---
id: CVE-2025-3500
title: >-
  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.
summary: >-
  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.
severity: critical
cvss: 9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H'
cwe:
  - CWE-190
vendor: avast
product: antivirus
affected:
  - 'antivirus >= 25.1.981.6, < 25.3'
patched:
  - antivirus 25.3
published: '2025-12-01'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-3500'
references:
  - url: 'https://www.gendigital.com/us/en/contact-us/security-advisories/'
    label: security@nortonlifelock.com
tags:
  - nvd
  - exploit-available
epss: 0.00459
epssPercentile: 0.37119
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/chicken3962/CVE-2025-3500-Poc'
  checkedAt: '2026-09-26T00:23:14.516Z'
exploitAvailable: true
ingestedAt: '2026-09-26T00:22:39.983Z'
---

## Overview

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.

## Affected

- `antivirus >= 25.1.981.6, < 25.3`

## Remediation

Upgrade past the affected range:

- `antivirus 25.3`