Vulnerability in Little Orbit Gamefirst Anti-Cheat

CVE-2026-12166

A NULL pointer dereference vulnerability for driver `GFAC_Sys_x64.sys` in Little Orbit GFAC allows a local attacker to cause a denial of service via crafted requests that trigger a system crash.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (3.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-12166: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-12166?
CVE-2026-12166 is a medium-severity vulnerability in Little Orbit Gamefirst Anti-Cheat, classified under CWE-476 NULL POINTER DEREFERENCE. CVSS score: 5.5/10. Published 2026-07-02.
How severe is CVE-2026-12166?
Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2026-12166 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.