Protected-process termination via unrestricted driver handle
Published Oct 29, 2025 · Updated Oct 29, 2025
Improper access control in ThreatFire System Monitor 4.7.0.53 allows local users to terminate protected processes through TfSysMon.sys. The driver device lacks a restrictive DACL, so low-privileged users can open \.\TfSysMon and submit IOCTL 0xb4a00404 with a chosen process ID for kernel-mode termination. A local low-privileged account is required; successful use can stop PPL-protected security agents or critical system processes, enabling EDR evasion or a local service interruption.
Summary
What happened
Improper access control in ThreatFire System Monitor 4.7.0.53 allows local users to terminate protected processes through TfSysMon.sys. The driver device lacks a restrictive DACL, so low-privileged users can open \.\TfSysMon and submit IOCTL 0xb4a00404 with a chosen process ID for kernel-mode termination. A local low-privileged account is required; successful use can stop PPL-protected security agents or critical system processes, enabling EDR evasion or a local service interruption.
The record
- CVE
- CVE-2025-61156
- Published
- Oct 29, 2025
- Updated
- Oct 29, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-284, T1562.001
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 29, 2025CVE publishedPublication date reported by the CVE source.
- Oct 29, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- D7EAD TfSysMon process-termination PoCfunctional · demonstrated
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Reported exploitation
- Reported BYOVD abuse for EDR evasionreported exploitation
Technologies
Your stack
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Your stack
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