VulnerabilityDeferred

CVE-2025-7771

ThrottleStop.sys, a legitimate driver, exposes two IOCTL interfaces that allow arbitrary read and write access to physical memory via the MmMapIoSpace function.

HIGH 8.7EPSS 6.83%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (6.83%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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: 8.7 HIGHCVSS: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/M
EPSS: 6.83% probability · 94th percentile
CISA KEV: Not listed
Weakness: CWE-782
Source: vulnerability@kaspersky.com

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.