BaseFortify

Publication date: 2025-12-01

Last updated on: 2026-02-06

Assigner: NortonLifeLock Inc.

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-12-01

Last Modified

2026-02-06

Generated

2026-07-06

AI Q&A

2025-12-01

EPSS Evaluated

2026-07-05

NVD

CVE-2025-3500

Affected Vendors & Products

Vendor	Product	Version / Range
avast	antivirus	From 25.1.981.6 (inc) to 25.3 (inc)
avast	antivirus	25.1.981.6

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Attack-Flow Graph

Executive Summary

This vulnerability is an Integer Overflow or Wraparound issue in Avast Antivirus versions from 25.1.981.6 before 25.3 on Windows. It allows a user to escalate their privileges, potentially gaining higher access rights than intended.

Impact Analysis

The vulnerability can lead to privilege escalation, meaning an attacker or malicious user could gain elevated permissions on the affected system. This could allow them to execute unauthorized actions, compromise system integrity, and access sensitive data.

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