CVE-2025-10905: Collision in minifilter driver of Avast Free Antivirus results in disabling of real-time protection

Severity: medium (CVSS 4.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-11-11 · updated 2026-10-18
Weakness: CWE-693

Description

Collision in MiniFilter driver in Avast Software Avast Free Antivirus before 25.9 on Windows allows a local attacker with administrative privileges to disable real-time protection and self-defense mechanisms.

Affected products

Avast Free Antivirus: before 25.9 — fixed in 25.9

How to fix

Upgrade to a fixed version: Avast Free Antivirus 25.9. Check the vendor advisory for mitigations.

References

https://www.gendigital.com/us/en/contact-us/security-advisories/)

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