MmMapIoSpace function. This insecure implementation can be exploited by a malicious user-mode application to patch the running Windows kernel and invoke arbitrary kernel functions with ring-0 privileges. The vulnerability enables local attackers to execute arbitrary code in kernel context, resulting in privilege escalation and potential follow-on attacks, such as disabling security software or bypassing kernel-level protections. ThrottleStop.sys version 3.0.0.0 and possibly others are affected. Apply updates per vendor instructions.
Source: vulnerability@kaspersky.com
NVD status: Awaiting Analysis

Risk scores

CVSS 4.0

Type: Secondary
Base score: 8.7
Impact score: -
Exploitability score: -
Vector string: CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Severity: HIGH

Weaknesses

vulnerability@kaspersky.com: CWE-782

Hype score: Not currently trending

References