9.0CRITICAL

CVE-2025-3500 — Integer Overflow or Wraparound vulnerability in Avast Antivirus (25.1.981.6) on Windows allows Privilege…

Avast · Antivirus · Published 1 Dec 2025 · Modified 26 Sept 2026

Description

Integer Overflow or Wraparound vulnerability in Avast Antivirus (25.1.981.6) on Windows allows Privilege Escalation.This issue affects Antivirus: from 25.1.981.6 before 25.3.

References

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

What to do

Check whether Antivirus is in your asset inventory.
Patch in the next maintenance window; prioritise internet-facing systems.
Record the decision in your risk register for audit evidence.

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Link: adminadda.com/cve/CVE-2025-3500