CVE-2025-3500 CRITICAL

CVE-2025-3500: Integer Overflow in Avast Antiviurs 25.1.981.6 on Windows may result in privilege escalation

Vendor Avast
Product Antivirus
Weakness CWE-190
Published December 1, 2025
Last update February 26, 2026
View on NVD All CVEs

CVSS base score

9.0/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

December 1, 2025 CVE published
February 26, 2026 Record updated