CVE-2025-7771ThrottleStop.sys Vulnerability
ThrottleStop.sys, a legitimate driver, exposes two IOCTL interfaces that allow arbitrary read and write access to physical memory via the MmMapIoSpace function.
Published Aug 6, 2025 · Updated Apr 14, 2026
Key Facts
Patch immediately- CVE-2025-7771 is a high-severity vulnerability (CVSS 8.7 v4) affecting ThrottleStop.sys.
- It is exploited in the wild, listed in Industry KEV feed since Aug 5, 2025. Public exploit code is available.
- EPSS estimates a 8.1% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v4
8.7
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
EPSS (30-day exploit likelihood)
8.1%
Higher than 94.8% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
58/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Aug 5, 2025
-1 days after publication
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
5
Proof-of-concept links
In-the-wild evidence
9
Reports of active use
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Aug 5, 2025 | n/a | Not reported |
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ThrottleStop.sys | >= 3.0.0.0 and possibly others | n/a |
Timeline
Added to Industry KEV feed
Aug 5, 2025
Publicly disclosed
Aug 6, 2025
Last updated
Apr 14, 2026
Weakness Type
- CWE-782 Exposed IOCTL with Insufficient Access Control
References
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
ThrottleStop.sys, a legitimate driver, exposes two IOCTL interfaces that allow arbitrary read and write access to physical memory via the MmMapIoSpace function.
Affected: ThrottleStop.sys versions >= 3.0.0.0 and possibly others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Aug 5, 2025.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2025-7771 On Your Attack Surface?
Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.
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