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Vulnerability record · CVE-2025-7771 · published 6 August 2025

CVE-2025-7771: ThrottleStop.sys, a legitimate driver, exposes two IOCTL interfaces that allow arbitrary read and write access…

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.

8.7 CVSS 4.0 High EPSS 7.2% · top 5.9% CWE-782 · CWE-782 Deferred
8.7CVSS 4.0 base score
7.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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:

References

LinkTags
https://github.com/klsecservices/Advisories/blob/master/K-TechPowerUp-2025-001.md
https://securelist.com/av-killer-exploiting-throttlestop-sys/117026/
https://www.techpowerup.com/download/techpowerup-throttlestop/

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.8CVE-2021-21551Dell dbutil_2_3.sys driver insufficient access control privilege escalationThe Dell dbutil_2_3.sys driver contains insufficient access control that lets a local user reach privileged driver operations. It matters because the…KEVEPSS 79%analysed

Source: NIST National Vulnerability Database (record CVE-2025-7771), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.